Auxiliary tool for welding thin-wall pipe fitting

The invention provides an auxiliary tool for welding a stainless steel thin-wall pipe fitting, and relates to the technical field of welding equipment, in particular to the auxiliary tool for welding the thin-wall pipe fitting, which comprises a tool main body, the tool main body is supported in a welding part, and the outer part of the welding part is connected with a pressing structure connected with the tool main body. The side wall of the tool body is provided with a ventilation channel extending to a top plate and side plates of the tool body. The supporting block and the blocking piece of the auxiliary tool support and block the inner wall of the welding part, stability and accurate positioning in the welding process are guaranteed, and therefore the welding quality and efficiency are improved. A ventilating duct is arranged on the side wall of the tool main body, and compressed air is sent to a welding part by means of the ventilating duct to help heat dissipation; the pressing structure in the tool bo