Butt spot welding heads Is it divided into upper and lower parts. When welding, the welded object is located in the center of the upper and lower parts. Current passes through the welded object and generates heat on the welded object, Sometimes heat occurs primarily through the contact surface of the welded object and the welding head. This depends on which part of the current loop has a large resistance. Micro spot welding head The micro spot welding head is the welding head corresponding to the microelectronic spot welding machine. Its characteristic is that the welding head and the welding machine have now formed a loop. After the current passes through this loop, the heat is generated at the high end of the welding head. The welding head actively generates heat, while the welded object does not actively generate heat.