Rear support welding tool for forearm of excavator

The utility model provides a welding tool for a forearm rear support of an excavator, and belongs to the technical field of machining. Comprising a bottom plate and further comprises a sleeve supporting piece, a supporting plate, a first baffle, a second baffle, a fourth baffle and a third baffle which are perpendicularly and fixedly connected with the bottom plate. Inverted isosceles trapezoid grooves are formed in the upper portions of the two symmetrically-arranged sleeve supporting pieces, and the grooves are used for containing sleeves of rear supporting workpieces. The supporting plate is provided with a positioning bolt used for abutting against the end face of a sleeve of a rear supporting workpiece. The first baffle and the second baffle abut against the side face of a side plate of the rear supporting workpiece, and the fourth baffle abuts against the end face of the side plate of the rear supporting workpiece. The third baffle abuts against a yoke plate of the rear supporting workpiece. According t