Cobalt-Containing Alloy Welding & Cutting SWMS
Welding, cutting, and grinding cobalt-containing alloys including stellite, tool steel, and hard-metal components. Respiratory sensitisation and carcinogen controls.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Welding, oxy-cutting, plasma cutting, and grinding of cobalt-containing alloys such as Stellite hardfacing rods, tungsten carbide tooling, and cobalt-chromium tool steels releases respirable cobalt particulate and fume that IARC classifies as Group 2A (probably carcinogenic to humans) when combined with tungsten carbide. Cobalt is also a potent respiratory sensitiser causing hard-metal lung disease and occupational asthma at exposures well below the workplace exposure standard of 0.02 mg/m³ (inhalable). Under WHS Regulation 2025 Part 4.1, any work generating airborne contaminants above the WES, or involving a Schedule 14 carcinogen-equivalent process, requires documented risk assessment, air monitoring, and health surveillance. A Safe Work Method Statement is mandatory because this work combines hazardous chemical exposure, hot work, confined or semi-enclosed fabrication environments, and the legal duty to eliminate or minimise exposure so far as is reasonably practicable. This SWMS structures hazard identification, hierarchy-of-control selection, atmospheric monitoring triggers, and worker consultation for cobalt alloy fabrication tasks across engineering workshops, mining maintenance bays, and on-site repair scopes.
Hazards identified
7 hazards covered, sorted by priority.
Hard-metal lung disease, interstitial fibrosis, and irreversible diffusion impairment from cumulative cobalt deposition in alveolar tissue
IARC Group 2A carcinogen exposure increasing lung cancer risk and triggering mandatory health surveillance under Schedule 14
Occupational asthma, permanent airway hyper-reactivity, and Comcare-recognised permanent impairment ending welding career
Carcinogenic Cr(VI) inhalation, nasal septum ulceration, and dermatitis with WES of 0.05 mg/m³ readily exceeded
Photokeratitis, retinal burns, and chronic skin photodamage where shade-rated screens or filters are inadequate
Allergic contact dermatitis, cobalt sensitisation, and systemic absorption confirmed by elevated urinary cobalt biomarkers
Fire, deflagration, or burns where hot work permit and atmospheric testing are bypassed during cobalt cutting tasks
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Specify pre-machined cobalt components or laser-clad replacements procured off-site so no in-house grinding or hardfacing welding is required on this project.
- 2Elimination — Schedule any unavoidable cobalt hardfacing into a dedicated isolated fabrication cell during off-shift hours to remove bystander exposure entirely.
- 3Substitution — Substitute nickel-based or iron-based hardfacing alloys (e.g. Inconel 625 overlay) where wear specification permits, reducing cobalt content below sensitisation threshold.
- 4Substitution — Replace dry grinding with wet abrasive cutting using flood coolant to suppress respirable cobalt-tungsten carbide dust at source.
- 5Engineering — Install on-torch fume extraction (Nederman FE 840 or equivalent) capturing 95% at the arc, ducted to HEPA-filtered LEV rated for metal fume.
- 6Engineering — Enclose grinding stations in down-draught booths with H14 HEPA filtration, verified quarterly against AS 1668.2 capture velocities of 0.5 m/s minimum.
- 7Administrative — Conduct static and personal air monitoring per AS 3640 every six months and after process change; trigger Tier 2 controls if results exceed 50% of 0.02 mg/m³ WES.
- 8Administrative — Enrol all exposed workers in health surveillance per WHS Regulation 2025 Schedule 14 including baseline and annual spirometry, chest imaging, and urinary cobalt biomonitoring.
- 9PPE — Issue PAPR with P3 particulate filters (minimum APF 50) for all cobalt welding, cutting, and grinding; half-face P2 is insufficient given sensitisation potency.
- 10PPE — Provide chemical-resistant nitrile gloves, FR coveralls laundered on-site, and dedicated change/shower facilities preventing take-home cobalt contamination per AS/NZS 1715.
Applicable Codes of Practice
Imposes the duty to maintain cobalt exposure below WES 0.02 mg/m³, conduct air monitoring, and provide health surveillance for Schedule 14 hazardous chemicals.
Sets benchmark engineering controls including on-torch LEV, fume capture velocities, and respiratory protection selection specific to alloy welding fume.
Mandates fit-testing, APF calculation, and PAPR selection criteria required because cobalt fume exceeds half-face respirator protection capacity.
Specifies performance requirements for P3 particulate filters and PAPR units used to control respirable cobalt and tungsten carbide aerosols.
High-Risk Construction Work triggered
Not classified as HRCW under Schedule 1, however Part 4.1 hazardous chemical duties apply: PCBU must consult workers, maintain monitoring and health surveillance records for 30 years, with penalties substantial and indexed; current maximum follows the prevailing WHS schedule.
Who this is for
- →Boilermakers and welders on mining maintenance scopes
- →Engineering workshop supervisors fabricating hardfaced components
- →Tooling technicians grinding tungsten carbide inserts
- →WHS managers overseeing fabrication and hot work permits
What you receive
- ✓Editable DOCX template — Microsoft Word compatible
- ✓State-specific WHS legislation schedule (NSW/VIC/QLD/SA/WA/TAS/NT/ACT)
- ✓Hazard register with risk ratings + hierarchy-of-control mapping
- ✓Worker sign-on register, pre-start checklist, and incident escalation flow
Worked example
At a regional heavy-equipment maintenance workshop, a boilermaker is assigned to apply Stellite 6 hardfacing overlay to a dragline bucket lip during a planned shutdown. At the 6:30 am pre-start, the leading hand opens this SWMS on the workshop tablet and walks the three-person crew through the hazard register. The crew identifies that grinding the worn surface before overlay deposition is the highest cobalt-tungsten carbide dust generator, so they confirm the wet-grinding substitution control and verify the flood coolant reservoir is filled. The leading hand checks that the down-draught booth LEV reads above 0.5 m/s on the magnehelic gauge and that the on-torch extraction nozzle is positioned within 75 mm of the arc. Each welder collects a fit-tested PAPR with fresh P3 cartridges from the respirator cabinet, signs the SWMS sign-on register, and confirms current health surveillance status. Two hours into the task, a junior welder notices the LEV gauge has dropped below the trigger threshold because a filter is loading. Following the SWMS escalation step, work stops, the filter is changed out, and the resumption is recorded against the SWMS revision log. End-of-shift, contaminated coveralls go to the on-site laundry rather than home, closing the take-home contamination control loop.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS 1674 — Safety in welding; Welding Fume CoP