Abstract: In this paper, a low vacuum EBW method with wire is put forward through many tests according to the features of the welded joint between upper cover and pump wheel of torque converter. It solves the contradiction between welding quality and welding productivity. Influence of some main technological parameters on weld forming, such as electron beam form, focus position, wire feeding direction and angle, electron beam spot position on the weld beam, is also discussed in detail. Through many technological tests on samples and reel parts, the technological methods for guaranteeing the weld quality and its appearance have also been put forward.