Power sources for MIG welding and associated pieces of equipment, such as wire feed systems, welding guns, leads and connectors all require an electricity supply to operate. Power sources may operate from a three-phase supply, from industrial single-phase supply or even from a 13amp domestic power supply.
It should always be remembered that electric shock can kill.
Due to the potential severity of the hazard, the following is a guide on what to do before any MIG welding is started to reduce the risk of an electrical accident:
- Only qualified personnel should be allowed to install MIG equipment.
- The equipment must be tested to ensure it is operating correctly and safely before being put into service.
During welding the possibility of electric shock is one of the most serious risks encountered by a welder.
Most electrical accidents occur as a result of carelessness, poor workmanship or due to faulty equipment.
The following points provide a guide to what to reduce the risks:
- Welders should not remove panels from a welding power source if it stops working correctly. Touching a lead inside the welding set with the power still on can result in a serious primary voltage shock.
- Never ignore a blown fuse, it is a warning that something is wrong.
The following practice will help prevent electrical accidents:
- When welding is temporarily interrupted welding guns should be placed where they are safe and the gun switch cannot be activated accidentally.