Rail Welding (Aluminothermic / Thermite) SWMS
Aluminothermic rail welding — molten metal at >2,500°C, crucible safety, mould installation, post-weld grinding. RCS during grinding cycle. WTIA and AS 1085.20.
SWMS variants reference your state’s WHS legislation. Instant download after payment.
Aluminothermic (thermite) rail welding joins running rails in-track using an exothermic reaction between aluminium powder and iron oxide, producing molten steel in excess of 2,500°C poured into a refractory mould around the rail ends. The work is performed in live or possessed rail corridors, frequently under or adjacent to energised overhead traction, and involves preheating with oxy-LPG torches, crucible tapping, slag handling, and post-weld profile grinding that generates respirable crystalline silica and metal fume. Under WHS Regulation 2025 a Safe Work Method Statement is mandatory because the activity is high-risk construction work (hot work in a transport corridor, work near energised electrical installations, and use of powered mobile plant including hi-rail), and it is concurrently regulated under the Rail Safety National Law and ONRSR-accredited network rules. This SWMS documents the controls required before any portion can be lit, poured or ground.
Hazards identified
7 hazards covered, sorted by priority.
Full-thickness thermal burns, ignition of PPE and ballast fires, permanent disfigurement, fatality from inhalation of vaporised metal
Fatal blunt-force trauma; ONRSR notifiable occurrence; potential prosecution of rail transport operator and PCBU
Electrocution, arc flash burns, cardiac arrest; mandatory isolation breach triggers ONRSR Category A occurrence
Accelerated silicosis, manganism, siderosis, lung cancer; lifetime health monitoring obligation under WHS Reg Part 7.1
Violent ejection of molten metal up to 10 metres, severe burns to crew and bystanders, equipment destruction
Crush injury, run-over, derailment; powered mobile plant incident reportable to regulator and network controller
Lumbar disc injury, shoulder strain, hernia; cumulative musculoskeletal disorder and workers compensation liability
Control measures
Hierarchy-of-controls order: elimination → substitution → isolation → engineering → administrative → PPE.
- 1Elimination — Where alignment permits, substitute aluminothermic field welds with flash-butt welding performed off-track in a controlled depot environment to remove molten metal hazard entirely.
- 2Elimination — Conduct all welding under absolute track possession with traction isolated, earthed and tagged so live-line and live-rail hazards are removed from the work zone.
- 3Substitution — Use low-fume, low-silica thermite portions (e.g. SkV-Elite or equivalent) and resin-bonded grinding discs in lieu of higher-emission consumables to reduce respirable contaminants.
- 4Substitution — Replace petrol-driven rail grinders with battery electric profile grinders to eliminate exhaust CO and reduce noise exposure below the 85 dB(A) action level in AS/NZS 1269.
- 5Engineering — Install pre-heated, factory-sealed single-use moulds and inductively dried crucibles; verify portion moisture with calibrated meter before ignition per WTIA Technical Note 25.
- 6Engineering — Deploy on-tool LEV shrouds extracted to HEPA-filtered vacuum on all grinding equipment to capture RCS at source in accordance with WHS Reg 2025 s49 airborne contaminant limits.
- 7Administrative — Implement ONRSR-compliant worksite protection with handsignaller, lookout-warning system or absolute possession, briefed at pre-start using network operator (ARTC/TfNSW/QR) safeworking forms.
- 8Administrative — Restrict welding to qualified personnel holding current AS 1085.20 / RISI competency, with hot work permit, fire watch maintained 60 minutes post-pour, and exclusion zone of 5m enforced.
- 9PPE — Aluminised primary thermal jacket and spats, AS/NZS 1338.1 shade 5 flip-front face shield, AS/NZS 2210.3 metatarsal boots, and Kevlar-lined heat gauntlets worn for tap and pour cycle.
- 10PPE — P2/P3 powered air-purifying respirator per AS/NZS 1715/1716 during all grinding, supplemented by class 5 hearing protection and Cat 2 arc-rated layer when working within 3m of OHL.
Applicable Codes of Practice
Prescribes procedure qualification, preheat regime, portion selection and post-weld inspection criteria that this SWMS operationalises for each pour.
Mandates a documented SWMS before commencing HRCW including work in road/rail corridor, near energised electrical installations and with powered mobile plant.
Sets WES of 0.05 mg/m³ for RCS and triggers air monitoring, health surveillance and LEV duties during grinding of weld collars.
Requires accredited safeworking, drug/alcohol testing, and competency verification for every worker entering the danger zone for thermite welding.
High-Risk Construction Work triggered
Welding is performed in the live rail corridor between possessions; trains, hi-rail and adjacent road traffic create struck-by exposure for the welding crew.
Overhead traction at 1500V DC or 25kV AC and signalling cables remain within striking distance of welding kit, grinders and rail-end alignment tools.
Hi-rail welding vehicles, road-rail trolleys and rail-mounted grinders are deployed to transport portions, crucibles and crews along the worksite.
PCBU must consult workers, provide SWMS before work starts and retain it for two years (or until incident closure); penalties for non-compliance are substantial and indexed, with current maximums following the prevailing WHS schedule.
Who this is for
- →Rail welders and thermite crew leaders on network projects
- →Track maintenance contractors to ARTC, TfNSW, QR and MTM
- →Rail infrastructure managers and ONRSR-accredited operators
- →Principal contractors on rail renewal and turnout programmes
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
On a Sunday possession of a regional dual-gauge mainline, a four-person thermite crew arrives at the worksite to install three closure welds on a recently destressed CWR section. The crew leader opens this SWMS at the pre-start brief held on the cess, projecting it from a ruggedised tablet. Working down the hazard register, the team confirms the overhead is isolated and earthed (Cat 11), the absolute possession protection officer has issued the worksite protection authority (Cat 14), and the hi-rail Unimog is parked outside the 5m exclusion zone (Cat 15). The crew leader walks each welder through the control hierarchy, signing on to the moisture-check, mould pre-heat duration, and PAPR requirement for the grinding phase. Mid-shift the wind shifts and fine drizzle begins; using the SWMS's environmental trigger clause, the leader pauses work, re-dries the crucible inductively and re-checks portion moisture before the second pour. During grinding, a junior welder is observed without his face seal correctly fitted — the supervisor halts the cycle, references the PPE control line, and refits the PAPR before grinding resumes. The completed sign-on sheet, hot work permit and RCS LEV checklist are uploaded to the network operator's safety portal at end of shift, closing out the SWMS for that worksite.
Related legislation
- WHS Act 2011 (model)
- WHS Regulation 2025
- AS/NZS 3000 — Electrical installations