Welding process of nodular cast iron traction motor for rail transit

The invention discloses a welding process of a nodular cast iron traction motor for rail transit. The welding process comprises the following steps of: 1) cleaning stainless steel at a position where a junction box is welded on a traction enclosure by using alcohol before welding; (2) temperature control is conducted on the welding room through an air conditioner and a heating device; (3) the ferronickel welding rod is put into a heating furnace to be preheated to 180 DEG C; measuring by using a contact type thermodetector; (4) flame preheating is conducted on the position, where the junction box is welded, of the traction machine shell to 180 Measuring by using a contact type thermodetector; (5) fixing the junction box on the traction machine shell by using screws and then welding, and after repeated experiments, welding by using a ferronickel welding rod OK92.58 imported from Issa; better matching performance with two kinds of base metal is achieved; the length of a rivet welding spot is 3 centimeters; acco