Stainless Steel Welding Fume SWMS

Stainless steel welding generates fume containing hexavalent chromium (Cr VI) and nickel compounds, both IARC Group 1 human carcinogens with workplace exposure standards of 0.05 mg/m³ and 1 mg/m³ respectively under the Safe Work Australia Workplace Exposure Standards. Gas metal arc, gas tungsten arc, flux-cored and manual metal arc processes on austenitic and duplex grades release respirable metal oxides that deposit deep in the alveolar region, causing lung cancer, sinonasal cancer, occupational asthma and chronic kidney damage. WHS Regulation 2025 Part 4.1 obliges the PCBU to eliminate or minimise airborne contaminant exposure so far as is reasonably practicable, conduct atmospheric monitoring where exposure may exceed the WES, and provide health surveillance for Schedule 14 hazardous chemicals including chromium (VI) compounds. The Safe Work Australia Welding Processes Code of Practice 2021 mandates a documented SWMS covering local exhaust ventilation design, on-tool extraction, biological monitoring and respiratory protection selection. This SWMS satisfies those obligations and provides a defensible audit trail for SafeWork inspectors.

Hazards identified

7 hazards covered, sorted by priority.

Control measures

Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.

1. 1Elimination — Specify pre-fabricated stainless assemblies or mechanical fastening at the design stage to eliminate site welding on chromium-bearing alloys wherever the engineering brief permits.
2. 2Elimination — Remove painted, oiled or galvanised coatings from joint areas by mechanical means before welding to eliminate secondary fume contaminants and isocyanate decomposition products.
3. 3Substitution — Substitute SMAW with GTAW or pulsed GMAW low-spatter transfer modes which generate up to 70% less respirable fume per kilogram of deposited weld metal.
4. 4Substitution — Specify low-chromium-emission filler wires (AS/NZS 17633 classified) and high-silicon flux systems to reduce Cr VI yield while maintaining mechanical properties.
5. 5Engineering — Install on-tool extraction MIG guns (Nederman, Lincoln, or equivalent) with minimum 95 m³/h capture flow and document LEV commissioning under AS/NZS 4114 every 12 months.
6. 6Engineering — Provide moveable LEV hoods within 300 mm of arc with capture velocity ≥0.5 m/s, supported by general dilution ventilation delivering 6+ air changes per hour.
7. 7Administrative — Conduct atmospheric monitoring per AS 3640 against Cr VI WES 0.05 mg/m³ at task commencement, after process changes, and annually; retain records for 30 years per WHS Reg 2025 r50.
8. 8Administrative — Enrol welders in health surveillance program per WHS Reg 2025 Schedule 14 including baseline and biennial urinary chromium biological monitoring against BEI 25 µg/g creatinine.
9. 9Administrative — Pre-start SWMS sign-on, hot work permit, exclusion zoning of 6 m radius, and competency verification to AS/NZS ISO 9606-1 before any stainless welding commences.
10. 10PPE — Supply PAPR with TH3 P3 particulate filter (minimum APF 50) per AS/NZS 1716, flame-resistant leathers, AS/NZS 1338.1 shade 11–13 lens, and chrome-resistant nitrile gloves.

Applicable Codes of Practice

Worked example

At a regional food-grade dairy processing fitout, a fabrication subcontractor is installing 316L stainless CIP pipework inside a partially enclosed plant room. At the 6:45 am pre-start brief the leading hand opens the Stainless Steel Welding Fume SWMS on the site tablet and walks the three welders and one trades assistant through the hazard register. The team identifies that today's task — orbital GTAW butt welds on 50 mm sanitary tube — sits in a confined corner with limited natural ventilation, elevating Cr VI accumulation risk. Following the controls hierarchy in the document, the supervisor confirms substitution is already in place (GTAW over SMAW), then deploys two Nederman FumeEater portable LEV units positioned 250 mm from each arc, verifying capture with a vane anemometer reading 0.6 m/s. PAPR units with TH3 P3 cartridges are fit-checked and the 6 m exclusion barrier erected. All four workers sign on against the SWMS, acknowledging the urinary chromium sample due at week's end. Mid-shift the assistant notices visible fume escaping one capture hood when the welder pivots; using the document's deviation clause the supervisor stops work, repositions the hood, and records the adjustment on the daily SWMS review log before welding resumes. The record is filed for SafeWork audit retention.

Related legislation

• WHS Act 2011 (model)
• WHS Regulation 2025
• AS 1674 — Safety in welding; Welding Fume CoP

Frequently asked questions