... products, machine spare parts and other tools.2. Suitable defect: Pin holes, gas hole, burring, flash, bump, scuffing, edge chipping ... process:Welding examples: 1. Corner flashes, holes, pin holes, foundry parts2. Weld big machine holes, small defects, like machine guide ... track, big mould, 3. Comparsion between TIG welder & cold welder welding effect: pin hole repair machine, weld ...