Patent ID: 7335849

Claim:
A method of welding a stud made of magnesium or magnesium alloy to a base material made of magnesium or magnesium alloy, comprising: a first step of disposing the stud so as to have a gap in a range of 0.5 to 12 mm between the stud and the base material, the stud having a projection at an end portion thereof; a second step of rapidly lowering the stud; and a third step of rapidly discharging an electric charge stored in a capacitor between the base material and the stud without providing a device to moderate rapid discharge of the capacitor, each having an oxide layer destroyed by the rapid lowering of the stud, forming a non-oxidative atmosphere at an area being welded which isolates the area from the atmospheric air, thereby welding the end portion of the stud to the base material; wherein the discharge of the capacitor is carried out by supplying a pulse signal having a duration of more than 0.1 and equal to or less than 2 seconds to a gate of a thyristor as a signal to start welding, the thyristor serving as a discharge switch of the capacitor.