Protective welding device for precise sheet metal parts

The protective welding device for the precise sheet metal part comprises a table body, two sets of sliding grooves for adjustment are formed in the surface of the top end of the table body, sliding blocks for adjustment are installed in the sliding grooves in a sliding mode, lead screws connected with the sliding blocks in a screwed mode are rotatably installed in the sliding grooves, and the lead screws are connected with the sliding blocks in a screwed mode. Two sets of grooves for protection are formed in the surface of the outer side wall of the table body, servo motors A capable of driving lead screws to rotate are assembled in the grooves, a pipe body for supporting is assembled on the surface of the top end of a sliding block, and a branch pipe for adjustment is slidably installed on the inner side of the pipe body. The device solves the problems that when an existing protective welding device is used for clamping precise sheet metal parts needing to be welded, the movement and position relation betwee