Welding tool for automobile aftertreatment air outlet silencing assembly

The utility model relates to an automobile after-treatment air outlet silencing assembly welding tool which comprises a cross-shaped bottom plate, and positioning and clamping devices are arranged onthe front portion, the rear portion, the left portion and the right portion of the bottom plate respectively. The positioning and clamping device comprises a first supporting plate, a second supporting plate, a positioning block, a limiting mechanism, an air cylinder and a pressing plate, the first supporting plate is fixedly arranged on the inner side of the bottom plate, and the positioning block is arranged at the upper end of the first supporting plate; a second supporting plate is fixedly arranged on the outer side of the bottom plate, a limiting mechanism is arranged at the upper end ofthe second supporting plate, and the limiting mechanism is matched with the positioning block to limit the workpiece; an air cylinder is arranged between the first supporting plate and the second supporting plate, the bottom o