When welding highly conductive (thermal) materials such as copper, tungsten, gold and silver and their alloys, use molybdenum (Mo) and tungsten (W) as electrode materials to obtain good welding, and sometimes, depending on the situation, can also use the outer tantalum copper alloy, tungsten copper alloy, that is, to ensure the welding effect, but also to ensure that the electrode has sufficient hardness at the end, and wear.