The tool head is mainly composed of four parts: welding head, anvil connecting block, anvil top block and polymerization module. When welding, align the wires vertically and tightly against the anvil connecting block. After the foot switch, the polymerization module moves towards the anvil top block, and at the same time, the anvil connecting block moves down together with the anvil top block to tighten the wire. Pressed into the welding area, the welding head vibrates, transferring energy to the copper wires, thereby welding the wire bundles together. During welding, except for the vibration of the welding head, the other tool heads are stationary. After the welding is completed, the polymerization module is retracted, the anvil top block is retracted (XL machine), and the anvil connecting block is raised at the same time, so that the wire harness can be taken out.