When the welding wire is repaired, the heat affected zone is very small and no internal stress is generated. It is very suitable for casting defects, surface damage, wear and repair of mold defects. Why is the temperature of the welding wire so low, because the welding wire is in a state of micro-melting when it melts, and when it comes into contact with the workpiece, a small part of the workpiece is quickly formed by external force to move the workpiece up. Since the melting is small, the workpiece is much larger than that. The temperature soon dissipated. The temperature of the welding wire will not continue to rise until it is full of redness, and its resistance to red is superior. Compared with ordinary welding wire, if the duration is too long, there will be a serious redness of the welding wire and a blackening of the welding spot. Even if it can be welded, when welding, it is prone to oxidation, dregs, welding is not high, and affect its subsequent processing.