Novel welding device

The utility model provides a novel welding device. An ultrasonic impact device for aligning with high-temperature weld metal which is solidified and of which strength is not restored yet on a workpiece for ultrasonic impact is arranged behind a welding gun body, so that the ultrasonic impact device and the welding gun body can synchronously move. In the welding process, ultrasonic frequency impact is applied to the high-temperature weld metal which is solidified and of which the strength is not restored yet at the certain position behind a molten pool and in the thickness direction of the welded workpiece, through the excitation force function of ultrasonic, metal in a condensation and shrinkage state is impacted to generate plastic extension to compensate compression plastic strain generated in the heating process, and therefore welding deformation is reduced. The structure of the weld metal can be refined, the crystalline direction of crystal particles can be changed, and the structure is more uniform. Comp