Welding machining device for universal couplings

The utility model discloses a welding machining device for universal couplings. An adjustable-speed motor is connected with a center shaft, a fork head and a main shaft through belt pulleys, an expansion core shaft is arranged in a hole in the end of the fork head, a first compression bolt is installed in the expansion core shaft through threads, a first compression nut, a first locknut, a gasket and a rubber ring are sequentially installed between the first compression bolt and the expansion core shaft, the fork head is fixed to the center shaft through a second compression bolt, a tightening end cover is fixed to the fork head through screws, a center is sleeved with a positioning sleeve, a taper hole is formed in the inner surface of the expansion core shaft, the taper of the taper hole is two degrees, the tightening end cover provided with a cylindrical groove is arranged between the center and the fork head, and a correcting and straightening device is installed on a guide rail. By the adoption of the welding machining device, it is ensured that the universal couplings are stable in the welding process, welding deformation can be effectively reduced, welding quality is ensured, and radial play eccentricity is made to be smaller than 200 microns; meanwhile, terrible destroy accidents can be avoided, and good economic benefit is achieved.