This machine can be used to weld low-carbon or non-ferrous metal parts. The welding method can be resistance butt welding or flash butt welding. The weldment is placed horizontally, the left fixture is fixed, and the right fixture can be moved. A copper electrode isinstalled on the fixture. The copper electrode is connected to the copper bus of the secondary winding of the welding transformer, and the copper electrode is cooled by water. The structure of the fixture can ensure that the weldments of the shape of rods, plates, belts and rings are firmly clamped.