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Silver-free copper based solder and preparation method thereof

A technology of silver-copper and brazing material, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of high cost, high manufacturing cost, and expensive silver-based brazing material, and achieve uniform distribution, overcoming over-burning, and excellent The effect of wetting and spreading

Inactive Publication Date: 2013-01-09
佛山市泓实机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high price of silver-based solder, based on the calculation of the annual production of only 100 million compressors in China, the cost of high-silver solder consumption is about 6.3 yuan / set × 100 million sets = 630 million yuan, and the price of silver has been rising in recent years , leading to high manufacturing costs

Method used

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  • Silver-free copper based solder and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] First, fully melt 62Kg of Cu, 2Kg of Sn, 2Kg of Mn, 1Kg of In and 1Kg of other trace elements at a melting temperature of 1500°C and keep it warm for 2 hours to obtain an intermediate alloy; secondly, cool the above solution to 1100°C , add 32Kg of Zn into the above alloy solution, fully stir and keep warm for 0.5 hours, then pour it on a steel grinding tool, and cool it naturally to make an ingot; finally, the prepared ingot is extruded and drawn , that is, the required solder wire is obtained.

Embodiment 2

[0036] First, fully melt 63Kg of Cu with 2Kg of Sn, 2Kg of Mn, and 1Kg of In at a melting temperature of 1500°C and keep it warm for 2 hours to obtain an intermediate alloy; secondly, cool the above solution to 1100°C, and 32Kg of Zn Add it into the above alloy solution, stir it well and keep it warm for 0.5 hours, then pour it on a steel mold and cool it naturally to make an ingot; finally, the prepared ingot is extruded and drawn to obtain the required brazing wire.

Embodiment 3

[0038] First, fully melt 56Kg of Cu, 2Kg of Sn, 2Kg of Mn, 1Kg of In and 1Kg of other trace elements at a melting temperature of 1500°C and keep it warm for 2 hours to obtain an intermediate alloy; secondly, cool the above solution to 1100°C , add 38Kg of Zn into the above alloy solution, fully stir and keep warm for 0.5 hours, then pour it on the steel grinding tool, and cool it naturally to make an ingot; finally, the ingot made by extrusion, drawing , that is, the required solder wire is obtained.

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Abstract

The invention relates to a silver-free copper based solder and a preparation method thereof, particularly to the silver-free copper based solder for soldering of compressor case covers and copper tubes. The silver-free copper based solder comprises, by weight, 56-68% of Cu, 29-38% of Zn, 0.5-8% of Sn, 0.5-8% of Mn, 0.1-2% of In and other microelements. The preparation method includes fully melting the Cu, the Sn, the Mn, the In and the other microelements to obtain a master alloy; adding Zn into the cooled master alloy with full stirring; taking the alloy out of a furnace; preparing an ingot through pouring; and preparing the ingot into solder wires through extrusion and drawing. The silver-free copper based solder and the preparation method thereof have the advantages that the soldering temperature is 815-865 DEG C and satisfies the process requirement, high silver based solders can be replaced, the cost is low, and the metallographic grain size after welding is low.

Description

technical field [0001] The invention relates to a silver-free copper-based solder used for brazing and a preparation method thereof, in particular to a silver-free copper-based solder used for brazing a compressor housing cover and a copper tube. Background technique [0002] In recent years, dissimilar metal brazing applications have become increasingly widespread. However, due to the great difference in the physical and chemical properties of different materials, especially their different thermal expansion coefficients, during the cooling process after welding, the shrinkage of different materials is inconsistent, resulting in deformation stress. If the weld is not strong enough to overcome the deformation stress, it will crack the weld and cause the compressor to leak. [0003] Especially for the welding of air conditioners, refrigerators and other compressor shell covers and copper pipes, in view of the internal pressure of the compressor when it is used, the quality r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
Inventor 葛红旗王晓彦王彩英申阳
Owner 佛山市泓实机械制造有限公司
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