Finished square rectangular pipe welding backing forming device

The utility model discloses a finished square rectangular tube welding backing forming device which comprises a base and further comprises a forming mechanism, the forming mechanism for stamping production of a welding backing is installed on the top of the base, and the forming mechanism comprises a lower die holder, a die cavity, a fixed seat, a movable seat, a limiting plate, a threaded hole, a screw rod, a rotating ring and a hand wheel. A die cavity for gasket forming is formed in the lower die base, a fixing base is installed at one end of the lower die base, when the screw rod is screwed, the position of the movable base is adjusted to drive the limiting plate to move in the die cavity, the distance between the limiting plate and the end of the inner wall of the die cavity is adjusted, and then the length of a gasket produced through stamping is adjusted. The production requirements of gaskets of different specifications can be met, the structure is simple, safety and reliability are achieved, operatio