... keyMain Advantage: 1.Portable and light weight.2. The surface of the repaired parts keep in normal temperature during welding ... medium carbon medium, die steel, stainless steel, casting steel, cast iron, cast aluminum, tungsten carbide alloy, and all electrical conductor.4. The ... , side wall or jamb, bottom, deep cavitiy, flat surface, and etc.Three different types of cold welding repairing machine ...