Make certain that the electrode holder and all electrical connections and cables are properly insulated. Check to see that the welder is properly grounded. Do not dip the electrode holder in water to cool it because this practice may result in electrical shock. Never weld in damp locations because of the shock hazard. When operating a MIG welder, never touch and electrical connection, bare wire, work, or a machine part which may cause electrical shock.
Gloves help to insulate against possible shock.
When TIG welding never touch the tungsten electrode with the filler rod. The tungsten electrode is charged with electric current which may charge the filler rod and shock the person welding. The current potential at the tungsten electrode is at the arc voltage level or higher. A shock from the electrode could be deadly. Wear hearing protection with TIG pulsed power and high current settings.