Protection structure for titanium alloy assembly spot welding

The utility model discloses a protection structure for titanium alloy assembly spot welding. The protection structure comprises a mounting side plate, a plurality of clamping grooves are respectively formed in the opposite sides of the pair of mounting side plates; a cover plate is arranged between the clamping grooves in the top. A filter screen is arranged between the clamping grooves in the bottom; an air duct is formed between the cover plate and the filter screen; one end of the air duct is closed, and the other end is provided with a welding opening; a base plate is arranged at the welding opening; the base plate is movably arranged in the clamping groove; and the base plate can shield the welding opening. According to the protection structure for titanium alloy assembly spot welding, the backing plate is arranged on the back face of the weldment, during welding, the backing plate capable of moving on the back face can conveniently play a role in local gas protection, air is blocked, and the welding qua