... chipping, crackle, abrasion, wear and tear, miscalculation in manufacture repair metal tools/ better than Spot welder, Arc welder / cold welder ... dies, metal products, machine spare parts and other tools.2.Suitable defect can repair: Pin holes, gas hole, burring, flash, ... , flat surface, and etc.Welding part:Welding application: repair metal tools/ better than Spot welder, Arc welder / cold welder