Spot welding electrode through the pressure after assemble spare parts, using the electric current through the joint of the contact surfaces and neighboring areas of the resistance welding heat generated. Our spot welding with high production efficiency, low cost, save materials, easy to automated, so point welding machine is widely used for metal processing, construction machinery repair, auto parts, bicycle parts, special-shaped standard parts, handicrafts, electronic components, instruments, electrical switches, cable manufacturing, filter, muffler, metal packaging, chemical containers, screen, net baskets and other metal products industry.