Welding Fume in ManufacturingMelbourne
Melbourne is Australia's largest manufacturing city by employment, with the western and northern industrial corridors housing hundreds of steel fabrication workshops, structural steel manufacturers, and precision welding operations. The impending WES reduction to 1 mg/m³ from December 2026 is driving a wave of baseline exposure assessments across Melbourne's manufacturing sector as businesses determine which operations will exceed the new limit and what controls are required.
Melbourne Local Context
Melbourne's manufacturing corridor stretches from Altona and Laverton in the west through Brooklyn, Derrimut, and Sunshine to the northern suburbs of Campbellfield, Somerton, and Epping. This corridor contains the highest concentration of steel fabrication and welding operations in Australia. Many workshops were built in the 1970s and 1980s with natural ventilation only, meaning the transition to the 1 mg/m³ WES will require capital investment in LEV systems, on-torch extraction, or enclosed welding cells. WorkSafe Victoria inspectors have been conducting targeted welding fume campaigns since 2020.
WorkSafe Victoria Enforcement
Occupational Health and Safety Act 2004 (Vic), Occupational Health and Safety Regulations 2017 (Vic)
Victorian courts imposed $17.39 million in total OHS fines in 2025, with manufacturing the most prosecuted sector
Over 30 manufacturing prosecutions concluded in 2024-2025, many involving welding and metal fabrication operations
WorkSafe Victoria issued 215 improvement notices to welding operations in a single targeted compliance campaign
Directors face personal liability for failing to ensure adequate ventilation controls in welding workshops
Major Project Types in Melbourne
Key Hazards
Primary exposure hazards requiring monitoring in Melbourne.
MIG and FCAW welding in fabrication
Metal Inert Gas (MIG) and Flux-Cored Arc Welding (FCAW) are the dominant processes in manufacturing fabrication workshops. FCAW in particular generates high fume emission rates due to the flux decomposition. Workshop environments with multiple welding bays operating simultaneously create cumulative background fume levels that affect all workers in the space, not just the welders themselves.
Stainless steel welding and Cr(VI) generation
Welding stainless steel by any process generates hexavalent chromium Cr(VI) in the fume. Cr(VI) has a WES of 0.05 mg/m³ TWA and is a confirmed lung carcinogen and respiratory sensitiser. TIG welding on stainless steel generates lower total fume mass but a higher percentage of Cr(VI) relative to total fume. Separate filter cassettes are required for Cr(VI) analysis to prevent reduction to Cr(III) during storage.
Manganese in mild steel fume
Mild steel welding fume contains manganese at 5-15% of total fume mass. The WES for manganese is 1 mg/m³ TWA inhalable fraction. Chronic overexposure causes manganism, a progressive neurotoxic condition. Manufacturing welders performing full-shift welding on mild steel are at elevated risk of exceeding the manganese WES even when total fume levels appear moderate.
Confined and semi-enclosed welding
Fabrication of tanks, vessels, hoppers, and large assemblies requires welders to work inside or partially inside the structure. Fume concentrations inside semi-enclosed fabrications can be 5 to 10 times higher than open workshop levels. Portable LEV or on-torch extraction must be assessed for effectiveness in these configurations.
Common Analytes
Substances typically included in occupational hygiene sampling proposals for this sub-category.
Typical Worker Groups
Common similar exposure groups (SEGs) assessed for this sub-category.
Regulatory Context
Safe Work Australia published the Welding Processes Code of Practice in 2019 following the IARC Group 1 reclassification of welding fume. The code requires all welding fume to be captured at source or controlled to below the WES using engineering controls as the primary measure, with RPE as supplementary only. From 1 December 2026, the WES for welding fume (not otherwise specified) reduces from 5 mg/m³ to 1 mg/m³ inhalable fraction. Health monitoring is required for workers with significant welding fume exposure, including respiratory function testing and a medical assessment by a registered medical practitioner with experience in occupational health. The WHS Regulation also requires health monitoring for hexavalent chromium under Schedule 14.
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