Cold welding machine is a kind of special welding wire, which uses the high heat energy generated by instantaneous discharge of micro-current to clad the welding wire to the damaged part of the workpiece and weld it firmly with the original base metal. After welding, only a little polishing is needed. Its function is welding. As long as the position is placed correctly, cold welding machine can butt joint thick and thin parts. The effect can refer to the figure below.