Welding method of copper and copper alloy

Abstract

The invention relates to a welding method of copper and copper alloy, which is characterized in that: by adopting a room-temperature solid phase rolling-bonding mode, an uniform and dense silver-copper alloy layer (2) is bonded to the surface of a metal part (1), and then one surface of the metal part (1) to which the silver-copper alloy layer (2) is bonded is connected with a metal part (3) to be welded; and by heating, when the temperature reaches to the melting point of the silver-copper alloy layer (2), the alloy layer (2) is melted and is adhered to the contacted metal part (3) to complete the welding between the metal part (1) and the metal part (3). According to the welding method, the welding pieces are tightly combined, the defects of missing weld, unsmooth welding surfaces and the like can be overcome, the welding temperature of 200 to 500 DEG C of copper and copper alloy is reduced, and a matrix material still keeps higher physical and mechanical properties. The welding method can be applied to the welding between copper and copper, copper alloy and copper alloy, or copper and copper alloy.

Description

technical field [0001] The invention belongs to the field of metal material processing, in particular to a method for welding copper and copper alloys. It is used for welding between copper and copper, between copper alloy and copper alloy, and between copper and copper alloy. Background technique [0002] Copper and copper alloys have excellent electrical and thermal conductivity, and can be used for soldering and other welding. However, due to the high melting point and easy oxidation of copper and copper alloys, the welding of copper and copper alloys has the following technical difficulties: [0003] (1) High melting point and high thermal conductivity make the welding temperature of copper and copper alloy very high. When using conventional welding process parameters, copper is difficult to melt and cannot be well fused; [0004] (2) The thermal cracking tendency of the welded joint is large. During welding, the copper in the molten pool and the impurities in it form a...

AI Technical Summary

Problems solved by technology

[0003] (1) High melting point and high thermal conductivity make the welding temperature of copper and copper alloy very high. When using conventional welding process parameters, copper is difficult to melt and cannot be well fused;

[0004] (2) The thermal cracking tendency of the welded joint is large. During welding, the copper in the molten pool and the impurities in it form a low-melting eutectic, which makes the copper and copper alloy have obvious thermal brittleness and generate thermal cracks;

[0005] (3) Copper and copper alloy welding are prone to defects of pores, which are much more serious than carbon steel, mainly hydrogen pores;

[0006] (4) Changes in the performance of welded joints, coarsening of grains, decrease in plasticity, decrease in corrosion resistance, etc.

[0007] At present, the welding of copper and copper alloys mainly adopts gas welding, inert gas shielded welding, submerged arc welding, brazing and other methods, but the welding temperature of these welding methods needs to reach the melting point temperature of copper and copper alloys. At high temperatures, copper will soften. , affecting the mechanical properties and mechanical properties of copper and copper alloys

Images