Welding tool for automobile aftertreatment SCR (Selective Catalytic Reduction) assembly

The utility model discloses an automobile post-processing SCR assembly welding tool which comprises a bottom plate, a profiling supporting block mechanism is fixed to one side of the top end of the bottom plate, a sensor positioning mechanism is fixed to the other side of the top end of the bottom plate, and barrel pressing mechanisms are fixed to the positions, located on the two sides of the sensor positioning mechanism, of the bottom plate. A left end cover positioning mechanism is fixed to the side, located on the sensor positioning mechanism, of the bottom plate, an injection base positioning mechanism is fixed to the middle of the top end of the bottom plate, and an air inlet assembly positioning mechanism is fixed to the other side, located on the left end cover positioning mechanism, of the bottom plate. According to the embodiment of the utility model, the semicircular profiling positioning block of the positioning mechanism for the air inlet assembly of the eccentric end cover is matched with the su