... wear and tear, miscalculation in manufacture repair metal tools/ better than Spot welder, Arc welder / cold welder XKS-02 ... Normal temperature welding, the structure near the welding point won't change. There is no influence in the performance of mechanic machining. ... or furrow, side wall or jamb, bottom, deep cavitiy, flat surface, and etc.Welding part:Welding application: repair metal tools/ better ...