Welding tool for rear installation supporting base of truck body

The invention relates to the technical field of automobile manufacturing, in particular to a welding tool for a rear installation supporting base of a truck body. The welding tool for the rear installation supporting base of the truck body comprises the base, a first air cylinder, a compressing arm, a connection board, a locating base, a second air cylinder, a rotary shaft and a locating pin, wherein the first air cylinder is fixed to the connection board; one end of the compressing arm is in rotary connection with the telescopic end of the first air cylinder; the other end of the compressing arm is fixedly connected with the locating base; the compressing arm is further in rotary connection with the connection board; the second air cylinder is fixed to the base; the telescopic end of the second air cylinder is in rotary connection with the connection board; the connection board is connected with the base through the rotary shaft; the locating pin is located on the connection board. As certain compressing force is exerted on the rear installation supporting base of the single-row truck body, the welding deformation of the rear installation supporting base of the single-row truck body is reduced, the assembly of an assembly shop is improved, and meanwhile through simple and rapid switching, accurate locating and space receding are carried out on third-section longitudinal beams of row-and-a-half truck bodies and double-row truck bodies, and welding is convenient.