Copper-aluminum low temperature solder

Abstract

The invention discloses copper-aluminum low-temperature solder. The copper-aluminum low-temperature solder is an alloy material prepared from Zn, Al, Ag and rare earth metal. In a welding process of the solder, the wettability, the permeability and the liquidity of a welding liquid are good, the bonding strength of the solder and a base material is improved, air holes, sinking and peeling do not occur in the appearance of the welding position, a welded part is good in quality, the rejection rate of the welded part is reduced, the welding efficiency is improved, the production cost is reduced,the high-temperature resistance, the impact resistance and the corrosion resistance are improved, the welding position is not prone to generate cracks in a high-temperature environment or the condition of being impacted by external force, and is not easy to corrode in a corrosive environment, so that the service life of the welded part is prolonged.

Description

technical field [0001] The invention relates to the technical field of low-temperature solder, in particular to a copper-aluminum low-temperature solder. Background technique [0002] Since the price of copper is more than three times the price of aluminum, many manufacturers are making technical changes, replacing the parts that can be replaced by aluminum as much as possible with aluminum, and the irreplaceable parts are still made of copper, so it is necessary to use copper. Aluminum solder welds two materials together, and copper-aluminum solder is a type of material used to solve the problem of copper and aluminum welding. Copper-aluminum solder is a general term for metal alloy materials used to add to welds, surfacing layers and brazing joints. The existing solder used for welding high-pressure pipes for refrigeration and machinery and extended products --- refrigerators, freezers, air-conditioning evaporators, and copper-aluminum materials in condensers is mainly co...

AI Technical Summary

Problems solved by technology

The existing solder used for welding high-pressure pipes for refrigeration and machinery and extended products --- refrigerators, freezers, air-conditioning evaporators, and copper-aluminum materials in condensers is mainly composed of Al, Zn, and Ag. The wettability, permeability and fluidity of the welding liquid are not good enough, the bonding strength between the solder and the base metal is not enough after welding, the appearance of the welding place has obvious pores, depressions and peeling, and the quality of the weldment is poor, with about 15% The defective rate leads to scrapping and rework of weldments, high scrapping rate of weldments, low welding efficiency, and increased production costs. Moreover, the high temperature resistance of the solder is insufficient, and it is easy to peel during high temperature welding. The impact resistance and Insufficient corrosion resistance, prone to cracks when impacted by external forces, easily corroded in corrosive environments, shortening the service life of weldments

[0003] Therefore, the main components of welding between copper and aluminum materials in refrigerators, freezers, air-conditioning evaporators, and condensers for refrigeration and mechanical high-pressure pipes and extension products are Al, Zn, and Ag. When welding, the quality of the weldment is poor, the scrap rate of the weldment is high, the welding efficiency is low, the production cost is high, and the service life of the weldment is short

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