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Welding and thermal cutting — Tools and materials

Introduction

Welding and thermal cutting — Tools and materials is a vocational learning module for learners in Blacksmithing, Artistic metalwork, metal fabrication, restoration, and related craft occupations. It focuses on recognising, selecting, checking, and using welding and thermal-cutting tools and materials within a controlled workshop system.

Jurisdiction used in this module: United Kingdom. Safety guidance is based primarily on the Health and Safety Executive for Great Britain. The vocational apprenticeship example is explicitly labelled England only. British Standards Institution references are identified as UK standards references. Northern Ireland has its own workplace-safety authority and legal arrangements, so Great Britain guidance must not be assumed to apply there unchanged.

Official rules, employer procedures, risk assessments, COSHH assessments, manufacturer instructions, welding procedure specifications, permits to work, and instructions from a competent supervisor always take precedence over this learning resource. This course does not authorise unsupervised hot work, gas-system adjustment, live electrical work, confined-space entry, or any activity for which you have not been trained, assessed, and permitted.

Course metadata	Information
Module	Tools and materials
Parent topic	Welding and thermal cutting
Target learners	Vocational learners in blacksmithing, artistic metalwork, fabrication, and heritage metalwork
Language	English
Jurisdiction	United Kingdom, with Great Britain HSE safety guidance and an England-only apprenticeship example
Learning level	Introductory to intermediate vocational education
Practical-work condition	Supervised workshop learning only
Review status	Ready for review by a competent welding, fabrication, blacksmithing, and occupational-safety expert before practical delivery
Open-education status	Original course text may be reused under the applicable MOOCwiki open licence; externally hosted media retain their own licences
Source review date	1 September 2026

Learning Outcomes

By the end of this module, you should be able to:

Welding process selection: Distinguish common welding and thermal-cutting processes by their tools, consumables, shielding systems, and typical craft applications.
Workshop equipment: Identify the main parts of welding, gas, extraction, workholding, and cutting equipment without bypassing safety controls.
Engineering materials: Match common metals and consumables to an appropriate process while recognising when material identity, coating, or condition is uncertain.
Risk control: Explain how elimination, substitution, engineering controls, safe systems of work, and personal protective equipment combine to reduce welding and cutting risks.
Quality control: Inspect cooled work for visible features that indicate sound preparation, acceptable profile, dimensional accuracy, and possible defects.
Sustainable fabrication: Reduce waste, rework, gas loss, consumable loss, energy use, and avoidable damage to heritage material.

Core Concepts

Welding, Cutting, and Allied Processes

Welding joins materials by producing coalescence, usually with heat and sometimes pressure or filler material. In blacksmithing and artistic metalwork, welding may be used to build frames, attach brackets, assemble sculptural elements, repair components, or combine forged parts.

Thermal cutting separates material by concentrated heat. Common workshop methods include Oxy-fuel cutting and Plasma cutting. Thermal cutting is not simply “hot sawing”: the energy source, chemistry, electrical conductivity, kerf, heat-affected zone, edge condition, and fume generation all matter.

Common UK workshop terminology includes:

MMA: Manual metal arc welding using a consumable flux-coated electrode. The American term SMAW is also encountered in technical literature.
MIG/MAG: Wire-fed gas-shielded arc welding. MIG uses an inert shielding gas; MAG uses an active shielding gas. In informal workshop speech, “MIG” is sometimes used loosely for both, but precise vocational language distinguishes them.
TIG: Tungsten inert gas welding using a non-consumable tungsten electrode. The American term GTAW is also encountered.
FCAW: Wire-fed arc welding using tubular flux-cored wire, with or without external shielding gas depending on the wire system.
Oxy-fuel cutting: Thermal cutting in which fuel gas provides preheat and oxygen supports rapid oxidation of suitable ferrous material.
Plasma cutting: Thermal cutting using a constricted plasma arc on electrically conductive material.

Process	Main equipment	Typical consumables or process media	Typical blacksmithing or artistic-metalwork use
MMA	Welding power source, electrode holder, work-return lead, extraction	Covered electrodes	Repair, site work, heavier steelwork, short runs
MIG/MAG	Constant-voltage power source, wire feeder, torch, work-return lead, shielding-gas system, extraction	Solid or metal-cored wire and suitable shielding gas	Gates, frames, sculpture armatures, repetitive fabrication
TIG	TIG power source, torch, work-return lead, shielding-gas system, extraction	Tungsten electrode, separate filler rod where required, inert shielding gas	Fine work, visible joints, stainless steel, aluminium, controlled repair work
FCAW	Suitable wire-feed power source, torch, work-return lead, extraction	Flux-cored wire, sometimes shielding gas	Structural fabrication, thicker sections, outdoor or production work where the approved wire system suits the task
Oxy-fuel cutting	Oxygen and fuel-gas cylinders or approved supply, regulators, hoses, flashback protection, cutting torch, extraction or ventilation controls	Oxygen, approved fuel gas, torch consumable parts	Cutting suitable carbon steel sections, cropping stock, rough profiling before forging or fabrication
Plasma cutting	Plasma power source, torch, work-return lead, compressed gas or approved process-gas supply, extraction	Electrodes, nozzles and other torch consumables	Profiles, decorative panels, sheet and plate, conductive non-ferrous metals where the machine is suitable

Workshop reading task: Look at the image above without operating any equipment. Identify the torch, workpiece, arc region, operator protection, and likely direction of travel. Then compare your observations with the labelled process diagram below.

The video provides an overview of popular arc-welding processes. Use it to compare process principles, not as a substitute for supervised practical instruction.

Welding and Cutting Equipment

A competent fabricator does not treat the welding set as a single object. The complete work system includes power or gas supply, process controls, leads or hoses, torch or holder, work return, consumables, extraction, guarding, screens, workholding, measuring tools, and suitable PPE.

Tool or component	Function	What you should check before supervised use
Welding power source	Supplies controlled electrical energy for the selected arc process	Correct process, identification, visible condition, inspection status, cables, connectors, controls
Electrode holder	Holds a covered electrode in MMA	Insulation, jaw condition, secure connection, absence of obvious damage
MIG/MAG torch	Guides wire, shielding gas, and welding current to the joint	Liner and consumable condition, trigger, cable assembly, nozzle condition, manufacturer-approved setup
TIG torch	Holds the tungsten electrode and delivers shielding gas	Torch body, collet system, cup, electrode condition, cable and hose condition
Work-return lead and clamp	Completes the welding circuit	Secure connection, sound cable insulation, clean and suitable contact point
Wire feeder	Advances wire at a controlled rate	Correct wire path and rolls, cover closed, no obvious bird-nesting or contamination
Gas regulator and flow-control equipment	Reduces cylinder pressure and controls gas delivery	Correct gas service, identification, physical condition, approved connections, no oil or grease on oxygen equipment
Flashback protection	Helps protect oxy-fuel systems against dangerous reverse flame or gas flow	Correct approved type, correct placement according to the risk assessment and manufacturer guidance, serviceable condition
Local exhaust ventilation	Captures welding or cutting fume near the source	Hood position, airflow indication where fitted, visible damage, current examination and test status
Welding screen	Protects nearby people from arc radiation and spatter	Complete coverage without creating an unsafe obstruction or blocking required ventilation
Welding table	Provides a stable work surface and connection point where designed for that purpose	Stability, cleanliness, fire-resistant surroundings, suitable load capacity
Clamps and jigs	Hold parts in alignment during fit-up and controlled welding	Capacity, condition, correct positioning, no interference with torch travel or escape routes

Materials and Consumables

Process selection begins with reliable identification of the base material. Colour, magnet response, sparks, weight, or surface appearance can provide clues, but they do not always prove an alloy grade. For safety-critical, heritage, coated, or unknown components, use approved identification methods and escalate uncertainty.

Material or consumable	Practical significance	Typical caution
Mild and low-carbon steel	Common in gates, frames, brackets, sculpture, and general fabrication	Surface coatings, paint, rust, oil, galvanizing, or unknown contamination can change fume and weld quality
Stainless steel	Used where corrosion resistance or appearance matters	Fume composition and contamination control require specific attention; use the approved process and consumables
Aluminium alloys	Lightweight and corrosion-resistant, often used in artistic fabrication	Oxide, cleanliness, heat input, shielding, and alloy-specific consumable choice are important
Copper alloys	Used for decorative work, architectural details, and mixed-metal projects	High thermal conductivity and alloying elements affect process choice and fume risk
Cast iron	Found in repair and heritage work	Grade, cracking risk, thermal cycle, and repair procedure require specialist judgement
Historic wrought iron	May be encountered in conservation work	Preserve original material where possible; identify construction and condition before selecting a repair method
Covered electrodes	Consumable electrode for MMA	Classification, storage condition, diameter, polarity and procedure must match the approved job
Solid welding wire	Common consumable for MIG/MAG	Wire type, diameter, drive-roll setup, liner and shielding gas must be compatible
TIG filler rod	Separate filler metal added as required	Alloy and diameter must suit the base material and procedure
Tungsten electrode	Non-consumable arc electrode in TIG	Type, diameter, preparation and contamination condition must match the approved procedure
Shielding gas	Protects the arc and molten pool from atmospheric contamination	Gas identity and mixture must match the process and procedure; cylinders require correct handling and secure storage

Material uncertainty rule: If you cannot positively identify a base metal, coating, previous repair, container history, or contamination, do not apply heat merely to “see what happens”. Stop and obtain competent advice.

Thermal Cutting Principles

In oxy-fuel cutting, a preheat flame brings suitable ferrous metal to the required condition and a cutting-oxygen jet supports rapid oxidation and ejects reaction products from the kerf. The method is especially associated with carbon steels; it is not a universal process for every metal.

In plasma cutting, an electrically conductive gas becomes a high-temperature plasma jet that transfers energy to electrically conductive work. Plasma cutting can therefore be useful on steels, stainless steel, aluminium, and other conductive metals when the equipment and consumables are suitable.

Kerf is the width of material removed by the cut. It affects dimensional accuracy, nesting, cut allowance, and the amount of material wasted.

This oxy-fuel safety video is useful for recognising equipment and hazards. Actual setup, leak testing, lighting, shutdown, pressure selection, and fault response must be taught and assessed in person under the applicable workplace procedure.

Authentic Workshop Examples

Example: Mild-Steel Gate Frame

A blacksmith may forge decorative scrolls and fabricate the structural frame using MAG welding. The workshop drawing specifies section sizes, joint locations, dimensions, weld requirements, and finish. A competent learner checks that the steel is correctly identified, surfaces are suitable, fit-up is controlled, the approved wire and shielding gas are installed, fume extraction is positioned effectively, and distortion is considered before any welding begins.

Example: Sculpture Armature

An artistic-metalwork project may combine bent rod, forged details, and fabricated plate. MIG/MAG can provide fast assembly, while TIG may be chosen for smaller visible joints or particular materials. The best process is not simply the one available: access, material, appearance, heat input, joint design, finish, and workshop controls influence the decision.

Example: Heritage Railing Repair

A heritage railing may contain wrought iron, mild-steel additions, old welds, paint layers, corrosion products, or earlier repairs. The task begins with documentation and material assessment. Conservation goals may favour retaining original material rather than replacing it. Welding is not automatically the correct repair method, and heating unknown coatings or contaminated components can create serious exposure risks.

Example: Plasma-Cut Decorative Panel

A decorative panel may be cut from sheet or plate using a CNC or hand-guided plasma system. The designer must account for kerf, lead-ins, heat distortion, minimum feature size, edge quality, extraction, sheet utilisation, and safe handling of sharp or hot cut parts.

Risk Controls and UK Safety Duties

Scope of the Safety Guidance

For this module, workplace-safety guidance is based on the Health and Safety Executive for Great Britain. HSE states that all welding fume can cause lung cancer and requires employers to assess exposure and control it under COSHH. The practical control strategy normally prioritises avoiding or reducing fume generation, effective engineering controls such as local exhaust ventilation, and suitable respiratory protective equipment where the risk assessment shows it is required.

Relevant Great Britain legislation can include the Health and Safety at Work etc. Act 1974, Control of Substances Hazardous to Health Regulations 2002, Provision and Use of Work Equipment Regulations 1998, Personal Protective Equipment at Work Regulations 1992, Electricity at Work Regulations 1989, Dangerous Substances and Explosive Atmospheres Regulations 2002, and Confined Spaces Regulations 1997. Which duties apply depends on the actual work. This course is educational guidance, not a legal determination.

Do not assume that this Great Britain framework is automatically equivalent to Northern Ireland or to any other country.

Main Hazards and Controls

Hazard	Why it matters	Control approach
Welding and cutting fume	Can cause serious respiratory disease and cancer	Eliminate or reduce the process where reasonably practicable; use effective source extraction; maintain controls; use suitable RPE where required; keep other people out of exposure zones
Arc radiation	Ultraviolet and infrared radiation can injure eyes and skin	Suitable welding screen, correct welding PPE, controlled access, competent supervision
Fire and explosion	Sparks, hot metal, flame, electrical arcs, and hot slag can ignite combustibles or residues	Remove or protect combustibles, inspect hidden spaces, use permit-to-work controls where required, provide appropriate fire precautions and post-work fire watch
Electric shock	Welding circuits and damaged equipment can expose workers to dangerous electrical energy	Correct equipment, inspection, dry conditions where required, sound insulation, competent maintenance, isolation before intervention
Compressed gases and oxygen	Cylinders store high energy; oxygen enrichment can accelerate combustion; incorrect fittings or contamination can create severe hazards	Secure cylinders, use correct equipment, protect from damage, keep oxygen fittings free from oil and grease, follow manufacturer and workplace procedures
Acetylene	Unstable fuel gas requiring specific safe handling	Trained personnel only, correct cylinders and equipment, flashback protection, approved procedures
Asphyxiation	Shielding or purge gases can displace oxygen, especially in enclosed spaces	Avoid confined-space entry where possible, assess atmosphere, provide suitable ventilation and rescue arrangements, never use oxygen to “sweeten” air
Hot metal and spatter	Recently welded or cut metal may look cool but remain hot	Mark or segregate hot work, use suitable tools and PPE, allow controlled cooling, communicate status
Noise	Cutting, grinding, gouging, extraction, and fabrication can damage hearing	Reduce at source, isolate noisy work, maintain equipment, use suitable hearing protection where required
Grinding and edge preparation	Abrasive wheels can burst, catch, throw particles, and create dust	Correct wheel, guard, inspection, competent use, extraction, face and eye protection
Manual handling	Plate, sections, cylinders, jigs, and fabricated assemblies can be awkward or heavy	Plan the lift, use handling aids, team lifting where appropriate, stable storage

HSE guidance for welding fire risk states that the work area should be checked after hot work and describes a fire watch of at least 30 minutes, extended to 60 minutes where ignition could be difficult to detect or slow to develop. A workplace permit or local risk assessment may require longer.

Acetylene systems must be handled only by people with appropriate training and suitable equipment. This course deliberately does not provide gas-pressure settings, ignition sequences, bypass methods, or fault-recovery shortcuts.

Hierarchy of Control

When assessing a welding or cutting task, think in this order:

Eliminate: Can the hazardous operation be avoided entirely, for example by using a cold mechanical joint or buying material closer to final size?
Substitute: Can a lower-fume process, consumable, coating system, or preparation method achieve the required result?
Engineering controls: Use source extraction, enclosure, screens, automation, guarding, and suitable workholding.
Administrative controls: Use competent supervision, safe systems of work, permits, segregation, training, inspection, maintenance, and clear communication.
PPE and RPE: Use correctly selected, compatible, fitted, maintained, and stored protective equipment as the final layer, not as a replacement for higher-level controls.

Step-by-Step Demonstration

Supervised MAG Set-Up and Quality Check

This demonstration is a supervised educational sequence. It intentionally omits machine settings, gas-flow values, live electrical tests, and operating shortcuts. A learner must not energise the welding circuit, open a gas supply, strike an arc, or make an adjustment beyond their authorised training without a competent instructor.

Confirm authority and scope: Review the job sheet, drawing, risk assessment, COSHH information, local welding procedure, and instructor briefing.
Identify the material: Confirm the base material, thickness range, surface condition, and any coating or contamination. Stop if identification is uncertain.
Match consumables: Compare the approved wire, shielding gas, contact tip, and other consumables with the procedure and equipment documentation.
Inspect the plant: With the equipment in the safe state specified by the workshop procedure, visually check torch, leads, work-return clamp, feeder, guards, extraction, and inspection labels.
Prepare the work area: Position the work securely, control trip hazards, install screens, remove or protect combustibles, and establish the required hot-work controls.
Check fume control: Position the extraction inlet close enough to capture fume without disrupting the approved process. Confirm airflow using the workplace method.
Instructor gas-system check: The competent instructor verifies cylinder security, correct gas service, regulator and connections, and the approved leak-checking status.
Dry run: Without striking an arc, rehearse torch access, travel direction, body position, visibility, cable routing, and stop position.
Instructor-authorised weld: Only after all checks are accepted, carry out the specified supervised practice weld using the approved settings and technique taught locally.
Safe completion: Follow the workshop shutdown procedure, identify hot material, maintain required fire watch, and leave extraction running for the period required by the local procedure.
Inspect cooled work: Compare dimensions, bead profile, fusion indications, visible discontinuities, distortion, and finish with the drawing or acceptance criteria.
Record and reflect: Note what was checked, what was observed, any defect, and what should be changed under supervision on the next attempt.

Common Errors and Troubleshooting Logic

Troubleshooting should be systematic. Do not respond to a defect by randomly increasing current, wire speed, gas flow, or pressure. First stop safely, identify the symptom, compare with the approved procedure, and check the simplest verified causes.

Symptom	Possible causes to investigate	Safe response
Porosity	Contamination, inadequate shielding, leaks, wind or draught, unsuitable gas, excessive distance	Stop, protect the work, verify cleanliness and shielding system under supervision
Excessive spatter	Poor parameter balance, unstable arc, contamination, incorrect consumable or polarity	Compare setup with the approved procedure; do not compensate by guesswork
Lack of fusion	Poor joint preparation, unsuitable travel technique, insufficient approved heat input, inaccessible joint	Escalate and review joint design, preparation, position, and procedure
Slag inclusion	Incomplete slag removal, joint geometry, technique, incorrect sequence	Clean between passes as specified and have the joint reviewed before continuing
Tungsten contamination in TIG	Electrode contacts molten pool or filler, contaminated setup	Stop; allow safe cooling; restore the electrode according to the approved workshop method
Irregular wire feeding	Liner, drive rolls, spool condition, contact tip, cable routing or wire contamination	Isolate as required and have the feed system checked before welding
Rough oxy-fuel cut	Incorrect travel, unsuitable material, poor nozzle condition, wrong setup, contamination	Stop and have equipment, material and procedure checked; do not improvise gas settings
Heavy plasma dross	Travel or process setup not matched to material, worn consumables, poor torch condition	Check the approved cut chart and consumables under supervision
Excessive distortion	Heat concentration, poor sequence, insufficient restraint, joint design or fit-up	Review sequence, tack plan, clamping, joint design, and heat distribution before rework

Quality Criteria

Weld Quality

Quality is judged against the drawing, procedure, product standard, acceptance level, and purpose of the component. A decorative non-load-bearing object and a safety-critical structural component may require very different levels of control and evidence.

Important visible and dimensional checks include:

Joint preparation and cleanliness
Fit-up, root gap, alignment, and tack position where specified
Weld size and profile
Evidence of adequate fusion
Porosity and other surface cavities
Undercut
Slag or inclusions visible at the surface
Cracking, which always requires escalation
Distortion
Surface finish and damage to surrounding material

BS EN ISO 5817:2023 specifies quality levels for imperfections in fusion-welded joints in steels, nickel, titanium and their alloys. It uses quality levels B, C, and D, with B representing the highest requirement. The applicable level is specified by the job, contract, design, or governing standard; a learner should not choose a quality level arbitrarily.

Thermal-Cut Quality

For a cut edge, assess:

Kerf width and allowance
Dimensional accuracy
Edge squareness or angularity
Dross or adherent slag
Striation pattern
Heat-affected zone where relevant
Pierce quality
Surface roughness
Distortion
Damage to features that must remain

A cut that looks visually smooth is not automatically dimensionally correct, and a dimensionally correct cut may still require edge dressing before welding, forging, coating, or public handling.

Standards, Qualifications, and Certification

UK Standards References

The British Standards Institution lists BS EN ISO 4063:2023, Welding, brazing, soldering and cutting — Nomenclature of processes and reference numbers as the current UK adoption at the review date of this module. It provides internationally standardised process names and reference numbers.

BSI also lists BS EN ISO 5817:2023 for quality levels of imperfections in fusion-welded joints. Welder qualification is addressed by standards in the ISO 9606 series for specified processes and materials.

A published standard does not by itself train, qualify, certify, or authorise a person. The applicable contract, employer system, certification body, product standard, and legal framework determine what evidence is required.

England-Only Vocational Example

Country: England. The Skills England occupational standard Blacksmith, ST0378, version 1.1 is a Level 3 apprenticeship standard and was listed as approved for delivery at the review date. Its occupational knowledge, skills and behaviours include blacksmithing materials, use and maintenance of tools and equipment, welding plant, profile cutters, extraction systems, and thermal welding and cutting activities.

This is an England-only training-pathway example. It must not be treated as automatic equivalence with Scotland, Wales, Northern Ireland, Ireland, the United States, Canada, Australia, New Zealand, South Africa, or any other country.

City & Guilds also lists its Welding Skills 3268 qualifications, including welding, fabrication, and thermal-cutting learning at different levels. Centres must check the current qualification handbook, registration status, assessment requirements, and approved-centre conditions before delivery.

This aiMOOC does not award a qualification, coded-welder status, certification, licence, apprenticeship completion, or permission to work independently.

Inclusive Workshop Learning

Safe vocational education should make participation possible for learners with different physical characteristics, communication preferences, experience levels, and access needs without reducing safety standards.

Useful inclusive approaches include:

Provide written, spoken, and visual instructions for equipment identification, hazard controls, and work sequences.
Use adjustable work heights, suitable jigs, handling aids, and stable fixtures where these help learners achieve safe posture and control.
Supply PPE in a sufficiently broad range of sizes and designs so that protection is based on correct fit rather than assumptions about body shape.
Check whether communication remains effective when helmets, screens, extraction, hearing protection, or workshop noise reduce visibility or audibility.
Provide observation, inspection, drawing interpretation, material-identification, quality-assessment, and documentation roles alongside supervised practical activity.
Plan reasonable adjustments with the learner, competent instructor, employer or training provider, while retaining the risk controls essential to the task.
Assess RPE suitability through the employer's competent process; do not assume one facepiece design will fit every user.
Use photographs, diagrams, tactile samples where safe, labelled components, and step cards to reduce unnecessary language barriers.

Sustainability and Responsible Material Use

Sustainable fabrication combines resource efficiency with durable design and safe environmental controls.

Material efficiency: Nest profiles carefully, use standard stock sizes intelligently, and retain useful offcuts through an organised identification system.
Right first time: Accurate measurement, fit-up, jigs, and procedure control reduce scrap, grinding, rework, and energy use.
Process choice: Do not weld or thermally cut when a cold process, mechanical joint, forging operation, or purchased near-net component would meet the design more efficiently.
Consumable control: Store electrodes, wire, tungsten, nozzles, and filler material correctly to prevent contamination and premature disposal.
Gas management: Detect and repair leaks through authorised maintenance procedures; do not waste shielding or fuel gas.
Extraction maintenance: Maintain LEV so it remains effective, and handle collected dust or filters according to the material hazards and waste procedure.
Cutting strategy: Account for kerf, lead-in position, common-line opportunities where approved, and cut sequence to reduce scrap and distortion.
Heritage conservation: Retaining sound original ironwork can preserve cultural value and avoid unnecessary replacement material.
Surface preparation: Remove only what is necessary; uncontrolled grinding can destroy historic tool marks, reduce section thickness, and generate additional dust.
Design for repair: Where appropriate, create assemblies that can be inspected, maintained, repaired, and disassembled rather than replaced wholesale.

Glossary

Term	Practitioner meaning
Arc	Electrical discharge that supplies concentrated heat in an arc-welding process
Base material	The material being joined or cut
Consumable	Material or component intentionally used up during a process, such as wire, electrode, filler rod, nozzle, or contact tip
Dross	Re-solidified material adhering to the lower or edge region of a thermal cut
Duty cycle	The permitted operating proportion of a welding power source over a specified test period and condition
Filler metal	Metal added to a weld joint
Fit-up	The alignment, gap, and positioning of parts before joining
Heat-affected zone	Region of base material whose properties or microstructure have been changed by welding or cutting heat without melting
Kerf	Width of material removed by a cutting process
LEV	Local exhaust ventilation designed to capture contaminants near their source
MAG	Metal active gas welding using continuously fed wire and an active shielding gas
MIG	Metal inert gas welding using continuously fed wire and an inert shielding gas
MMA	Manual metal arc welding using a flux-coated consumable electrode
Porosity	Gas cavities trapped in solidified weld metal
RPE	Respiratory protective equipment
Slag	Non-metallic material produced from flux that can cover or become trapped in a weld
Spatter	Droplets of molten metal expelled from the welding process and deposited outside the intended weld
TIG	Tungsten inert gas welding using a non-consumable tungsten electrode
Work return	Conductor connecting the workpiece or welding table back to the welding power source; often informally called the earth lead
WPS	Welding procedure specification giving the essential approved instructions for producing a specified weld

Reflection

Consider your own training workshop or a professionally supervised workplace:

Which welding or cutting process is used most often, and why is it suitable for the materials and products made there?
Which tool is most frequently mistaken for a consumable, or which consumable is most frequently fitted incorrectly?
Where is welding fume captured, and how does the workshop show that the extraction system is functioning?
How are hot components identified so that another person does not touch or move them unknowingly?
What happens when a learner finds an unknown coating, damaged cable, gas-system concern, or cracked weld?
Which change would reduce waste without reducing craft quality, durability, or safety?

Interactive Tasks

Quiz: Test Your Knowledge

In precise UK welding terminology, what distinguishes MAG from MIG? (MAG uses an active shielding gas) (!MAG always uses a tungsten electrode) (!MAG is a thermal cutting process) (!MAG does not use shielding gas)

Which electrode is non-consumable in normal TIG welding? (Tungsten electrode) (!Covered MMA electrode) (!Solid MAG wire) (!Flux-cored wire)

What is the main purpose of local exhaust ventilation during welding? (Capture fume close to its source) (!Increase arc voltage automatically) (!Cool the workpiece to room temperature) (!Replace every need for supervision)

Why is oxy-fuel cutting particularly suited to many carbon steels? (The process relies on rapid oxidation of suitable ferrous metal) (!The process works only by mechanical abrasion) (!The process requires a tungsten electrode) (!The process can cut only aluminium)

What should you do if the fitted welding wire does not match the approved procedure? (Stop and resolve the mismatch before welding) (!Increase wire speed until the arc sounds stable) (!Continue if the wire diameter looks similar) (!Remove the equipment identification label)

What does a welding procedure specification provide? (Approved essential instructions for producing the specified weld) (!Automatic legal permission for any welding job) (!A guarantee that every weld is defect free) (!A substitute for competent supervision)

What is a kerf? (The width of material removed by a cutting process) (!The protective lens in a welding helmet) (!The clamp that completes the welding circuit) (!The coating on an MMA electrode)

What is the correct response to a visible crack in a weld under assessment? (Stop and escalate it against the acceptance criteria) (!Hide it with additional paint) (!Grind it until it is difficult to see) (!Ignore it if the bead is symmetrical)

Which control has the highest priority in the hierarchy of control? (Eliminate the hazardous operation where reasonably practicable) (!Rely only on gloves) (!Increase exposure time) (!Remove extraction to improve access)

What should a learner do if asked to perform hot work without the required supervision or authorisation? (Do not carry out the work) (!Proceed if the task appears simple) (!Copy settings from another machine) (!Ask another learner to watch)

Memory Game

Work return	Conductor completing the welding circuit through the workpiece
Nozzle	Replaceable torch part that directs gas or plasma at the process zone
Regulator	Device reducing cylinder pressure to a controlled working supply
Filler rod	Separate metal added by hand in processes such as TIG
Extraction hood	Inlet positioned to capture airborne contaminant near its source
Dross	Re-solidified material adhering to a thermal-cut edge

Drag and Drop

Match the correct terms.	Topic
Covered electrode	MMA consumable
Continuous solid wire	MIG or MAG consumable
Tungsten electrode	TIG arc electrode
Oxygen and fuel gas	Oxy-fuel cutting media
Plasma torch consumables	Plasma cutting parts

...

Crossword Puzzle

Regulator	Which device reduces cylinder pressure to a controlled supply?
Electrode	What is the current-carrying element that establishes the welding arc?
Extraction	What engineering control removes fume close to its source?
Porosity	What term describes gas cavities trapped in solidified weld metal?
Kerf	What is the width of material removed by a cutting process?
Dross	What re-solidified material may adhere to a thermal-cut edge?

LearningApps

Cloze Text

Open-Ended Tasks

Easy

Tool identification sheet: Create an illustrated one-page sheet naming at least ten welding or cutting components in your training workshop. Photograph or sketch equipment only when it is safe and permitted; do not operate it for the task.
Consumable comparison: Compare one covered electrode, one wire consumable, one TIG filler rod, and one plasma torch consumable. Record their function, identification markings, storage needs, and process.
Workshop interview: Interview a competent welder, blacksmith, or instructor about how they decide whether a damaged consumable, cable, torch part, or extraction hood can remain in service.
Safety signage audit: Walk through the supervised training area with an instructor and record which signs, screens, hot-work boundaries, cylinder markings, and extraction indicators help people understand risk.

Standard

Supervised equipment inspection: Using the approved workshop checklist, inspect a de-energised or otherwise safely isolated welding station with an instructor and document serviceable items, defects, and escalation actions.
Material selection case: Choose suitable base material and consumables for a small forged gate component from a provided set of specifications. Explain why each choice is compatible with the selected process.
Fume-control diagram: Draw an annotated diagram showing the welding source, fume plume, extraction inlet, worker position, screen, and nearby-person exclusion zone. Explain how poor hood placement reduces capture.
Cut-quality portfolio: Examine cooled, instructor-provided oxy-fuel or plasma cut samples. Photograph the edges and annotate kerf, dross, squareness, striations, distortion, and possible causes without operating the cutter.

Advanced

Supervised demonstration video: Produce a short training video in which a competent instructor demonstrates the pre-use checks for a welding station. Your role is to script, film, annotate hazards and controls, and verify terminology rather than perform unauthorised live work.
Weld quality investigation: Inspect a set of cooled practice coupons supplied by the instructor. Classify visible imperfections, compare them with the specified acceptance criteria, and propose a controlled investigation plan.
Sustainable fabrication plan: Redesign a small artistic-metalwork project to reduce stock waste, cutting length, grinding, rework, gas use, and difficult future repair while preserving appearance and structural intent.
Expert review project: Prepare a draft workshop tool-and-material selection guide for a blacksmithing task, then have it reviewed by a competent welding or safety specialist. Revise it and document every change made after expert feedback.

Learning Assessment

Process selection assessment: Given three blacksmithing fabrication scenarios, justify a suitable welding or thermal-cutting process for each by connecting material, joint geometry, finish, productivity, access, and workshop controls.
Risk-control assessment: Analyse a workshop photograph or instructor-created scenario and propose controls using the hierarchy of control, explaining why PPE alone is insufficient.
Heritage material uncertainty: Develop a decision path for a painted historic railing of uncertain material and repair history, showing when work must stop for identification, conservation advice, or hazardous-coating assessment.
Quality transfer assessment: Compare the inspection needs of a decorative sculpture joint with those of a load-bearing gate component and explain why the same visual appearance may not represent the same acceptance requirement.
Equipment fault assessment: Given symptoms such as erratic wire feed, damaged insulation, ineffective extraction, or a suspected gas leak, identify which issues require immediate isolation and competent intervention rather than operator adjustment.
Sustainability redesign assessment: Evaluate a fabrication plan for material yield, energy use, consumables, extraction waste, repairability, and heritage value, then propose measurable improvements.

Evidence of Learning

Evidence type	What demonstrates successful learning
Knowledge	Correct process terminology, tool identification, material awareness, and explanation of principal hazards and controls
Practical observation	Safe participation in supervised pre-use checks, work preparation, fume-control positioning, workholding, and post-work checks
Product	Accurate drawings, annotated inspection records, material and consumable schedules, or a safely produced supervised practice component
Reasoning	Clear justification of process, tooling, consumable, and risk-control choices rather than copying a familiar setup
Transfer	Ability to apply the same decision logic to a new material, joint, artistic design, repair task, or cutting method
Professional behaviour	Stops when uncertain, reports defects, follows authorised procedures, protects nearby workers, keeps records, and accepts expert correction

Media and Open-Licence Notes

The Wikimedia Commons media embedded in this course were selected because they illustrate processes, equipment, or inspection concepts directly. Always check the individual Commons file page for the precise author, source, and licence before republishing media outside MOOCwiki.

GMAW.welding.af.ncs.jpg: Gas metal arc welding photograph; Wikimedia Commons identifies it as a United States Air Force image in the public domain.
GMAW weld area.svg: Labelled gas-metal-arc welding zone diagram available on Wikimedia Commons under a Creative Commons licence.
Arc welding electrodes and electrode holder.triddle.jpg: Covered electrodes and holder; public-domain media on Wikimedia Commons.
Tig Welding.jpg: TIG welding photograph available on Wikimedia Commons under a Creative Commons licence.
Oxygas welding station.jpg: Oxy-gas station image available under free licences on Wikimedia Commons.
Oxy-fuel cutting.JPG: Oxy-fuel cutting image available on Wikimedia Commons under a Creative Commons licence.
TorchCuttingCloseup.jpg: Close view of mechanised plasma cutting, hosted on Wikimedia Commons with reuse permission.
Welded butt joint x-section.svg: Diagram of a welded butt-joint cross-section and heat-affected regions.
Welding helmet.jpg: Welding helmet photograph available on Wikimedia Commons under a Creative Commons licence.

The embedded YouTube videos remain third-party works and are not relicensed by this aiMOOC. Verify availability, suitability, advertising context, captions, and institutional access before classroom use.

Official UK Reference Set for Expert Review

These links were checked for this module on 1 September 2026. Because rules, standards, qualification versions, and web guidance can change, instructors should recheck them before practical delivery.

Health and Safety Executive — Welding: Great Britain welding safety hub.
Health and Safety Executive — Welding fume: protect your workers: Current HSE control guidance on welding fume.
Health and Safety Executive — Controlling the risks from welding: Risk assessment, engineering control, RPE, and protection of nearby workers.
Health and Safety Executive — Safety risks from welding: Fire, explosion, confined spaces, gas, electrical, and related risks.
Health and Safety Executive — COSHH welding guidance: Process-specific control guidance including welding, manual gas cutting, plasma cutting, and gouging.
Health and Safety Executive — Acetylene: Great Britain guidance on acetylene equipment and trained use.
Health and Safety Executive — PUWER: Duties concerning suitability, maintenance, inspection, and training for work equipment.
Health and Safety Executive — Personal protective equipment: Current HSE PPE guidance.
Skills England — Blacksmith ST0378 v1.1: England-only Level 3 blacksmith apprenticeship occupational standard.
City & Guilds — Welding Skills 3268: UK vocational qualification information; centres must check current handbooks and approval requirements.
BS EN ISO 4063:2023: UK standards reference for welding, brazing, soldering, and cutting process nomenclature and reference numbers.
BS EN ISO 5817:2023: UK standards reference for quality levels of fusion-welded joint imperfections.
BSI search — ISO 9606 series: Standards references concerning qualification testing of welders.

OERs on the Topic

Useful open background resources include Welding, Gas metal arc welding, Gas tungsten arc welding, Shielded metal arc welding, Oxy-fuel welding and cutting, Plasma cutting, Heat-affected zone, and the relevant Wikimedia Commons media categories. Use encyclopedia material for background learning; official current workplace rules, standards, risk assessments, and manufacturer instructions take precedence for practical work.