Shell welding tool

An outer shell positioning block and a clamping mechanism are arranged on the periphery, corresponding to an outer shell, of a tool table respectively, a first supporting frame and a positioning plate are arranged corresponding to an air inlet pipe, and a second supporting frame is arranged corresponding to a support. The first supporting frame is connected with a clamp through a third air cylinder. The shell positioning block and the clamping mechanism are matched to position the outer shell, the air inlet pipe is matched and positioned through the clamp and the positioning plate, the support is positioned through the second supporting frame, the positioning precision is high, the size precision of a product is easier to control, size deviation is not prone to being generated, the product consistency is higher, follow-up assembly of the shell is guaranteed, and the production efficiency is improved. And the measuring and positioning procedures are saved, the measuring time is saved, and the welding efficienc