Welding Safety, Health, and Environment
This domain tests how you recognise welding hazards and apply controls that meet workplace safety, health and environmental requirements. Questions often combine PPE, fume, fire, electricity and confined-space controls, so link each control to the hazard it addresses.
Core controls
- Use a hot-work permit where required, clear combustibles, use fire blankets and a fire watch.
- Extract fume at the arc; general ventilation alone is weak for welding fume. Wear the respirator specified by the risk assessment, not instead of extraction.
- Inspect electrode holders, leads and return clamps; keep insulation dry and the work return close to the weld.
- Secure cylinders upright; keep oil and grease away from oxygen; fit flashback arrestors.
- In confined spaces, test the atmosphere, isolate energy, and control entry and rescue.
Worked example
A welder must repair galvanised steel inside a workshop bay. The bay has open doors but no local exhaust. Reasoning: zinc oxide fume can cause metal fume fever; open doors are not a measured control. The correct answer is to use local fume extraction at the arc, keep the head out of the plume, wear the specified respiratory protection, and follow the hot-work permit. If the job were in a tank, it would also need confined-space entry controls and atmospheric testing.
Traps
Do not treat a respirator as a substitute for engineering controls. Do not assume a fire watch ends when the arc stops; hot slag can ignite later. Do not use oxygen to blow dust off clothing. Do not ignore electrical damage because the arc still strikes.