Welding and thermal cutting — Safe practice

Introduction

Welding and thermal cutting — Safe practice is the Safe practice module of Welding and thermal cutting. It is written for vocational learners in Blacksmithing, artistic and architectural metalwork, small fabrication workshops, and related craft settings.

Selected jurisdiction: United Kingdom — course implementation in England. Health-and-safety law in this course is the Great Britain framework enforced by the Health and Safety Executive (HSE) and applicable in England. The vocational-training reference is England only, using Skills England. British Standards Institution references are identified as UK standards references. Northern Ireland has a separate safety regulator and legal framework, and apprenticeship systems differ across the four UK nations. This course does not claim automatic equivalence with Ireland, the United States, Canada, Australia, New Zealand, South Africa, or any other country.

Priority rule: official law and regulator guidance, the employer's current risk assessment, safe system of work, permit-to-work arrangements, welding procedure or work instruction, equipment manufacturer's instructions, and directions from a competent supervisor always take precedence over this learning material.

Supervision rule: you must not strike an arc, light or adjust oxy-fuel equipment, carry out thermal cutting, alter welding parameters, test gas systems, work on tanks or drums, or enter a confined space unless you are trained, authorised and supervised in accordance with your workplace or training provider's safe system. This aiMOOC is not a licence, competence certificate, coded-welder qualification or permission to work alone.

The annotated oxy-gas station image is useful for identifying equipment and separation of functions, but it is not a substitute for the equipment manufacturer's instructions or a current workplace setup check.

The HSE training video above is intended for schools, colleges and industry and focuses on preventing harmful exposure to welding fume.

Why safe practice matters in artistic metalwork

A blacksmith or artistic metalworker may switch between forging, grinding, MIG or MAG welding, TIG welding, MMA welding, brazing, oxy-fuel cutting, plasma cutting, dressing and finishing in one job. A gate frame, sculpture, handrail, fire basket or heritage repair can therefore combine heat, flame, electricity, compressed gases, radiation, fume, noise, sharp edges, heavy workpieces and combustible materials in the same work area.

A short tack weld is still welding. HSE states that all welding fume can cause lung cancer and that suitable control measures are required for welding activities. The practical lesson is simple: “only a quick weld” is not a reason to omit controls.

Learning outcomes

By the end of the module, you should be able to explain the main hazards of welding and thermal cutting, select risk controls using the hierarchy of control, recognise when LEV and RPE are needed, describe safe arrangements for gas cylinders and oxy-fuel equipment, protect other people from arc radiation and hot-work hazards, carry out a supervised pre-use and work-area check, identify common unsafe practices, judge basic visual quality against a specification, and explain how safe practice can reduce waste, rework and environmental impact.

Jurisdiction, Duties and Vocational Context

United Kingdom — England scope

This module was source-checked on 1 September 2026. For England, relevant Great Britain duties include the Health and Safety at Work etc. Act 1974, the Management of Health and Safety at Work Regulations 1999, the Control of Substances Hazardous to Health Regulations (COSHH) 2002, the Provision and Use of Work Equipment Regulations (PUWER) 1998, the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) 2002, the Personal Protective Equipment at Work Regulations 1992 as amended in 2022, the Control of Noise at Work Regulations 2005, the Manual Handling Operations Regulations 1992, and the Confined Spaces Regulations 1997 where applicable.

These are not interchangeable checklists. Which duties apply depends on the task, workplace, substance, equipment and people exposed. A competent employer or training provider must assess the actual work.

Official safety sources for England: HSE — Welding HSE — Controlling the risks from welding HSE — Safety risks from welding HSE — Safe use of acetylene HSE — PUWER overview HSE — PPE regulations amended in 2022

England vocational reference: Blacksmith apprenticeship

Skills England lists the Blacksmith apprenticeship ST0378, version 1.1, Level 3 as approved for delivery. Its occupational standard describes blacksmithing as craft, art or skill used to design, shape and join metal for bespoke, small-batch and heritage work. The standard explicitly includes health-and-safety knowledge, welding plant, profile cutters and extraction systems, and the skill area “Thermal Welding and cutting” using hand-operated thermal equipment.

Skills England — Blacksmith ST0378 v1.1

Completing this aiMOOC does not complete ST0378, an end-point assessment, a welder qualification test, or any third-party certification. If a drawing, contract, structural application, conservation specification or employer requires a qualified welding procedure or qualified welder, the applicable project requirements and current standards must be followed.

UK standards references

British Standards Institution listings should be checked for current status before procurement, specification or assessment because standards are revised and withdrawn. Relevant examples current at the source-check date include BS EN ISO 11611:2015 for protective clothing used in welding and allied processes, BS EN ISO 16321-2:2021 for eye and face protectors used during welding and related techniques, BS EN ISO 25980:2023 for transparent welding curtains, strips and screens, BS EN ISO 21904-1:2020 for equipment used to capture and separate welding fume, and BS EN ISO 17637:2016 for visual testing of fusion-welded joints.

BSI — BS EN ISO 11611:2015 BSI — BS EN ISO 16321-2:2021 BSI — BS EN ISO 21904-1:2020 BSI — BS EN ISO 17637:2016

A standard is not automatically a legal requirement merely because it exists. It may become contractually or technically important through legislation, client specifications, product standards, employer procedures or accepted good practice. Always verify what applies to the job.

Core Concepts

Hazard, risk and control

A hazard is something with the potential to cause harm. Risk combines the likelihood of harm with its possible severity. A control measure reduces either the chance of exposure or the consequences.

For welding and cutting, the hierarchy of control should guide decisions before PPE is selected.

Priority	Control idea	Metalwork example
Eliminate	Remove the hazardous activity where reasonably practicable	Use a cold mechanical joint where the design permits instead of welding
Substitute or reduce	Use a method, material or sequence that creates less exposure	Reduce unnecessary weld length or select a lower-fume process suitable for the specification
Engineering control	Control the hazard at source or separate people from it	Use effective LEV, extracted benches, on-torch extraction, guards and welding screens
Administrative control	Organise the work safely	Use training, authorisation, hot-work controls, exclusion zones, inspection routines and supervision
PPE and RPE	Protect the individual against residual risk	Use suitable welding eye and face protection, protective clothing, gloves, footwear and RPE selected for the task

PPE is not the first answer to every hazard. Engineering controls and safe systems of work should be considered first, while PPE protects against residual risk.

Process overview

Process	Practitioner terminology	Typical craft use	Main safety focus
MIG and MAG	Gas metal arc welding; in UK workshops “MIG” is often used informally even when active shielding gas makes the process MAG	Frames, gates, brackets, sculpture armatures and general fabrication	Welding fume, arc radiation, electricity, shielding gas, hot metal, spatter and noise
TIG	Tungsten inert gas welding	Controlled joints, thinner work, stainless steel and decorative fabrication where the process is suitable	Arc radiation, ozone and other fume or gas hazards, electricity, shielding gas and hot metal
MMA	Manual metal arc welding, also called stick welding	Repair, site fabrication and heavier sections where suitable	Fume, slag, spatter, electric shock, arc radiation and hot electrode stubs
Oxy-fuel cutting	Flame cutting or oxy-gas cutting	Cutting carbon-steel sections and plate where the process is suitable	Fire, explosion, fuel gas, oxygen, flashback, hot slag, fume and cylinders
Plasma cutting	Plasma arc cutting	Fast cutting of electrically conductive metals	Intense light, fume, noise, electricity, compressed gas or air, hot dross and fire

The photographs show real processes, not model risk assessments. Conditions, PPE, extraction and work positioning must be judged against the actual task.

Hazard Recognition and Risk Controls

Welding fume and gases

Welding fume is a mixture of very fine particles and gases whose composition depends on the process, parent metal, consumable, coating, surface contamination and work conditions. HSE treats welding fume as a serious health hazard and states that all welding fume can cause lung cancer.

For indoor welding, use suitable local exhaust ventilation (LEV) where reasonably practicable to capture fume at source. Common forms include on-torch extraction, extracted benches, extracted booths and movable capture hoods. The hood or extraction point must stay within its effective capture zone and must not pull the fume plume through your breathing zone.

HSE's current control guidance also distinguishes genuinely sporadic welding — less than once a week and for less than one hour — from regular welding. In such limited circumstances engineered fume controls will not normally be expected if suitable RPE and good general ventilation provide the required minimum protection. Nearby people must still be protected, and this exception is not permission for unprotected welding.

This HSE video shows typical MIG welding fume emissions.

This HSE video gives practical guidance on using on-torch extraction.

This HSE video demonstrates an extracted welding bench.

This HSE video provides additional current practical advice on on-torch extraction.

Where LEV alone cannot adequately control exposure, or where LEV is not reasonably practicable, suitable respiratory protective equipment (RPE) is needed. HSE identifies powered or supplied-air respiratory protection with an assigned protection factor of at least 20 as a strong option for arc welders and gives FFP3 or P3 particulate options for certain short-duration work, subject to suitability, fit and the contaminant. Particulate filters do not protect against every gas.

Tight-fitting RPE needs face-fit testing and a clean-shaven sealing area. Facial hair, head coverings, prescription eyewear, communication needs and other PPE must be considered when selecting a compatible system. A powered hood or another solution may be more suitable for some users, but selection belongs to the employer's competent RPE programme rather than to personal preference alone.

Outdoor welding is not “fume free”. HSE states that LEV cannot be relied on outdoors, so suitable RPE and protection of other people still need to be considered.

LEV must be maintained and checked. Under COSHH, HSE states that LEV should normally receive thorough examination and testing at least every 14 months, with records kept for at least five years. Daily users should also look for damage and signs that capture is not working.

Coatings, contamination and unknown metal

Do not assume a painted, plated, galvanised, oily, chemically cleaned or heritage component is safe to heat. Coatings and residues can add hazardous substances to fume or create fire and decomposition risks. Identify the metal and surface treatment from drawings, supplier information, safety data, historic records or competent assessment before hot work. If the material cannot be identified, stop and escalate the task.

Cleaning can create its own dust, solvent, noise or fire hazards. “Remove the coating” is not a complete control plan; the removal process must also be assessed.

Fire, hot work and explosion

Welding and thermal cutting can ignite combustible material well beyond the immediate flame or arc because sparks, hot slag and conducted heat travel. Before work, remove combustibles where practicable, protect surfaces, establish the required exclusion area, check hidden voids and the other side of partitions, and follow the site hot-work permit system where one is used.

A hot-work permit is an administrative control, not a guarantee of safety. It should confirm that hazards have been checked, precautions are in place, responsibility is assigned and post-work monitoring is defined.

Never weld or flame-cut a drum, tank, vessel or pipe merely because it appears empty. Residual vapour can explode. HSE specifically warns about hot work on drums and tanks. Such work requires a competent, task-specific system and may be prohibited in a training environment.

Oxy-fuel equipment, oxygen and fuel gases

Oxygen supports combustion very strongly. Never use oil, grease or unsuitable lubricants on oxygen fittings. Fuel-gas leaks can create fire and explosion hazards. Acetylene is extremely flammable and can also decompose explosively under certain conditions.

For an oxy-fuel setup, cylinders must be secured and protected from damage, regulators and hoses must be correct for the gas and service, and suitable flashback protection must be provided in accordance with current HSE guidance, equipment instructions and workplace arrangements. HSE guidance recommends flashback arresters near the regulator on both fuel and oxygen supplies and additional protection where hose length or layout increases risk.

When checking for a suspected leak, use an approved leak-detection method specified by the manufacturer or workplace. Never test for a gas leak with a flame.

The diagram shows the principle of oxy-fuel cutting. It does not show regulator settings or a lighting sequence; those must come from supervised training, the manufacturer's instructions and the approved process for the equipment in use.

Flashback and abnormal conditions

A flashback is a dangerous event in which flame travels back into the blowpipe, hose or upstream equipment. If a flashback, overheating, damaged hose, leaking fitting, unusual vibration, unstable flame or other abnormal condition occurs, stop work using the emergency procedure you have been trained to use and alert the supervisor. Do not improvise repairs.

If an acetylene cylinder has been exposed to fire or may have been affected by a flashback, HSE guidance requires specialist precautions. Learners should evacuate and follow emergency instructions rather than approach or cool a suspect cylinder unless the emergency plan and trained fire service direct otherwise.

Arc radiation and protection of other people

Arc welding produces intense ultraviolet, visible and infrared radiation. Direct or reflected exposure can injure the eyes and skin. Use suitable welding eye and face protection selected for the process and task, plus welding screens or curtains to protect nearby workers and visitors.

Ordinary sunglasses are not welding filters. Auto-darkening and fixed welding filters must be suitable for the process and marked to the applicable product standard. Welding curtains are for shielding other people; they do not replace the operator's welding filter.

A craft workshop often has reflective metal, pale walls, polished sculpture surfaces and visitors who may not recognise an active welding bay. Control reflected radiation and establish a clear exclusion zone before striking an arc.

Protective clothing, gloves and footwear

Suitable welding clothing should cover the skin and resist ignition, spatter and radiant heat for the assessed task. BS EN ISO 11611 is a key UK standards reference for welding protective clothing. The standard does not by itself specify every item needed for hands, face, eyes or feet, so the full PPE ensemble must be assessed for compatibility.

Avoid open pockets, turned-up cuffs or clothing details that can trap hot particles. Keep clothing dry and reasonably clean; contamination can change protective performance. Gloves must suit the process and still permit safe control. Footwear should protect against hot metal and workshop hazards identified by the risk assessment.

Inclusive PPE means selecting from suitable sizes and designs rather than forcing every learner into one shape of glove, helmet, respirator or garment. Accommodation for prescription eyewear, hearing protection, long hair or religious head coverings must preserve the protective function and be agreed with the competent supervisor.

Electrical hazards

Arc-welding circuits can cause electric shock and burns. Equipment must be suitable, maintained and used according to the manufacturer and PUWER arrangements. Inspect cables, connectors, torch or electrode holder, return lead and insulation before use; report defects rather than taping or modifying equipment without authorisation.

The welding return should make a sound connection to the workpiece or approved fixture. A poor or indirect return path can create stray current, heating and shock hazards. HSE warns against using unrelated handrails, pipes or structural frames as a return path unless they are part of the workpiece and the arrangement is specifically safe.

Wet conditions, cramped positions and damaged insulation increase risk. Stop work if the environment is not suitable.

Noise, grinding and associated work

Welding and thermal cutting are often followed by chipping, wire brushing and grinding. HSE data show that MIG, plasma cutting, flame cutting, air-arc gouging and grinding can reach harmful noise levels depending on the process and conditions. The employer must assess daily exposure and apply the Control of Noise at Work Regulations where relevant.

Noise control should begin with quieter processes, equipment, maintenance, isolation and job planning where reasonably practicable. Hearing protection is selected for residual risk; more attenuation is not automatically better if it prevents communication or warning signals.

Grinding also creates flying particles, sparks and dust. A welding helmet in the raised position is not automatically the correct impact eye protection for grinding. Follow the grinder-specific safe system.

Hot metal, sharp edges and stored heat

Freshly welded or cut metal can look identical to cold metal. Mark or segregate hot workpieces and communicate their status. Think about heat conducted along long bars, frames or railings, especially where another person may handle the far end.

Cut edges may be razor sharp and dross may detach unexpectedly. Use appropriate tools and handling methods; do not test an edge or temperature with bare hands.

Workpiece stability, handling and ergonomics

Artistic metalwork often involves irregular shapes, scrolls, long frames and top-heavy sculpture elements. Support and clamp work so it cannot rotate, fall or close on the operator. Consider the centre of gravity before cutting a member that may release stored stress or change the balance of an assembly.

Use lifting aids or team handling where the risk assessment requires them. HSE's manual-handling hierarchy is to avoid hazardous handling where reasonably practicable, assess unavoidable handling and reduce the risk.

Good welding posture is also a fume control: position yourself so the plume does not rise through your breathing zone and so LEV can capture it without forcing awkward reach.

Confined and enclosed spaces

Confined-space welding is a high-risk task. Shielding gases can displace oxygen, and carbon monoxide or other contaminants can accumulate. HSE's first question is whether entry can be avoided. If entry is necessary, a specialist safe system, atmosphere controls, communication, supervision and emergency rescue arrangements are required.

Vocational learners must not treat a tank, pit, vessel, large sculpture shell or enclosed fabrication as an ordinary welding booth. Never use oxygen to freshen or “sweeten” the air; HSE identifies this as a serious fire risk.

Tools and Materials

Equipment you may encounter

Item	Function	Safe-practice check
Welding power source	Supplies controlled welding current	Correct process, inspected condition, suitable supply, controls understood, no unauthorised modification
MIG or MAG torch and wire-feed system	Delivers wire, current and shielding gas	Sound liner, contact tip, nozzle and cable; extraction functioning if integrated
TIG torch	Holds tungsten electrode and delivers shielding gas	Correct components, sound insulation, suitable gas connection
MMA electrode holder	Holds coated electrode	Insulation intact, correct rating and safe storage when not in use
Welding return lead and clamp	Completes the welding circuit	Short, sound route and good connection to clean approved contact point
Oxy-fuel blowpipe and cutting attachment	Mixes gases and delivers heating and cutting flame	Correct equipment for gases, maintained, inspected and used only by trained authorised people
Regulators	Reduce cylinder pressure to controlled working pressure	Correct gas and service, undamaged, no oil or grease on oxygen equipment
Hoses	Carry oxygen and fuel gas	Correct service, sound condition, protected from heat, sparks, sharp edges and traffic
Flashback arresters	Reduce the risk of flame travelling upstream	Correct type and location according to current guidance and manufacturer instructions
Gas cylinders	Store compressed or dissolved gases	Correct identification, secured, valves protected, separated and stored according to site rules
LEV	Captures fume near its source	Airflow indication normal, hood placed correctly, filters and system maintained
Welding curtain or screen	Shields others from arc radiation and spatter	Correct standard or equivalent performance, intact and positioned to close sight lines
RPE	Protects wearer from residual inhalation risk	Correct type, fit, filter or airflow, battery condition, clean storage and compatibility
Fire-control equipment	Supports the site emergency plan	Correct provision for the assessed fire risk and people trained in its use

Materials and consumables

Typical craft work may involve mild steel bar and plate, stainless steel, wrought or historic ironwork, filler wire, coated electrodes, shielding gases, cutting gases, anti-spatter products, abrasives and surface coatings. Every material choice changes the hazard profile.

Before hot work, identify the parent metal, coating, consumable and cleaning product. Use the current safety data and technical information where relevant. Do not substitute a gas, electrode, wire, torch part or abrasive simply because it physically fits.

Safe Workshop Layout

A safe welding bay separates hot work from storage, walkways, finishing chemicals and members of the public. The workpiece should be stable, the operator should have a clear escape route, cables and hoses should not create trip hazards, and extraction should be positioned so the plume is captured without pulling it through the operator's breathing zone.

Text diagram — source-to-person control path:

WELD OR CUT SOURCE
        |
        v
Capture fume at source with suitable LEV
        |
        v
Keep the operator's breathing zone out of the plume
        |
        v
Use screens to protect nearby people from arc radiation and spatter
        |
        v
Use suitable RPE and PPE for remaining risk
        |
        v
Inspect, shut down, mark hot metal and monitor the area

The HSE video above demonstrates movable LEV. Notice that the hood must be repositioned as the weld location changes.

Step-by-Step Demonstration

Trainer-led demonstration: preparing, making and closing out one short weld

Scope: a competent trainer demonstrates a short weld on clean, known mild steel at a prepared training bench. The purpose is to demonstrate the safe sequence, not to teach a learner to operate alone. Machine settings, gas-flow values, filler selection and welding parameters come from the approved work instruction, welding procedure and manufacturer instructions and are deliberately not specified here.

Step	Demonstration action	What you should notice
Authorise the task	Trainer confirms the risk assessment, training status, work instruction and any required hot-work permit	No hot work starts merely because the equipment is available
Identify the material	Trainer confirms parent metal, coating status and consumable	Unknown or contaminated material triggers a stop and escalation
Make the area safe	Combustibles are removed or protected, screens are closed, the workpiece is clamped and access is controlled	The controls protect both the operator and other people
Check extraction	Trainer carries out the required pre-use LEV check and positions the hood or on-torch extraction	Capture point is close enough to the source and the plume will not cross the breathing zone
Inspect welding equipment	Cables, torch, return lead, connectors, gas system and controls receive the workplace pre-use check	Damaged equipment is isolated and reported, not improvised back into service
Select PPE and RPE	Trainer confirms compatible eye and face protection, clothing, gloves, footwear, hearing protection where required, and suitable RPE	PPE choice follows the risk assessment; tight-fitting RPE requires a valid fit arrangement
Establish the return path	Return clamp is placed on an approved clean contact point	The current path is short and controlled
Dry-run body position	Trainer rehearses hand position, travel path, cable or hose clearance and LEV movement without striking an arc	Head stays out of the expected fume plume and posture remains stable
Make the weld	Trainer carries out the short weld to the approved instruction while maintaining extraction and shielding	No learner or observer views the arc without suitable protection
Respond to change	Trainer explains that loss of extraction, equipment fault, gas leak, unstable arc, fire, damaged screen or unexpected material behaviour means stop work	“Finish the bead first” is not the priority when a control has failed
Shut down	Trainer follows the equipment and workplace shutdown and isolation procedure	Energy and gas sources are left in the approved safe condition
Control residual heat	Work is marked or segregated as hot and the area is checked for sparks, smouldering material and affected surfaces	The hazard continues after the arc stops
Inspect quality	Trainer visually checks the joint against the drawing, work instruction and acceptance criteria	Safety, quality and traceability are part of one professional process
Record and review	Required checks, defects, consumables or permit close-out are recorded	Learning includes reporting and continuous improvement

Oxy-fuel demonstration boundary

For oxy-fuel work, a trainer may demonstrate identification of cylinders, regulators, hoses, flashback protection, separation from ignition hazards, leak-check arrangements and the manufacturer's shutdown sequence. Learners should not infer gas pressures, valve-opening sequence, lighting technique or tip selection from this aiMOOC. Those are equipment-specific practical competencies taught face to face under supervision.

Common Errors and Better Practice

Common error	Why it is unsafe or poor practice	Better practice
“It is only one tack, so extraction is unnecessary”	Welding fume still requires control	Apply the assessed fume controls for every welding task
LEV hood is left behind as the weld progresses	Fume escapes the capture zone	Reposition the hood or use an appropriate on-torch or extracted system
Welder leans directly over the plume	Fume passes through the breathing zone	Reposition body and work while maintaining control and weld quality
Tight-fitting respirator is used without fit testing or with facial hair in the seal	The seal may leak	Use the employer's RPE programme and a suitable system for the wearer
Welding screen has a gap facing a walkway	Other people can receive arc radiation	Close sight lines and control access before striking the arc
Return clamp is attached to a rusty remote part of a frame	High resistance and stray current can create heat and shock risks	Use the approved clean return point close to the work
Hot steel is placed on a normal bench without warning	Another person may pick it up	Mark, segregate or communicate hot material status
Oil is used on an oxygen fitting	Oxygen can react violently with contamination	Keep oxygen equipment free from oil and grease
A suspected fuel-gas leak is checked with a flame	The test can ignite the leak	Use the approved leak-detection method
Cylinder is left unsecured	It can fall, damage the valve or create an emergency	Secure it in the approved position and location
Empty drum is flame-cut without a specialist assessment	Residual vapour can explode	Do not proceed; use the competent hot-work-on-vessels procedure
Plasma cutting noise is dismissed because the cut is brief	Short high-level exposure can still contribute significantly to daily noise dose	Include the process in the workplace noise assessment

Quality Criteria

Safe practice and quality reinforce each other. A rushed setup can cause both exposure and defects, while good fit-up, clean material, stable clamping and controlled parameters support both.

For a supervised craft weld, inspect the joint against the drawing, work instruction and any applicable welding procedure. Typical visual questions include whether the joint is in the correct location, whether fit-up and alignment are within specification, whether the weld is continuous where required, whether profile is consistent, and whether visible imperfections such as cracks, pores, undercut, overlap, lack of fill or excessive spatter exceed the stated acceptance criteria. Do not invent your own tolerance when the job specifies one.

For a thermal cut, check that the cut follows the marked line or profile, edge condition is suitable for the next operation, dross and taper are within the job requirement, heat distortion is controlled, and enough material remains for final finishing where the design requires it.

BS EN ISO 17637:2016 is a useful reference for systematic visual testing of fusion-welded joints, but acceptance levels normally come from the relevant application standard, drawing, contract or procedure rather than from visual testing alone.

The image shows a cooled TIG fillet weld. A photograph can support discussion of appearance, but it cannot prove full compliance, penetration, material identity or hidden soundness.

Sustainability and Resource Responsibility

Safe metalwork is usually more resource-efficient metalwork. Good planning reduces scrap, rework, excessive weld metal, grinding and energy use. Nesting cut profiles can reduce offcuts. Correct fit-up can reduce repeated heating and distortion correction. Maintaining torches, extraction and consumable delivery systems reduces failed starts and wasted consumables.

Capture and filter fume according to the workplace system rather than releasing contaminants into shared air. Segregate metal scrap by the workshop's recycling scheme. Treat grinding dust, contaminated filters, chemical cleaning residues and coating waste according to their assessed hazards and local waste arrangements. Return gas cylinders through the approved supplier system rather than treating cylinders as general scrap.

In conservation and artistic work, preserving serviceable historic material can be more sustainable than replacing it, but heritage value never justifies uncontrolled exposure. Where cold joining or a lower-emission method can meet the technical and conservation requirement, include it in the options assessment.

Authentic Craft Scenarios

Gate frame in a small forge

A fabricator prepares a mild-steel gate frame for MAG welding. The job involves long sections that can move when tacked, a welding plume near face height, grinding for fit-up and a public walkway near the shop entrance. The safe plan combines stable jigs, controlled lifting, source capture, a welding screen, noise and eye protection for grinding, a clean return point and a post-work hot-material zone.

Decorative stainless-steel detail

A TIG-welded decorative detail demands clean appearance and heat control. TIG may produce less visible particulate fume than some processes, but invisible gases and ozone can still matter. The risk assessment must consider the material, duration, ventilation and RPE needs rather than using visibility as the test of safety.

Heritage railing repair

An old railing arrives with multiple paint layers and unknown previous repairs. The correct first action is not to grind or burn the coating away. Identify the coating and substrate, decide how contamination will be controlled, assess whether hot work is appropriate, and protect the original fabric. A conservation specification may also limit what material can be removed.

Public-art sculpture assembly

A large sculpture shell creates awkward internal spaces, long current paths and difficult extraction. Before anyone enters or welds inside, ask whether the geometry creates an enclosed or confined-space hazard. Redesigning the assembly sequence so more joints are made from outside can eliminate major risk.

Glossary

Term	Meaning in this module
Arc eye	Painful injury to the cornea caused by exposure to welding radiation
Breathing zone	The air around the nose and mouth from which a person draws breath
Competent person	A person with sufficient training, knowledge, experience and other qualities for the specific task or duty
COSHH	Control of Substances Hazardous to Health Regulations
DSEAR	Dangerous Substances and Explosive Atmospheres Regulations
Fume plume	Rising cloud of particles and gases generated by welding or thermal processes
Flashback	Flame travelling back into oxy-fuel equipment beyond the normal flame position
Hot work	Work capable of producing flame, heat, sparks or other ignition sources, including welding and thermal cutting
LEV	Local exhaust ventilation used to capture airborne contaminant close to its source
MAG	Metal active gas welding, a gas metal arc process using an active shielding-gas component
MIG	Metal inert gas welding, a gas metal arc process using inert shielding gas
MMA	Manual metal arc welding using a flux-coated consumable electrode
Parent metal	The base material that is being joined or cut
PPE	Personal protective equipment worn to protect against residual risk
PUWER	Provision and Use of Work Equipment Regulations
RPE	Respiratory protective equipment
Return lead	Conductor that completes the welding circuit from the workpiece back to the power source
Spatter	Droplets of molten or hot material expelled during welding
TIG	Tungsten inert gas welding using a non-consumable tungsten electrode
Welding procedure	Approved technical instruction defining how a weld is to be produced for a specified application

Reflection

Consider a recent or imagined metalwork job. Which hazard would remain if you wore perfect PPE but had no extraction, no screen and no stable fixture? Which control should be moved higher in the hierarchy? How would the plan change if the workpiece were painted, hollow or installed on site? What evidence would convince you that the LEV is actually capturing fume? Which part of the safe system depends most on communication with other people?

Interactive Tasks

Quiz: Test Your Knowledge

What is the first priority when controlling welding fume? (Avoid or reduce the exposure where practicable) (!Choose the darkest welding screen available) (!Increase the welding current) (!Open a door and ignore source capture)

What does LEV do in welding work? (Captures fume close to its source) (!Changes the shielding gas into oxygen) (!Tests the strength of the finished weld) (!Replaces all need for supervision)

What should you do before hot work on an unidentified painted component? (Identify the material and coating hazards) (!Burn the coating away to see the metal) (!Assume old paint is harmless) (!Increase the torch temperature)

What is the correct response to a suspected fuel gas leak? (Use the approved leak detection method) (!Test the fitting with a flame) (!Tighten every fitting while gas is flowing) (!Ignore the leak if it is small)

Why are welding screens used? (To protect nearby people from arc radiation and spatter) (!To replace the welder eye filter) (!To increase gas pressure) (!To cool the workpiece)

What is a safe principle for the welding return lead? (Use an approved clean connection close to the work) (!Clamp to any distant handrail) (!Place the clamp on thick rust) (!Route current through gas cylinders)

What should happen when extraction fails during a weld? (Stop work and restore the control before continuing) (!Finish the whole job before reporting it) (!Lean closer to see the fume) (!Remove the respirator to communicate)

Why must hot metal be marked or segregated? (It may look the same as cold metal) (!It always becomes magnetic) (!It cannot conduct electricity) (!It is safe once the arc stops)

What is the correct approach to confined space welding? (Avoid entry where possible and use a specialist safe system) (!Use oxygen to freshen the air) (!Work alone to reduce crowding) (!Rely on smell to detect low oxygen)

What does completion of this aiMOOC provide? (Structured learning evidence but not a welding qualification) (!Automatic coded welder status) (!Permission to work without supervision) (!Automatic equivalence in every country)

Memory Game

Local exhaust ventilation	Captures welding fume close to its source
Flashback arrester	Device that helps stop flame travelling upstream in gas equipment
Welding screen	Barrier that protects other people from hazardous arc radiation
Return lead	Conductor that completes the welding circuit through the workpiece
Face fit test	Check that a tight fitting respirator seals adequately on the wearer
Hot work permit	Administrative record confirming specified precautions and authorisation
Parent metal	Base material being welded or cut

Drag and Drop

Match the correct terms.	Topic
Capture fume at source	Local exhaust ventilation
Protect nearby people from arc radiation	Welding screen
Prevent hazardous manual handling where possible	Handling plan
Confirm a tight respirator seal	Face fit testing
Control ignition risk before welding or cutting	Hot work system

...

Crossword Puzzle

Ventilation	What system removes contaminated air from a welding process?
Flashback	What event sends flame back into oxy fuel equipment?
Respirator	What item protects the wearer from specified airborne contaminants?
Radiation	What arc hazard can injure unprotected eyes and skin?
Competence	What quality combines suitable knowledge training and experience for a task?
Housekeeping	What workshop practice keeps combustible waste and trip hazards under control?

LearningApps

Cloze Text

Open-Ended Tasks

Easy

Hazard spotting poster: Create an English-language poster for a welding bay showing at least eight hazards and the control that should be checked before work; use photographs only from openly licensed sources.
PPE compatibility sketch: Draw and label a complete PPE and RPE arrangement for one supervised welding scenario, then explain which items must be compatible and which risks still require engineering controls.
Hot metal communication: Design a simple sign, tag or bench-zone system that prevents another person from picking up recently welded or cut metal, and test the idea with classmates without using live hot work.
Supervisor interview: Interview a qualified instructor or workplace supervisor about the three most common safe-practice errors they see in welding or thermal cutting and summarise how those errors are corrected.

Standard

LEV observation study: During an instructor-led welding demonstration, observe how the LEV hood or on-torch extraction is positioned, make a labelled diagram of the capture arrangement, and record only non-operational observations approved by the instructor.
Gate frame risk plan: Produce a risk-control plan for welding a decorative mild-steel gate frame in a small workshop, covering fume, radiation, fire, workpiece stability, noise, handling and post-work checks.
Media safety review: Select one openly licensed welding or cutting image and annotate what can and cannot be concluded about safe practice from the image alone; distinguish visible evidence from assumptions.
Workshop visit record: Visit an approved college or professional metalwork workshop with supervision and create a short report on zoning, screens, extraction, cylinder management, signage, housekeeping and inclusive PPE provision.

Advanced

Heritage repair method statement: Draft a method-statement outline for a painted historic railing repair, including stop points for unknown coatings, conservation approval, hot-work controls and quality verification; do not perform the repair.
Sustainability and safety audit: Compare two technically suitable joining or cutting routes for an artistic-metalwork component and evaluate exposure control, energy use, rework risk, consumables, waste and recyclability before recommending one.
Training video storyboard: Storyboard a three-minute safety video for apprentices that demonstrates pre-use checks, LEV positioning, exclusion of bystanders and hot-work close-out; any live welding footage must be produced only by the competent trainer under the training provider's controls.
Expert review dossier: Build a review pack containing a scenario risk assessment, process description, standards references, PPE and RPE rationale, quality checklist and reflection questions, then ask a welding instructor or occupational-safety professional to mark statements that need correction or local adaptation.

Learning Assessment

Control hierarchy assessment: Given a scenario with visible welding fume, poor extraction and an uncomfortable respirator, explain which controls should be reconsidered first and justify the order using the hierarchy of control.
Artistic metalwork transfer: Compare safe practice for a small decorative TIG joint with a large MAG-welded gate frame and explain which controls stay the same and which must change because of geometry, duration and bystander exposure.
Oxy-fuel decision task: Review a fictional setup with unsecured cylinders, oily oxygen fittings and a damaged hose, identify why work must not start, and describe the escalation route without giving operating pressures or lighting instructions.
Confined space reasoning: Analyse a hollow sculpture that requires internal joining and propose design or assembly changes that could eliminate the need for a person to weld inside it.
Quality and safety link: Explain how poor fit-up, unstable clamping and rushed grinding can create both weld-quality defects and health or safety risk, then propose a combined control plan.
Source verification task: Check one HSE and one BSI source from this course for current status, record the access date, and explain how you would update the workshop instruction if the official source changed.

Evidence of Learning

Useful evidence includes accurate hazard recognition; correct use of the hierarchy of control; a reasoned explanation of welding-fume controls; knowledge of gas, fire, electrical, radiation, noise, handling and confined-space hazards; a supervised pre-use and close-out checklist; correct identification of when to stop and escalate; a risk-control plan for a blacksmithing or artistic-metalwork scenario; visual-quality observations tied to a drawing or specification; a sustainability comparison; clear communication with other workers; correct use of UK and England source labels; and a portfolio showing reflection, corrections after expert feedback and awareness that this aiMOOC does not confer practical competence or certification.

OERs on the Topic

Unless otherwise noted, the original explanatory text and task design in this aiMOOC are released under Creative Commons Attribution-ShareAlike 4.0 (CC BY-SA 4.0). Embedded Wikimedia Commons files retain the licences and attribution requirements shown on their file pages. Embedded HSE YouTube media retain their source and platform terms and are linked as external media rather than relicensed by this course.

Verified open media used

Wikimedia Commons — Oxygas welding station.jpg Wikimedia Commons — Brennschneiden.svg Wikimedia Commons — Tig Welding.jpg Wikimedia Commons — Oxy-fuel cutting1.jpg Wikimedia Commons — Corte por plasma.jpg Wikimedia Commons — Welding helmet.jpg Wikimedia Commons — 08-TIG-weld.jpg

Official review sources

HSE — Welding fume: protect your workers HSE — Controlling the risks from welding HSE — Health risks from welding HSE — Safety risks from welding HSE — Safe use of compressed gases in welding and flame cutting HSE — Safe use of acetylene HSE — PPE law amended in 2022 Skills England — Blacksmith ST0378 v1.1 BSI Knowledge — standards status search

Expert-review note: legislation, regulator guidance, apprenticeship standards and product standards change. Before classroom delivery or workplace use, a qualified welding instructor and the organisation's competent health-and-safety person should review the module against local equipment, current risk assessments, current HSE guidance and current BSI status.