Method for overlaying metal ceramic on surface of aluminum alloy through assisting of argon arc welding and self-propagating reaction pressure

Abstract

The invention discloses a technology for overlaying metal ceramic on the surface of aluminum alloy through assisting of argon arc welding and self-propagating reaction pressure. The technology comprises the processes that (1) abrasive blasting, grinding and high-temperature pre-heating are conducted on the aluminum alloy before overlaying; (2) multi-layer argon arc welding is conducted for assisting self-propagating overlaying, and gradient transition of a base body and a coating is realized; (3) hammering while welding is conducted for hot pressing and thermal insulation is conducted after welding. The technology is characterized in that argon arc welding, self-propagating welding and a semisolid metal thixomolding technology are organically combined. Stress-relieved multi-layer overlaying is conducted. Pressurizing while welding is conducted in the overlaying process, therefore, the compactness of overlay claddings is greatly improved and residual stress of the overlay claddings is greatly reduced. The technology has the advantages that the formula of welding rod materials can be adjusted according to needs, alloying processing can be conducted flexibly, energy is saved, the cost is low, and the technology processes are easy to grasp and convenient to control; the bonding strength of the overlay claddings and the base body is high, the texture is compact, the toughness is good, cracks and air holes of the overlay claddings are obviously reduced and the residual stress is low.

Description

Technical field: [0001] The invention relates to a method for argon arc welding assisted self-propagating reaction pressure surfacing welding cermet on the surface of aluminum alloy, and belongs to the technical field of surface engineering. Background technique: [0002] Surfacing welding can achieve complete metallurgical bonding between the coating and the substrate, and is one of the highest bonding strength methods among all surface engineering technologies. In recent years, surfacing cermet repairing and strengthening mechanical parts on ferrous metal surfaces is becoming a new trend in the development of parts life extension technology. However, there is no breakthrough in the technical difficulties of surfacing cermets on aluminum alloy surfaces. Summary of the invention: [0003] The purpose of the present invention is to overcome the above shortcomings and provide a cermet method for argon arc welding assisted self-propagating reaction pressure surfacing welding on alum...