Generally, the high temperature generated by the welding head in high-speed welding will make the length of the welding head become longer and affect the welding quality. The flange fixed by the hard joint welding head is designed on the joint of the welding head. Even if the size change of the welding head is reduced to a minimum in high-speed welding, the relative welded product will be more stable. Application: thin material welding, high-speed production automation machine.