Assessing and Controlling Risks from Welding Fumes

Welding is essential across Australian construction, manufacturing, transport, mining and maintenance. It is also a significant source of airborne contaminants. The visible plume from an arc or flame process can contain metal particles, gases and substances formed when coatings, solvents or shielding gases are heated. Some contaminants irritate the lungs immediately, while others can contribute to occupational disease after repeated exposure. Learn more about Pekgora.org.

The risk depends on the welding process, base metal, consumables, surface coatings, ventilation, work duration and location. A brief repair outdoors is different from several hours of stainless-steel welding inside a tank. A workshop in Geelong, a fabrication shed in Western Australia and a mobile maintenance crew in regional Queensland may all need different controls.

Australian businesses generally work within state or territory work health and safety laws, with guidance from Safe Work Australia and regulators such as WorkSafe Victoria, WorkSafe WA and SafeWork NSW. The term “WHS” is widely used, although some jurisdictions still use “OHS”. Employers, supervisors, contractors and workers share responsibilities for identifying hazards and keeping exposure as low as reasonably practicable.

Effective control starts before the welder strikes an arc. It combines an assessment of airborne contaminants with equipment selection, local exhaust ventilation, safe work procedures, training, atmospheric testing where necessary and health monitoring. Respiratory protective equipment has an important role, but it should not be treated as the first or only answer.

Why welding fumes require careful attention

Welding fumes are a mixture of very fine particles and gases. The metal composition may include iron, manganese, nickel, chromium, copper, aluminium, lead or zinc, depending on the parent metal, electrode, wire and flux. Gas-shielded processes can also generate ozone, nitrogen oxides and carbon monoxide under particular conditions.

Stainless-steel work deserves special attention because it can produce fumes containing nickel and hexavalent chromium compounds. Welding or cutting galvanised steel may release zinc oxide, which can cause metal fume fever. Painted, degreased, oily or solvent-contaminated surfaces may create additional toxic products when heated. Removing coatings safely is part of controlling the welding hazard.

Short-term effects can include eye, nose and throat irritation, coughing, chest tightness, headache, dizziness and flu-like symptoms. Repeated or high exposure may affect lung function or the nervous system, depending on the contaminant. Some welding-related substances are classified as carcinogenic. The absence of a strong smell is not evidence that the air is safe.

Start with a task-based exposure assessment

A useful assessment describes the actual job rather than assigning a general risk rating to “welding”. Record the process, current, voltage, duty cycle, consumable, base metal, coating, position and duration. Note whether the work occurs in a workshop, vehicle bay, construction site, mine, ship, silo, tank or other enclosed area.

Look at the number of welders working nearby and the movement of air. Natural ventilation may vary with wind, doors, roof design and temperature. In a hot Pilbara workshop, large doors may be open for comfort while air movement carries fumes towards another worker. In a small Melbourne fabrication shop, a fan placed behind the operator may push the plume across the breathing zone.

The assessment should consider non-routine work, including grinding, thermal cutting, gouging, welding over old paint and repairs in confined spaces. Ask whether a worker’s face is positioned above the plume, whether extraction arms can reach the joint, and whether nearby people receive the same exposure. Contractors and labour-hire workers need to be included in the same assessment.

Sampling can help confirm the level of exposure when the risk is uncertain or controls are being checked. Personal sampling near the worker’s breathing zone is generally more informative than a single reading taken across a room. Results should be compared with current Australian workplace exposure standards, while recognising that a standard is a control benchmark, not a guarantee of zero harm.

Apply the hierarchy of controls

Elimination or substitution should be considered first. A design change may remove the need for a welded joint, while a lower-fume process, less hazardous consumable or pre-fabricated component may reduce emissions. Cleaning coatings before hot work can prevent the formation of additional contaminants. Mechanised or robotic welding can move workers away from the source, although maintenance and programming tasks still require assessment.

Engineering controls are usually the main protection for routine welding. Local exhaust ventilation should capture fumes close to the arc before they enter the operator’s breathing zone. Extraction arms need sufficient airflow, correct positioning and regular inspection. Downdraught benches, back-draught tables and enclosed extraction systems may suit repetitive fabrication.

General ventilation helps dilute contaminants but should not replace source capture. Fans can be useful when correctly designed, but an ordinary pedestal fan may disperse fumes through the workplace. Airflow should never carry contaminants towards another person. Exhaust air must be discharged safely, and systems should be checked for blocked filters, damaged ducting and inadequate capture.

Administrative controls support physical measures. Schedule high-fume tasks when fewer workers are nearby, limit time in contaminated areas, keep heads out of the plume and prohibit unauthorised alteration of extraction equipment. A written hot-work procedure should cover preparation, ventilation, ignition sources, fire prevention and clean-up. In Australia, a “spotter” or fire watch may be required for hot work, but that role does not remove the need to control airborne contaminants.

Select and use respiratory protection properly

Respiratory protective equipment is needed when engineering controls cannot adequately reduce exposure, during short-duration or unusual tasks, and while controls are being installed or repaired. The respirator must match the hazard. A particulate filter will not protect against every gas, and a filter suitable for iron fume may be inappropriate for contaminants from coatings or confined-space work.

Tight-fitting respirators require fit testing for the individual wearer and the particular model. Facial hair, glasses, welding helmets and hoods can affect the seal. Powered air-purifying respirators may be useful for welding because they can work with a welding helmet and reduce breathing resistance, but the battery, filter and airflow need to be maintained.

Workers need instruction on fitting, pre-use checks, cleaning, storage, filter replacement and the signs of failure. RPE should never be shared without suitable hygiene controls. A worker who feels dizzy, develops breathing difficulty or notices unusual fumes should stop safely, move to fresh air and report the incident. Emergency arrangements are especially important for work in tanks, pits and other confined spaces, where supplied-air systems and atmospheric controls may be required.

Manage the wider work environment

Welding fumes are only one part of the exposure picture. Ultraviolet radiation can cause arc eye and skin injury, while heat, noise, sparks, fire, electric shock, compressed gases and awkward postures may occur in the same task. Screens should protect nearby workers from arc radiation without preventing supervision or restricting ventilation.

Keep combustible materials away from hot work and check the opposite side of walls, floors and panels for hidden ignition risks. Gas cylinders should be secured, identified and separated as required. Leads, earth clamps and welding machines need inspection, and wet conditions require particular care. In a Queensland summer, heat stress can be intensified by welding PPE and poor airflow; rest, hydration and shaded recovery areas should form part of the work design.

Clean-up methods matter. Dry sweeping can re-suspend settled metal dust, while compressed air may spread contaminants and expose other workers. Use suitable industrial vacuum equipment or controlled wet methods where compatible with the material and electrical arrangements. Waste, used filters and contaminated rags should be handled according to the substances involved.

A clear induction is essential for contractors arriving on a large site, such as a Western Australian mine or a Sydney infrastructure project. Site rules should explain designated welding areas, extraction points, permit systems, emergency contacts and reporting expectations. Supervisors should verify that controls are operating in practice rather than relying solely on signed paperwork.

Build health monitoring into the programme

Health monitoring may be appropriate when workers are exposed to hazardous substances that can affect health and when there is a reasonable likelihood of disease or adverse effects. The need depends on the contaminant and the level, frequency and duration of exposure. It should be arranged through a qualified occupational health professional and connected to the risk assessment.

Records of welding processes, consumables and exposure controls help health professionals interpret symptoms and test results. Workers should know how to report persistent cough, wheezing, unusual fatigue, recurrent headaches, skin irritation or flu-like symptoms after welding. Symptoms must not be dismissed as ordinary “welder’s flu”, particularly when exposure to stainless steel, coatings or confined-space contaminants is possible.

Health information should be handled confidentially and communicated in a way workers can understand. A person checking whether symptoms may relate to their menstrual cycle or another personal health issue may consult general health information, but workplace symptoms after fume exposure still warrant appropriate medical advice. Employers should focus on exposure prevention and seek professional guidance rather than asking workers to diagnose themselves.

Health monitoring does not substitute for exposure control. If results suggest an emerging problem, the employer should review the process, investigate the source and improve controls. Workers should be told about relevant outcomes in a manner that protects privacy while making clear what action is required.

Verify controls and involve workers

Control measures should be checked after installation and whenever the process changes. A new wire, coating, welding position, extraction layout or production rate can alter exposure. Supervisors can observe whether extraction hoods remain close enough, whether workers keep their faces out of the plume and whether filters are changed on schedule.

Worker consultation often identifies practical failures that a formal inspection misses. Welders know when an extraction arm is too heavy to reposition, when a helmet fogs, when a fan creates turbulence or when production pressure encourages shortcuts. Toolbox talks, pre-start meetings and safety representatives can turn those observations into corrective action.

Use maintenance records, exposure monitoring, incident reports and health feedback to review the programme. A small fabrication business can use a straightforward checklist, while a national contractor may need a central register covering multiple sites and subcontractors. Resources such as risk-assessment tools and occupational safety guidance can help employers document decisions without making the process needlessly complex.

A suitable performance measure is whether the control works at the worker’s breathing zone, not whether the workshop merely looks clean. The goal is consistent protection during ordinary production, breakdowns, awkward welds and urgent repairs. Australian workplaces should also check current regulator guidance, relevant Australian Standards and any client or principal-contractor requirements.

Protecting welders begins with identifying what is in the fume, where it travels and who can breathe it. Review each welding task, prioritise source capture and substitution, provide suitable respiratory protection, and train workers to recognise changing conditions. Employers, supervisors and workers can use the next pre-start meeting to inspect extraction, discuss recent jobs and record one practical control improvement before the arc is struck.