Copper-base alloy tin solder and its use method

Abstract

The invention discloses a copper-based alloy solder comprising copper, phosphorus, tin and palladium. The mass percentage and the proportion of each composition are as follows: phosphorus, 0.1 percentto 0.3 percent; tin, 4 percent to 12 percent; palladium, 0.05 percent to 0.2 percent; the remaining is copper and inevitable impurities. The operation method of the copper-based alloy solder is thatthe copper-based alloy solder is used for welding the suction pipes of air conditioners and refrigerators and the exhaust pipes of air conditioners and refrigerators; the welding adopts gas-protectingwelding. The tin and palladium are added to the copper-based alloy solder, on one hand the wetting property, the spreading and sealing properties of alloy materials are improved, and on the other hand alloy grains is refined, thereby leading to compact welding seams, high strength of mechanical property, good welding quality and low cost. The copper-based alloy solder of the invention adopts themethod of welding the suction pipes and the exhaust pipes of the compressors of air conditioners and refrigerators in a gas-protecting state to get non-pickling welding seams, thus saving environmentgovernance cost.

Description

technical field [0001] The invention relates to a brazing material and its application method, more specifically a copper-based alloy solder and its application method. It belongs to the technical field of new materials. Background technique [0002] For example, in the refrigeration industry, copper and carbon steel are brazed for air conditioners, refrigerator compressors, especially the suction pipes and exhaust pipes of refrigerator compressors. At present, BAg30CuZnCd or Bag45CuZn solder is generally used for welding. The welding method is flame or high-frequency welding, and the surface of the workpiece is seriously oxidized after welding by this method. On the other hand, the silver content of BAg30CuZnCd or Bag45CuZn solder is 30% silver to 45%, and the price of silver has risen from 1300 yuan / kg in 2000 to the current 4800 yuan / kg. The cost of copper pipes and post-welding environmental treatment is about 4.5 yuan / piece of RMB, and flame or high-frequency welding ...

AI Technical Summary

Problems solved by technology

On the other hand, the silver content of BAg30CuZnCd or Bag45CuZn solder is 30% silver to 45%, and the price of silver has risen from 1300 yuan / kg in 2000 to the current 4800 yuan / kg. The cost of copper pipes and post-welding environmental treatment is about 4.5 yuan / piece of RMB, and flame or high-frequency welding is used during welding, and pickling is required after welding, which has a certain impact on the environment and is difficult to meet the RoHS directive officially announced by the European Union ( Requirements of the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment)