The invention relates to the technical field of
welding, in particular to a
welding process method for
dissimilar metal parts. The method is used for
welding a stainless steel workpiece and an aluminum
alloy workpiece or welding a low-
carbon steel workpiece and the aluminum
alloy workpiece and comprises the following steps that a
transition layer is surfaced in a
base metal welding area of a stainless steel base layer through a first welding wire, and electric arcs deflect to the welding wire during welding; a second welding wire is used for
fusion welding between the surfacing
transition layer and the aluminum
alloy base metal, and electric arcs deflect to an aluminum alloy layer during welding; and after welding is completed, a weldment is placed in a heat preservation furnace for heat preservation, and furnace cooling is conducted after heat preservation is conducted for preset time. According to the
welding process method for the
dissimilar metal parts, due to the fact that the
transition layer is welded to the
base metal welding area of the stainless steel base layer in the
welding process and then welded to the aluminum alloy base
metal through the transition layer, the
melting point of the transition layer and the
melting point of the aluminum alloy parent
metal can be kept within the same range, the welding seam components are uniform after welding, and the welding seamcannot be seriously deformed.