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How to Protect Construction Workers from Welding Fumes

Best Practice

Welding is an inherent and indispensable part of construction sites across Australia, from structural steelwork and pipefitting to essential equipment repairs and on-site fabrication.

However, the fumes generated during welding present serious health risks that construction managers and site supervisors must address. With changes to Australian workplace exposure standards, understanding how to protect workers from welding fumes has become more critical than ever.

What are Welding Fumes?

Welding fumes form when metal is heated above its boiling point during the welding process. As these vapours cool, they condense into extremely fine particles that are small enough to be inhaled deep into the lungs. These fumes contain a complex mixture of metallic oxides, silicates, and fluorides, with the specific composition depending on factors such as:

• The base metal being welded
• The welding process used
• The type of electrode or filler material
• Any coatings present on the metal
• The flux or shielding gas employed

Some welding fumes are visible as smoke or mist, but many are invisible and can only be detected using specialised monitoring equipment. This invisible nature makes welding fumes particularly dangerous, as workers may be exposed without realising the extent of the hazard.

Health Risks from Welding Fume Exposure

The health effects of welding fume exposure range from immediate discomfort to serious long-term diseases. In 2017, the International Agency for Research on Cancer reclassified all welding fumes as Group 1 carcinogens, meaning they are known to cause cancer in humans.

Short-Term Health Effects

Workers exposed to welding fumes may experience immediate symptoms, including:

• Eye, nose, and throat irritation
• Dizziness and nausea
• Headaches
• Coughing and chest tightness
• Metal fume fever, which presents as a flu-like illness with fever, chills, and body aches

These acute effects can occur within hours of exposure and, whilst often temporary, they indicate that harmful exposure is taking place.

Long-Term Health Consequences

Repeated exposure to welding fumes can lead to far more serious health conditions. Studies report increased risk of lung cancer in welders or other workers exposed to welding fumes. Chronic exposure can also result in:

• Occupational asthma
• Reduced lung function and chronic obstructive pulmonary disease (COPD)
• Permanent lung damage including pneumoconiosis
• Kidney damage
• Nervous system damage and Parkinson's-like symptoms, particularly from manganese exposure

Australian Workplace Exposure Standards

Understanding the regulatory landscape is important for construction site managers. As of November 2025, Australian work health and safety authorities have implemented significant changes to workplace exposure standards for welding fumes.

The workplace exposure standard for welding fumes (not otherwise classified) has been reduced from 5 mg/m³ to 1 mg/m³, measured as an eight-hour time-weighted average. Similarly, the exposure standard for aluminium welding fumes has been reduced from 5 mg/m³ to 1 mg/m³. These reductions represent an 80% decrease in the allowable exposure level and reflect growing scientific evidence about the serious health risks welding fumes pose.

Note: It's important to understand that exposure standards represent the maximum statutory upper limit, not an acceptable level of exposure.

Under Australian work health and safety legislation, employers must take all reasonably practicable steps to eliminate or minimise risks from welding fume exposure, not simply ensure that exposure remains below these limits.

Individual components of welding fumes, such as chromium, nickel, manganese, and lead, also have their own specific exposure standards that must not be exceeded. Construction businesses must ensure compliance with both the general welding fume standard and the standards for individual hazardous components.

Who Is at Risk?

While welders face the highest risk of exposure, welding fumes can affect anyone working near welding operations. This is particularly true in indoor construction environments or confined spaces where fumes cannot easily dissipate. Workers in enclosed or confined spaces with a welder can face the same level of risk as the welder themselves.

On construction sites, this means that supervisors, labourers, electricians, and other trades working in the vicinity of welding operations may all be exposed to the harmful fumes. This broader exposure risk makes comprehensive fume control essential, rather than relying solely on protecting individual welders.

Controlling Welding Fume Exposure

Protecting construction workers from welding fumes requires a systematic approach based on the hierarchy of controls. This framework prioritises the most effective control measures that eliminate the hazard or reduce exposure at the source, rather than relying on personal protective equipment (PPE) alone.

1. Elimination and Substitution

The most effective way to control any hazard is to eliminate it entirely. On construction sites, this might involve using alternative joining methods such as bolts or mechanical fasteners instead of welding where feasible, or selecting welding processes that generate less fume. Pulsed, submerged arc, and tungsten inert gas (TIG) welding typically produce fewer fumes than manual metal arc or flux-cored arc welding.

When welding is necessary, selecting consumables with lower concentrations of hazardous metals, particularly manganese, can reduce the toxicity of the fumes generated. Removing coatings from the weld area before welding can also significantly reduce fume generation.

2. Engineering Controls – Local Exhaust Ventilation

When elimination isn't practical, controlling fumes at their source is the next most effective approach. Local exhaust ventilation (LEV) systems capture welding fumes as close to the source as possible, before workers can be exposed to them.

On construction sites, LEV can take several forms:

• Portable fume extractors with flexible arms that can be positioned near the welding point
• On-gun fume extraction systems that capture fumes directly at the welding torch
• Welding booths or enclosures with built-in extraction
• Exhaust hoods positioned above welding areas

For these systems to work effectively, they must be properly designed, regularly maintained, and positioned correctly. Captured fumes should be filtered and exhausted to the atmosphere, preferably outside the workshop or work area.

In addition to LEV, general ventilation is often required; it dilutes any residual airborne contaminants and ensures good airflow is maintained throughout the work area.

3. Employee Training Controls

Training is a crucial part of safekeeping; all workers who perform or work near welding operations should understand:

• The health risks
• How to position themselves to minimise exposure
• The importance of using control measures correctly
• When and how to use respiratory protection

4. Personal Protective Equipment

Personal protective equipment should never be the sole control measure for welding fumes, but it provides an essential additional layer of protection. For welding fume protection, respiratory protection is critical. Powered air purifying respirators (PAPRs) offer excellent protection in most welding situations and are generally more comfortable for extended wear. In confined spaces, externally air-fed helmets may be required.

It's important to note that respiratory protective equipment protects only the person wearing it and does nothing to control fumes at the source. All respiratory protection must comply with Australian standards (AS/NZS 1716:2012) and be:

• Properly selected for the specific hazards present
• Correctly fitted to each individual welder
• Regularly maintained and inspected

Implementing Effective Fume Extraction Solutions

For construction sites with significant welding operations, professional fume extraction systems provide the most reliable protection. These systems are designed to capture welding fumes at the source, filter them effectively, and maintain clean air in the work environment.

RVT Group's industrial fume extraction solutions are specifically designed for construction and industrial applications. Our systems offer:

• Portable and scalable options suitable for sites of any size
• High-efficiency filtration to capture the fine particles in welding fumes
• Robust design that can withstand the demands of construction environments
• Flexible hire arrangements that adapt to changing project requirements

What distinguishes professional fume extraction systems from standard ventilation methods is their ability to maintain compliance with workplace exposure standards whilst allowing work to continue efficiently.

Moving Forward with Welding Fume Protection

The tightened workplace exposure standards reflect the serious health risks welding fumes pose. Construction site managers must respond by implementing comprehensive fume control measures that prioritise engineering controls over personal protective equipment alone. Professional fume extraction systems capture welding fumes at their source, creating a safer working environment for everyone on site whilst maintaining compliance with workplace exposure standards.

RVT Group specialises in providing fume extraction solutions for construction and industrial sites across Australia. To discuss your site's welding fume control requirements or arrange a free site assessment, contact us at 1300 086 248 or visit our fume extraction equipment page to learn more about available solutions.