Understanding the Risks of Welding Fumes and How to Control Them

Welding is an essential process across many industries, but it also produces hazardous airborne contaminants that can pose serious health risks if they are not effectively controlled.

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Welding fumes are made up of a complex mixture of fine metal particles and gases created when metals are heated to high temperatures. Many of these particles are so small that they cannot be seen with the naked eye, allowing them to be inhaled deep into the lungs.

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At A-Mac Environmental, we design, install, test and maintain Local Exhaust Ventilation (LEV) systems that capture welding fumes at source, helping businesses protect their workforce and support compliance with UK health and safety legislation.

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What Are Welding Fumes Made Of?

The exact composition of welding fumes depends on the materials being welded and the welding process being used.

Welding fumes may contain:

• Iron oxide

• Manganese

• Chromium

• Nickel

• Zinc oxide

• Copper

• Aluminium

• Carbon monoxide

• Nitrogen oxides

• Ozone

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The level of risk depends on factors such as the welding process, the base metal, filler materials, coatings and the working environment.

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Why Are Welding Fumes Dangerous?

Without effective control, repeated exposure to welding fumes can contribute to serious health problems.

Potential health effects include:

• Irritation of the eyes, nose and throat

• Coughing and shortness of breath

• Occupational asthma

• Metal fume fever

• Long-term lung disease

• Damage to the nervous system from exposure to certain metals

• Increased risk of certain cancers associated with prolonged exposure to specific welding fumes

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The risk increases where welding is carried out in enclosed or poorly ventilated spaces.

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Which Welding Processes Produce Fumes?

Almost all welding processes generate fumes, including:

• MIG welding

• TIG welding

• MMA (stick) welding

• Flux-cored arc welding

• Plasma cutting

• Oxy-fuel cutting

• Resistance welding

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Even low-fume processes still require an assessment to determine whether exposure needs to be controlled.

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How Can Welding Fumes Be Controlled?

The most effective way to reduce exposure is to capture fumes as close to the source as possible.

Common control measures include:

• Local Exhaust Ventilation (LEV)

• Extraction arms

• Welding booths

• Downdraught benches

• On-torch extraction systems

• General ventilation to support extraction

• Safe working practices

• Appropriate respiratory protective equipment (RPE), where required

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Engineering controls such as LEV should normally be the primary method of controlling exposure, with PPE used as an additional measure where necessary.

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The Importance of Local Exhaust Ventilation (LEV)

An effective LEV system captures welding fumes before they reach the welder's breathing zone.

A well-designed system can help:

• Improve workplace air quality

• Reduce employee exposure

• Improve visibility within the work area

• Reduce the build-up of airborne contaminants

• Support compliance with COSHH Regulations

• Create a safer and more comfortable working environment

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Every welding application is different, which is why extraction systems should be designed specifically for the processes being carried out.

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Maintaining Welding Fume Extraction Systems

Installing an extraction system is only part of the solution.

To remain effective, LEV systems should be:

• Inspected regularly

• Serviced in accordance with manufacturer recommendations

• Kept clean

• Monitored for airflow performance

• Subject to a Thorough Examination and Test (TExT) at least every 14 months, or more frequently where required

 

Regular maintenance helps ensure the system continues to provide effective protection.

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Industries That Require Welding Fume Control

Effective welding fume extraction is essential across many industries, including:

• Fabrication and metalworking

• Manufacturing

• Engineering

• Automotive workshops

• Shipbuilding and marine engineering

• Construction

• Agricultural engineering

• Aerospace

• Defence

• Rail engineering

• Maintenance workshops

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Where welding is carried out, suitable control measures should always be considered.

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How A-Mac Environmental Can Help

A-Mac Environmental provides complete welding fume extraction solutions for businesses throughout Scotland.

Our services include:

• Welding fume extraction system design

• LEV system installation

• Extraction arms and capture systems

• Centralised extraction systems

• Air filtration equipment

• LEV Thorough Examination and Test (TExT)

• Planned preventative maintenance

• Repairs and system upgrades

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Our qualified P601 and P602 engineers work with businesses of all sizes to deliver reliable, compliant extraction systems tailored to their operations.

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Frequently Asked Questions

 

Are welding fumes harmful?

Yes. Welding fumes contain a mixture of airborne particles and gases that can affect health if exposure is not adequately controlled. The level of risk depends on the welding process, materials and duration of exposure.

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Is welding fume extraction a legal requirement?

Employers have a legal duty under the Control of Substances Hazardous to Health (COSHH) Regulations to prevent or adequately control exposure to hazardous substances, including welding fumes. In many workplaces, Local Exhaust Ventilation (LEV) is an effective way of achieving this.

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Can general ventilation replace LEV?

General ventilation can help improve overall air movement, but it does not normally replace the need to capture welding fumes at source. LEV is designed specifically to remove contaminants before they spread throughout the workplace.

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How often should welding fume extraction systems be tested?

Most LEV systems require a Thorough Examination and Test (TExT) at least every 14 months, although some applications may require more frequent examinations depending on the level of risk.

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Can existing welding extraction systems be upgraded?

Yes. Many older systems can be improved with upgraded extraction arms, fans, filters or ductwork to improve performance and support compliance with current guidance.

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If your business carries out welding, cutting or metal fabrication, A-Mac Environmental can help you create a safer working environment.

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Our experienced engineers provide professional LEV design, welding fume extraction, Thorough Examination and Test (TExT), maintenance and repairs throughout Scotland.

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Contact A-Mac Environmental today to discuss your welding fume extraction requirements or arrange a site survey.