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Welding and thermal cutting — Fundamentals

This aiMOOC is the Fundamentals module of Welding and thermal cutting. It is designed for vocational learners in Blacksmithing, Artistic metalwork, forge work, fabrication and related craft-metal settings. You will learn how practitioners describe common welding and thermal-cutting processes, how heat changes metal, how to plan work, how to recognise basic quality features, and how to control the main risks.

Supervision rule: This course does not authorise you to weld, light an oxy-fuel blowpipe, operate a plasma cutter, connect cylinders, change machine settings, enter a confined space, or perform hot work without the supervision and permission required by your training centre or workplace. Practical work must follow the approved risk assessment, method statement, hot-work controls, equipment manual and instructor or employer instructions.

MOOCwiki Metadata

Field	Course metadata
Exact title	Welding and thermal cutting — Fundamentals
Course family	Welding and thermal cutting
Module	Fundamentals
Target language	English
Primary learners	Vocational learners in blacksmithing and artistic metalwork
Selected jurisdiction	United Kingdom, with Great Britain, Northern Ireland and England-specific statements kept explicitly separate
Standards authority	British Standards Institution, abbreviated BSI
Main safety authorities	Health and Safety Executive for Great Britain and Health and Safety Executive for Northern Ireland
Vocational pathway example	England only: Skills England Blacksmith apprenticeship standard ST0378 version 1.1
Source check date	1 September 2026
Course licence	Original course text is released under Creative Commons Attribution-ShareAlike 4.0; external media retain their own licences
Review status	Ready for review by a competent welding or fabrication instructor and the local health and safety lead

Introduction

Welding joins materials by creating a permanent bond. In the processes most relevant to a blacksmith or artistic metalworker, the joint is usually produced by melting the parent metal and often adding filler metal. Thermal cutting uses concentrated heat to separate metal. Both families of processes are useful for gates, railings, sculpture armatures, brackets, frames, furniture, repair work and the fabrication that supports forged components.

A craftsperson chooses a process for a reason. A neat TIG joint on a thin decorative stainless component solves a different problem from a fast MAG fillet weld on a mild-steel frame, an MMA repair outdoors, an oxy-fuel cut in thick carbon steel, or a plasma cut around a complex profile. Good practice therefore begins with the design, material, joint, process, quality requirement and risk assessment rather than with the machine.

The words used in this module match common UK vocational and workshop practice: MMA, MIG, MAG, TIG, oxy-fuel, plasma cutting, parent metal, weld pool, heat-affected zone, work return, tack weld, fillet weld, butt weld, root, toe, kerf and dross.

Jurisdiction and Precedence

Chosen jurisdiction: United Kingdom. The United Kingdom does not have one single vocational-training system, and occupational-safety law is not administered identically in Great Britain and Northern Ireland. This course therefore keeps the scope of each legal or training statement explicit.

Great Britain — England, Scotland and Wales: Health and Safety Executive guidance is used for welding-fume control, hot-work hazards, compressed gases and related safety duties. Great Britain references in this module include the Health and Safety at Work etc. Act 1974, the Control of Substances Hazardous to Health Regulations 2002, the Electricity at Work Regulations 1989 and other task-relevant regulations where applicable.

Northern Ireland: Health and Safety Executive for Northern Ireland guidance applies. HSENI identifies welding fume as a serious health risk and refers to the Control of Substances Hazardous to Health Regulations (Northern Ireland) 2003. Great Britain legal references in this course must not be treated as Northern Ireland legal advice.

England — vocational pathway example only: Skills England currently lists the Blacksmith apprenticeship, reference ST0378 version 1.1, as an approved Level 3 standard. It includes the skill area thermal welding and cutting and covers the use of hand-operated thermal equipment, cutting and joining techniques. This does not create an automatic pathway in Scotland, Wales or Northern Ireland.

United Kingdom — standards: BSI is the UK national standards body. Standards named later in this module are examples of current UK-adopted standards relevant to process nomenclature, weld quality, thermal-cut quality and welder qualification.

Official rules and workplace instructions take precedence. A training centre, employer, client specification, welding procedure specification, equipment manufacturer, insurer, competent person or enforcing authority may require controls that are more specific than this course. Never assume that a qualification, certificate, standard or job title transfers automatically to another country.

Learning Outcomes

By the end of this module, you should be able to explain the difference between welding and thermal cutting, identify common UK workshop process names, relate process choice to material and design intent, recognise the main parts of a welding or cutting setup, describe the hierarchy of risk controls, identify common weld and cut imperfections, explain basic quality criteria, plan a supervised demonstration safely, and discuss ways to reduce waste, rework, energy use and unnecessary exposure.

Core Concepts

Fusion, heat and the joint

In a fusion weld, the heat source creates a weld pool. The pool solidifies into weld metal. The area of parent metal that does not melt but is changed by the welding heat is the heat-affected zone, commonly shortened to HAZ. The size and condition of the HAZ depend on material, heat input, joint geometry, travel speed and other process variables.

A weld does more than fill a gap. It must transmit loads, fit the drawing or template, suit the material, control distortion and meet the specified appearance. In artistic metalwork, the visible transition between forged and fabricated elements can also be part of the design language.

Joint forms used in craft metalwork

Common joint forms include butt joints, lap joints, T-joints, corner joints and edge joints. A fillet weld is commonly used where two components meet at roughly a right angle, such as a bracket attached to a frame. A butt weld joins components in approximately the same plane. Preparation may include cleaning, squaring, bevelling, setting a root gap, clamping and tacking.

Good fit-up matters because welding does not automatically correct a poorly measured or badly aligned fabrication. Excessive gaps, unstable tacks or misalignment can cause burn-through, distortion, poor penetration or avoidable finishing work.

Arc welding processes in UK workshop language

MMA — manual metal arc welding: An electric arc burns between a flux-coated consumable electrode and the work. The flux produces shielding and slag. MMA is portable and tolerant of outdoor conditions compared with gas-shielded processes, but it produces slag and generally more fume than TIG.

MIG — metal inert gas welding: A continuously fed wire electrode melts in an arc while an inert shielding gas protects the weld pool. In UK vocational teaching, MIG is normally distinguished from MAG according to shielding-gas behaviour.

MAG — metal active gas welding: A continuously fed wire electrode is used with an active shielding gas or gas mixture. MAG is widely used for fabrication of carbon and low-alloy steels and is a common process for frames, brackets, gates and sculpture armatures.

TIG — tungsten inert gas welding: The arc forms between a non-consumable tungsten electrode and the work. Filler may be added separately. TIG offers precise heat and filler control and is often chosen where appearance or control is important, but it is slower and sensitive to cleanliness and draughts.

The diagram above shows the principle of gas metal arc welding: wire electrode, torch, shielding gas, arc, weld pool and parent metal.

The annotated weld-area diagram helps you identify travel direction, the wire, shielding gas, molten metal, solidified weld metal and the workpiece.

The TIG diagram shows how a non-consumable tungsten electrode, shielding gas and weld pool interact.

The TWI overview above introduces popular arc-welding processes. Treat it as conceptual learning, not as permission to copy a setup without your instructor's approved procedure.

Forge welding is different

Forge welding is highly relevant to blacksmithing but is not the same as arc welding. In forge welding, suitably prepared surfaces are brought to a high forging temperature and consolidated by pressure or hammering. It belongs to the broader family of welding processes but uses different heat sources, preparation methods, quality indicators and risks. This module does not teach a forge-welding procedure.

Thermal Cutting Fundamentals

Thermal cutting separates metal by concentrating heat in a narrow zone. The choice of process depends on material, thickness, edge-quality requirement, access, portability, production rate, downstream finishing and the controls available for fume, radiation, gases, electricity and fire.

Oxy-fuel cutting

Oxy-fuel cutting is especially associated with carbon and low-alloy steels that can be cut by rapid oxidation. A preheat flame raises the steel to ignition temperature and a high-purity cutting-oxygen jet sustains the reaction and removes molten oxides from the kerf. The process is not simply "melting through" the steel.

A typical oxy-fuel station includes oxygen and fuel-gas cylinders, regulators, hoses, non-return and flashback protection as specified, a blowpipe or cutting torch, suitable nozzle, approved cylinder handling arrangements and fire controls. Learners must not connect, set, light, test or shut down gas equipment unless the training centre has authorised and supervised that activity.

The illustration above is useful for identifying parts of a gas-welding station. Always use the exact arrangement, flashback protection, cylinder handling and shutdown method required by your equipment manufacturer and workplace.

This Commons photograph shows oxy-fuel cutting in practice. Notice the direction of sparks and hot material: the hazard zone extends beyond the visible flame.

This ESAB/Victor safety video is included to support discussion of oxy-fuel risk controls. It does not replace site-specific training or manufacturer instructions.

Plasma cutting

Plasma cutting uses an electric arc and a high-velocity jet of ionised gas to cut electrically conductive metal. Hand-held systems are common in fabrication workshops; mechanised CNC systems are used for repeatable profiles. Plasma can cut carbon steel, stainless steel and aluminium, but it introduces electrical, ultraviolet, hot-particle, fume, noise and compressed-air or gas hazards.

This close-up shows a plasma torch cutting plate. The bright arc, ejected metal and plume help explain why eye, skin, fume, fire and bystander controls are essential.

CNC plasma cutting separates process control from hand motion, but it still requires guarding, extraction, fire prevention, correct consumables and competent setup.

The Hypertherm video above shows plasma-cutting applications. Use it to observe process characteristics and edge formation, not to infer settings for an unfamiliar machine.

Authentic Blacksmithing and Artistic Metalwork Examples

Gate frame: A blacksmith may forge scrolls and leaves, then use MAG welding to assemble them to a mild-steel frame. The fabrication must preserve square, flatness, spacing, visual rhythm and any specified load or security requirement.

Sculpture armature: Plasma-cut tabs and MAG-welded tube can form a hidden support structure. The artist still needs to control distortion, sharp edges, internal corrosion traps and the effect of later grinding or surface finishing.

Forged handrail bracket: A forged bracket may be welded to a fabricated mounting plate. If the item is load-bearing or installed in a public setting, drawing, material, weld size, competent fabrication and any applicable structural or building requirements take precedence over purely visual judgement.

Repair of historic ironwork: The first question is not "Which welder should I use?" but "What is the material, significance, failure mechanism and conservation requirement?" Repair may require a conservation specialist, minimal intervention and reversible or compatible methods.

Decorative panel: Thermal cutting can create repeated profiles before forging, scrolling or texturing. Careful nesting reduces scrap; controlled heat input reduces clean-up and distortion.

Tools, Equipment and Materials

Typical welding equipment

Item	Practitioner purpose	Key control point
Welding power source	Supplies controlled welding current and voltage	Use only approved equipment in serviceable condition and with the specified electrical supply
Wire-feed unit and MAG or MIG torch	Feeds wire and delivers shielding gas	Correct consumable, liner, contact tip, nozzle and setup are selected by the approved procedure
MMA electrode holder	Holds the flux-coated electrode	Insulation, cable condition and safe isolation matter
TIG torch	Holds tungsten electrode and directs shielding gas	Torch, tungsten, gas and polarity must match the approved procedure
Work return lead and clamp	Completes the welding circuit	Attach to clean metal in the approved location; do not rely on unsafe current paths
Local exhaust ventilation	Captures fume at source	Position the hood or use on-torch extraction within its effective capture zone
Welding screen or curtain	Protects nearby people from arc radiation and spatter	Screen the whole exposure path and keep access controlled
Welding table, clamps and jigs	Support fit-up and repeatable positioning	Stable support reduces movement, distortion and hand exposure

In workshops, the work return clamp is sometimes called an earth clamp. The technically clearer term is work return because it carries welding current back to the power source; it is not a substitute for protective earthing of electrical equipment.

Typical thermal-cutting equipment

Item	Practitioner purpose	Key control point
Oxy-fuel cutting blowpipe or torch	Preheats and directs the cutting-oxygen jet	Correct nozzle, serviceable valves and manufacturer-approved setup are essential
Oxygen and fuel-gas cylinders	Supply process gases	Identification, secure handling, leak prevention, separation from heat and correct regulators are essential
Regulators and hoses	Reduce cylinder pressure and convey gas	Use equipment suitable for the gas, inspect it and protect it from damage
Flashback protection	Reduces the consequences of reverse flow or flame travel	Fit the protection required by the equipment design and HSE or workplace guidance
Plasma power source and torch	Generates and constricts the plasma arc	Electrical isolation, correct consumables, dry suitable air or gas and safe torch condition matter
Cutting table or slats	Supports plate and allows hot material to fall clear	Control fire, fume, hot drops and unstable offcuts

Materials and consumables

Mild steel is common in blacksmithing and fabrication because it forges readily and is widely weldable when the grade, section and joint are suitable. Stainless steel and aluminium need different consumables, shielding and preparation. Unknown metal should be identified before hot work. Painted, plated, galvanised, oily or otherwise coated material can produce additional hazardous fumes and may require coating removal, special controls or a different process.

Consumables include welding wire, MMA electrodes, TIG filler rod, shielding gases, oxy-fuel gases, plasma electrodes and nozzles, grinding discs, abrasives and cleaning materials. Use the specified consumable and store it to prevent contamination, moisture uptake or damage.

Risk Controls and Safe Working Principles

Start with the hierarchy of control

HSE guidance for welding fume requires risk assessment and effective control. Think in this order: avoid or reduce the hot process where reasonably practicable; reduce the amount of welding; choose a lower-fume method where suitable; use engineering controls such as LEV; add suitable RPE where engineering control does not adequately control exposure; then use task-appropriate PPE and administrative controls. PPE is important, but it is not the first or only control.

Great Britain: HSE states that all welding fume can cause lung cancer and that welding fume is subject to COSHH. Indoor welding normally requires suitable source capture where reasonably practicable. Where LEV alone does not adequately control exposure, suitable RPE is also required. For outdoor welding, HSE states that LEV cannot be relied on and suitable RPE is required.

Northern Ireland: HSENI also states that there is no known safe level of exposure to welding fume and requires suitable exposure-control measures under Northern Ireland law. Do not substitute Great Britain legislation for Northern Ireland legislation.

Fume, gases and breathing zone

Keep your head out of the fume plume and arrange extraction so fume moves away from your breathing zone. Movable LEV only works when the hood stays within its effective capture zone. General ventilation supports control but is not a substitute for source capture where source capture is required.

RPE must be selected from the risk assessment and be compatible with the welding visor and other PPE. Tight-fitting RPE requires face-fit testing and a suitable facial seal. Powered air or supplied-air welding protection may be selected where appropriate. Particulate filters do not remove every gas that can be present in welding fume.

Do not weld or cut unknown coatings. Galvanised, painted, solvent-contaminated or plated surfaces may change the fume hazard significantly. Clean and prepare material using an approved method before hot work.

Arc radiation, burns and hot metal

Arc welding and plasma cutting produce intense ultraviolet and visible radiation. Use a suitable welding or cutting filter, face and eye protection, flame-resistant clothing, gloves and screens. Protect bystanders and people on the other side of openings. Arc-eye can develop after exposure, so "I only looked for a moment" is not a safe rule.

Mark hot workpieces and place them in a designated safe location. Metal that looks cold may still cause a serious burn. Keep gloves dry and in good condition, and do not handle sharp or hot offcuts casually.

Fire and explosion

Remove combustible materials, check both sides of walls and partitions, protect openings and provide suitable fire-fighting arrangements in line with the site plan. HSE advises a fire watch during and after hot work where risk remains; after completion the watch should normally continue for at least 30 minutes and may need to extend to 60 minutes where ignition would be difficult to detect or slow to develop.

Never apply welding or flame-cutting heat to a drum, tank or container that has contained or may have contained flammable material unless a competent, formal system has established that the work is safe. HSE warns that apparently empty containers can retain enough residue to explode. For learners, such work is outside this module.

Electricity

Arc-welding and plasma systems can cause electric shock, burns and fire. Inspect leads, plugs, torch, electrode holder and return connections before use. Keep equipment dry where required, isolate before maintenance or consumable changes as specified, and never improvise repairs. Confined, wet or conductive locations can make electrical risk much more severe and require specialist assessment.

Compressed gases and oxy-fuel systems

Cylinders contain stored energy and must be identified, secured, handled and connected correctly. Protect cylinders, valves, regulators and hoses from impact, contamination, heat and damage. Oxygen dramatically increases fire intensity and must never be used as a substitute for compressed air to blow dust from clothing or to ventilate a workspace.

HSE guidance on gas welding and cutting addresses non-return valves, flashback arresters, hose condition, leak checks, cylinder positioning, fire and confined spaces. Follow the exact equipment and site procedure; do not invent a generic lighting or shutdown sequence from memory.

Confined spaces and oxygen displacement

Shielding gases can displace air. Gas welding and cutting can also alter the atmosphere. Confined-space welding or cutting therefore requires a specific assessment, permit or safe system, ventilation, atmospheric controls and rescue arrangements as applicable. Learners must not enter a confined space for welding or cutting merely because they have completed this module.

Noise, grinding and manual handling

Fabrication usually combines welding or cutting with grinding, chipping, drilling and material handling. Control noise at source, use suitable hearing protection where required, manage vibration exposure from tools, clamp work securely and use lifting aids or team handling for awkward stock and fabrications. Sharp plate edges and cut drops need the same attention as hot metal.

Supervised Step-by-Step Demonstration

Demonstration A: MAG fillet weld on clean mild-steel coupons

This is an instructor-led demonstration. The instructor controls energising, gas connection, wire selection, polarity, machine settings and any test run according to the approved workshop procedure, manufacturer instructions and training specification. The learner does not guess voltage, wire-feed speed, gas flow or RPE requirements.

Confirm authority to proceed: Review the job sheet, risk assessment, emergency arrangements, extraction, screens and supervision boundary before touching the welding plant.
Identify the material and joint: Confirm clean mild-steel coupons and a T-joint or lap arrangement suitable for a fillet-weld exercise.
Prepare the surfaces: Remove contamination from the weld zone with the approved method and keep flammable solvent residues away from hot work.
Set and clamp the joint: Check angle, gap and alignment against the drawing or training sample, then clamp securely on the welding table.
Check controls: Verify LEV operation, screen position, safe cable routing, work return connection and PPE before the arc is enabled.
Instructor sets the process: The instructor selects the MAG wire, shielding gas and machine parameters from the centre procedure or equipment data and confirms a stable trial condition.
Place tack welds under direct supervision: Use small, correctly placed tacks to hold alignment, then re-check squareness and distortion before the main run.
Run the fillet weld under direct supervision: Maintain the taught torch work angle, travel angle, arc length and steady travel speed while keeping the fume away from the breathing zone and within extraction control.
Stop safely: Release the trigger, allow the arc to extinguish, keep the torch clear, and follow the approved isolation or standby procedure.
Allow controlled cooling: Treat the work as hot, mark or place it safely, and do not quench unless the procedure specifically requires it.
Clean for inspection: Remove loose spatter or contamination only by an approved method and with the required PPE.
Inspect and record: Check size, continuity, profile, tie-in at the toes, start and stop, visible porosity, undercut, distortion and overall appearance against the training criterion.

Use the diagram above to identify wire, shielding gas, nozzle, arc, molten metal and parent material before the practical demonstration begins.

Demonstration B: supervised observation of a straight thermal cut

The purpose is to understand setup logic and quality, not to memorise a hazardous operating sequence.

Read the cut requirement: Identify material, thickness, cut line, required edge condition and allowance for kerf.
Select the authorised process: The instructor confirms whether oxy-fuel or plasma is suitable for the known material and the available controls.
Establish the hazard zone: Remove combustibles, control bystanders, arrange extraction or ventilation, protect surfaces below and plan for hot offcuts.
Inspect the system: The instructor completes equipment-specific pre-use checks, including hoses and gas equipment for oxy-fuel or electrical leads, torch and consumables for plasma.
Set process conditions: Only the competent instructor sets gas pressures, nozzle or consumable, current, air or gas supply and travel condition from approved data.
Align and support the work: Clamp plate securely, ensure the drop cannot injure anyone and provide a clear path for sparks and molten material.
Make the cut under supervision: Observe torch-to-work relationship, direction of travel, sound, spark stream and the developing kerf without placing yourself in the exposure path.
Shut down by the approved procedure: The instructor follows the equipment-specific stop, isolation and gas-cylinder procedure.
Control hot material: Move or mark offcuts only with appropriate tools and PPE, and continue the required fire watch.
Inspect the edge: Look for squareness, drag or striation pattern, dross, excessive melting, roughness, bevel, kerf consistency and heat-related distortion.

Common Errors, Causes and Safer Corrections

Symptom	Likely contributors	Safer response
Porosity in a gas-shielded weld	Contamination, draught, poor gas coverage, damaged nozzle or incorrect setup	Stop, inspect cleanliness and shielding arrangement, then consult the procedure or instructor before changing settings
Undercut at the weld toe	Excessive heat, travel speed, arc length or poor torch angle	Review technique and approved parameters; do not simply add more weld metal without diagnosis
Lack of fusion	Inadequate heat input, poor joint preparation, incorrect angle or travel condition	Stop and review preparation, access, sequence and approved settings with the instructor
Excessive spatter	Unstable arc, poor settings, contamination or shielding problem	Check setup and cleanliness instead of accepting grinding as the normal cure
Distortion	Uneven heat input, weak restraint, poor sequence or excessive weld size	Re-plan tacking, sequence, restraint and weld size before continuing
Slag inclusion in MMA	Poor slag removal, poor angle or incorrect bead placement	Stop, clean fully between runs and review technique
Rough plasma-cut edge	Worn consumables, poor torch distance, unsuitable speed or unstable air or gas supply	Isolate as required, inspect consumables and follow approved machine data
Heavy oxy-fuel dross	Unsuitable speed, nozzle condition, oxygen condition, poor preheat or incorrect stand-off	Stop and let the competent operator check the full setup rather than compensating by guesswork
Cut wanders from the mark	Poor support, unstable hand motion, worn guide or unclear layout	Improve layout, guidance and support before remaking the cut

Quality Criteria

A good result is not defined only by whether two pieces remain attached. Quality begins with the drawing, specification, client requirement or training sample.

For welded work, inspect: correct joint and weld location; correct weld size; sound start and stop; consistent profile; acceptable toe transition; absence of visible cracks; controlled undercut; acceptable porosity; no obvious lack of fusion; suitable penetration where required; acceptable distortion; clean surrounding surface; and dimensional conformity.

For thermal cuts, inspect: line accuracy; kerf consistency; edge squareness or intended bevel; surface roughness; drag or striation pattern; amount and adhesion of dross; top-edge rounding; heat distortion; and the allowance left for grinding, machining or forging.

UK standard examples: BS EN ISO 5817:2023 gives quality levels for imperfections in fusion-welded joints in steel, nickel, titanium and their alloys. BS EN ISO 9013:2017+A1:2024 addresses geometrical product specification and quality tolerances for thermal cuts. These standards apply when the drawing, contract, procedure or quality system invokes them; this course does not claim that every decorative blacksmithing job must use them.

A visually smooth weld can still be unsound, and a structurally acceptable weld can still be unsuitable for a visible artistic surface. The acceptance criterion must therefore be agreed before work starts.

Sustainability and Resource Efficiency

Design for efficient fabrication: Use stock sizes, joints and sequences that minimise unnecessary weld length, cut length and grinding.

Nest profiles: Arrange plasma or oxy-fuel cut parts to reduce offcut area while preserving safe bridges, edge distances and heat control.

Reduce rework: Accurate marking out, fit-up, tacking and trial assemblies save filler wire, gas, abrasives, energy and labour.

Segregate scrap: Keep clean steel, stainless and aluminium streams separate where the workshop recycling system requires it.

Control leaks: Gas leaks waste resources and can create serious hazards. Report damaged hoses, fittings or cylinders rather than treating leakage as normal.

Use extraction efficiently: Capture fume at source with correctly positioned and maintained LEV rather than relying on excessive whole-shop air movement alone.

Choose repair where appropriate: Repairable forged or fabricated objects can extend material life, but repair should not compromise safety, heritage significance or required performance.

Avoid over-finishing: Grinding a sound weld flat for no functional or visual reason wastes energy, abrasives and metal and can reduce section thickness.

Plan finishes early: Galvanising, paint, wax, oil, powder coating or other finishes may influence vent holes, drainage, weld access and surface preparation. Design these features before final assembly.

Inclusive Workshop Learning

A safe training environment should not assume that every learner has the same reach, strength, vision, hearing, respiratory fit, hand size or prior workshop experience. Adjustable benches, positioners, handling aids, clear floor routes, task lighting, suitable glove and PPE sizes, captioned videos, written demonstrations and verbal briefings can widen access.

Tight-fitting RPE cannot be treated as a one-size-fits-all item; face-fit requirements and facial hair can affect selection. Where powered-air equipment or another solution is appropriate, the employer or training centre should make that decision through the risk assessment and RPE programme.

Professional teamwork includes asking for help with an awkward fabrication, using a jig instead of holding hot material by hand, and stopping when instructions are unclear. Competence includes knowing when not to proceed.

Qualifications, Standards and Certification in the Selected Jurisdiction

England: blacksmith apprenticeship example

Skills England lists Blacksmith, reference ST0378 version 1.1 as a Level 3 apprenticeship standard approved for delivery. The occupational profile covers hot forging and other metalworking for bespoke, heritage, architectural and artistic work. Its skills include thermal welding and cutting with hand-operated thermal equipment.

This aiMOOC can support knowledge development, but completion of the course is not the apprenticeship, not an end-point assessment and not a licence to carry out unsupervised hot work.

England, Wales and Scotland: separate welding qualification example

City & Guilds lists the Welding Skills 3268 qualification family at Levels 1, 2 and 3, including introductory welding, fabrication and thermal-cutting content. Availability, registration dates, unit combinations, funding and centre approval change over time, so learners and centres must check the current qualification handbook and registration status rather than relying on this course.

United Kingdom: standards examples

BS EN ISO 4063:2023 provides nomenclature and reference numbers for welding, brazing, soldering and thermal-cutting processes.

BS EN ISO 5817:2023 gives quality levels for imperfections in fusion-welded joints in specified metallic materials.

BS EN ISO 9013:2017+A1:2024 addresses classification and quality tolerances for thermal cuts.

BS EN ISO 9606-1:2017 is current at BSI for qualification testing of welders for fusion welding of steels.

A welder qualification under BS EN ISO 9606-1 is a specific test with defined ranges and conditions. It is not created by watching a video, passing this quiz, completing a general college course or holding an unrelated certificate. Employers, clients, inspection bodies and sector rules may require different or additional evidence.

No automatic cross-country equivalence is claimed. If you work or study outside the United Kingdom, use the competent authority, training framework and standards adopted in that country.

Glossary

Term	Meaning in this module
Arc	An electrical discharge that provides intense heat between electrode and work
Parent metal	The metal being joined or cut; also called base metal in some sources
Weld pool	The local volume of molten metal created during fusion welding
HAZ	Heat-affected zone, where parent metal is thermally altered without melting
Filler metal	Metal added to form part of the completed weld
Electrode	A conductor that carries welding current; it may be consumable or non-consumable
MMA	Manual metal arc welding using a flux-coated consumable electrode
MIG	Metal inert gas welding using continuously fed wire and inert shielding gas
MAG	Metal active gas welding using continuously fed wire and active shielding gas or mixture
TIG	Tungsten inert gas welding using a non-consumable tungsten electrode
Fillet weld	A weld of approximately triangular cross-section joining surfaces that meet at an angle
Butt weld	A weld joining two components lying approximately in the same plane
Root	The deepest part of a weld joint or the region opposite the weld face
Toe	The junction between the weld face and parent metal
Tack weld	A short weld used to hold parts in alignment before final welding
Penetration	The extent to which fusion reaches into the joint
Fusion	Melting and joining between weld metal and parent metal or previous weld metal
Porosity	Gas cavities trapped in solidified weld metal
Undercut	A groove melted into the parent metal at a weld toe and not adequately filled
Distortion	Unwanted change of shape caused by uneven heating and cooling
Kerf	The width of material removed by a cutting process
Dross	Resolidified material adhering to the lower edge of a thermal cut
LEV	Local exhaust ventilation used to capture airborne contaminants near their source
RPE	Respiratory protective equipment selected as part of exposure control
Work return	The welding-current path from the workpiece back to the power source
Flashback	Flame travelling back into oxy-fuel equipment, potentially causing serious damage or explosion
Hot work	Work involving flame, heat or sparks that can create fire or explosion hazards

Reflection and Professional Judgement

Consider a decorative gate that combines forged scrolls with a fabricated rectangular frame. Which joints should remain visible as part of the craft aesthetic, and which should be blended or concealed? How would your answer change if the gate also had a structural or security function?

Consider a plasma-cut sculpture panel with visible dross and heat distortion. Which defects are technical quality problems, which may be intentional artistic effects, and which still create safety or fit-up problems regardless of artistic intent?

Consider a small repair where welding would be quick but would generate fume and damage an existing finish. What cold joining, replacement or redesign options could reduce exposure and rework?

Authoritative Sources and Expert Review Notes

The following sources were checked for this version. They should be re-checked before delivery if rules, standards, qualification status or equipment change.

Health and Safety Executive, Great Britain — Welding fume: protect your workers: Current overview of health risk and control duties.
Health and Safety Executive, Great Britain — Controlling the risks from welding: Current guidance on LEV, RPE and protection of others.
Health and Safety Executive, Great Britain — Safety risks from welding: Fire, explosion and related hazards.
Health and Safety Executive, Great Britain — Safety in gas welding, cutting and similar processes: Practical gas-process precautions.
Health and Safety Executive, Great Britain — The safe use of compressed gases in welding, flame cutting and allied processes: Detailed compressed-gas guidance.
Health and Safety Executive for Northern Ireland — Welding fume: Northern Ireland-specific welding-fume control information.
Skills England — Blacksmith ST0378 version 1.1: Current England apprenticeship standard and thermal welding and cutting skill.
City & Guilds — Welding Skills 3268: Current qualification-family information; centres must verify unit availability and dates.
BSI — BS EN ISO 4063:2023: Process nomenclature and reference numbers.
BSI — BS EN ISO 5817:2023: Weld-imperfection quality levels.
BSI — BS EN ISO 9013:2017+A1:2024: Thermal-cut geometrical quality.
BSI — BS EN ISO 9606-1:2017: Welder qualification testing for fusion welding of steels.

Expert-review checklist: Confirm jurisdiction labels; confirm workshop-specific COSHH and fire arrangements; verify current RPE and LEV selection; verify the exact welding and cutting plant manuals; confirm cylinder-gas procedures; confirm qualification and standards editions; confirm whether any example could be mistaken for unsupervised instruction; and review artistic-metalwork examples for local professional practice.

Media and Open-Licence Notes

The original text of this aiMOOC is released under CC BY-SA 4.0. Wikimedia Commons files embedded in this course are reused under the licence shown on each Commons file page; attribution and share-alike terms must be followed where applicable. YouTube videos are external embeds and are not re-licensed by this course.

The selected Commons media include technical diagrams and real workshop imagery so that learners can connect vocabulary to equipment, arc behaviour, hot metal and cut geometry. The selected YouTube videos come from TWI, ESAB/Victor and Hypertherm sources and are used as supplementary observation material. None of the videos overrides UK rules, the workplace risk assessment, the equipment manual or direct instruction.

Interactive Tasks

Quiz: Test Your Knowledge

What does HAZ mean in welding terminology? (Heat affected zone) (!High arc zero) (!Hot air zone) (!Heat alignment zone)

Which process name is commonly used in the UK for flux coated electrode arc welding? (MMA) (!MAG) (!TIG) (!Plasma)

What is the main purpose of LEV during welding? (Capture fume close to its source) (!Increase arc voltage) (!Cool the parent metal rapidly) (!Measure weld size)

Which statement about welding fume matches current Great Britain HSE guidance? (All welding fume requires suitable exposure control) (!Mild steel fume needs no control) (!Outdoor welding needs no respiratory protection) (!Short jobs never require controls)

What is a kerf? (The width of material removed by cutting) (!A welding helmet filter) (!A type of shielding gas) (!A forge hammer face)

Which item completes the welding current path from the workpiece to the power source? (Work return lead) (!Gas regulator) (!Flashback arrester) (!Welding screen)

What should happen before hot work on an unknown drum or tank? (A competent safe system must establish that the work is safe) (!The container should be assumed empty) (!The flame should be made smaller) (!The work should be done outdoors without assessment)

Which feature is normally checked when inspecting a thermal cut? (Edge squareness) (!Electrode coating colour) (!Hammer rebound) (!Anvil face hardness)

Which England vocational standard includes thermal welding and cutting for blacksmiths? (Blacksmith ST0378) (!Electrician ST0152) (!Carpenter ST0264) (!Bricklayer ST0095)

What does completion of this aiMOOC provide? (Fundamental learning evidence only) (!Automatic welder qualification) (!Permission for unsupervised hot work) (!Automatic international certification)

Memory Game

HeatAffectedZone	Parent metal changed by welding heat without melting
WeldPool	Local molten metal formed during fusion welding
LocalExhaust	Source capture used to remove fume
KerfWidth	Material width removed by the cutting process
TackWeld	Short weld used to hold alignment before final welding
CutDross	Resolidified material attached to a thermal cut edge

Drag and Drop

Match the correct terms.	Welding and cutting concept
Manual metal arc	Flux coated consumable electrode
Metal active gas	Continuously fed wire with active shielding gas
Tungsten inert gas	Non consumable tungsten electrode
Oxy fuel cutting	Preheat flame and cutting oxygen jet
Plasma cutting	Ionised gas jet and electric arc

...

Crossword Puzzle

Porosity	What one-word term describes gas cavities trapped in a weld?
Undercut	What one-word term describes a groove at the weld toe that is not filled?
Extraction	What one-word term describes removing welding fume at source?
Electrode	What one-word term names the conductor that carries welding current into the arc?
Flashback	What one-word term describes flame travelling back into oxy-fuel equipment?
Distortion	What one-word term describes unwanted shape change after uneven heating and cooling?

LearningApps

Cloze Text

In fusion welding, molten metal forms a

before it solidifies. The parent metal beside the fusion zone may become a

without melting. UK workshops commonly call flux coated electrode welding

. Gas metal arc welding on carbon steel commonly uses the active-gas process called

. Source capture of welding fume is provided by

. The width removed by a thermal cutting process is the

. Resolidified material on the lower edge of a thermal cut is called

. A short weld used to hold components in position before final welding is a

.

Open-Ended Tasks

Easy

Process vocabulary poster: Create an illustrated English poster that explains ten workshop terms from this module and distinguishes MMA, MIG, MAG and TIG without giving machine settings.
Joint identification sketch: Draw five joint forms used in artistic metalwork and label where a fillet weld or butt weld could appear in a supervised fabrication exercise.
Workshop risk map: On a plan of a training bay, mark the welding area, extraction, screens, hot-metal zone, cylinder area, fire equipment and safe pedestrian route, then explain your choices.
Video observation notes: Watch one embedded process video and write what you can observe about heat source, consumable, shielding, hot particles, fume and bystander controls without attempting to copy the procedure.

Standard

Blacksmith interview: Interview a practising blacksmith, welder or fabrication instructor about when they choose forging, mechanical fastening, MAG welding, MMA welding or thermal cutting, and summarise the decision factors.
Quality comparison board: With instructor-provided photographs or inactive samples, compare acceptable and unacceptable weld profiles, porosity, undercut, dross, distortion and cut squareness and justify your classification.
Sustainable fabrication plan: Design a small decorative steel panel and show how stock selection, nesting, joint design, weld length and finishing choices reduce waste and rework.
Supervised demonstration storyboard: Produce a step-by-step storyboard for the instructor-led MAG fillet-weld demonstration, showing controls, checkpoints and quality inspection but no guessed machine settings.

Advanced

Procedure review exercise: Given an instructor-supplied drawing and welding procedure, identify the material, joint, process, consumable, position, quality checkpoints and safety controls, then list questions that must be resolved before work starts.
Thermal cut experiment under supervision: Under direct instructor control, compare inactive cut samples made at different approved conditions and analyse kerf, dross, drag lines, edge angle and distortion without independently changing machine settings.
Artistic metalwork fabrication proposal: Develop a professional proposal for a forged and fabricated gate or sculpture that integrates design intent, process selection, risk control, quality criteria, finishing, installation and maintenance.
Expert review video: Produce a short captioned video in which a competent instructor critiques a welded or thermally cut training sample, with explicit discussion of what cannot be judged visually and why workplace rules take precedence.

Learning Assessment

Process selection assessment: Compare MAG, MMA, TIG, oxy-fuel cutting and plasma cutting for three blacksmithing or artistic-metalwork scenarios, justify the best process for each and identify one reason not to choose each alternative.
Risk control assessment: Given a workshop scenario with visible welding fume, poor screening and nearby combustibles, propose controls in hierarchy order and explain which actions address source, path and person.
Quality transfer assessment: Analyse a photographed fillet weld and a thermal-cut edge against an instructor-supplied acceptance sheet, separating visible evidence from conclusions that would require further testing.
Distortion problem assessment: A fabricated frame pulls out of square after welding; explain likely thermal causes and propose a revised fit-up, tacking, sequencing and restraint plan that reduces the risk without creating unsafe locked-in stresses.
Jurisdiction assessment: Explain why Great Britain HSE rules, Northern Ireland HSENI rules, the England apprenticeship pathway and UK BSI standards must not be merged into one undifferentiated statement.
Sustainability assessment: Redesign a decorative panel workflow to reduce cut scrap, weld length, grinding, gas use and rework while keeping the required appearance and function.
Professional judgement assessment: Decide whether a learner should proceed, stop or seek competent advice in five instructor-supplied scenarios involving unknown coatings, damaged leads, a confined space, a client-critical structural joint and a hot offcut.

Evidence of Learning

Important evidence includes knowledge of process principles and UK terminology; correct identification of hazards and controls; ability to interpret a drawing, joint and work instruction; safe planning of a supervised task; reasoned process selection; accurate observation of weld and cut quality; understanding of the limits of visual inspection; correct use of jurisdiction labels; awareness that this aiMOOC is not a licence or welder qualification; a completed risk map or storyboard; quality-comparison records; a sustainability proposal; reflective notes; and transfer of the same reasoning to a new blacksmithing or artistic-metalwork problem.

A practical learner portfolio may contain instructor-signed observation sheets, photographs of approved training samples, inspection records, sketches, process-selection justifications and feedback. Evidence should never reward unsafe speed or unsupervised experimentation.