Wire-submerged brazing processing method of heat exchanger for large automobile

The invention relates to the field of machining, in particular to a wire-submerged brazing processing method of a heat exchanger for a large automobile. The method comprises the following steps: processing a weldment, wherein a pipe plate and a tip are welded by dissimilar materials; adopting a copper alloy welding wire gas welding method to weld the pipe plate and the tip in advance to ensure the sealing and pressure requirements of the weldment because the matching size is larger; forming a hole in the pipe plate; carrying out linear shifting dividing to process a drill jig through a universal indexing head and a spindle change gear method on a milling machine; adopting a rolling clamp to reduce a friction coefficient between a clamp and an operating surface of the drilling machine when a hole in the ordinary drilling machine by the drill jig is clamped by a composite drill bit, a guide reamer on the drill jig and a tube plate. The processing method provided by the invention is simple in processing process and low in equipment requirements, the production efficiency and processing quality of a work-piece can be improved, and the production cost and labor intensity of a worker can be reduced.