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Copper and stainless steel brazing process

A brazing process, stainless steel technology, applied in the direction of welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of complex welding process, high production cost, high energy consumption, etc., to achieve beautiful appearance, high production pass rate and short production time short effect

Inactive Publication Date: 2012-07-04
刘字冬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention designs a brazing process for welding copper and stainless steel, the purpose of which is to solve the complex welding process of the joints of stainless steel and copper dissimilar metals in the radiator system of automobiles and household air-conditioning radiator systems. To solve the problems of high cost and high energy consumption, provide a copper and stainless steel dissimilar metal brazing process that meets the international brazing standards, meets the quality design requirements for the inlet and outlet water pipe joints of automobile cooling systems and household air-conditioning systems, has reliable methods, and has a high welding yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The brazing process for welding copper to stainless steel involves the following steps:

[0032] 1) Pre-welding treatment: To clean the water pipe joint parts that need to be welded, first put the water pipe joint parts that need to be welded into the cleaning solution with metal surface degreasing agent, heat for ultrasonic cleaning, and then use clean water Rinse and remove to dry. The ultrasonic cleaning time is 30 minutes, and the drying temperature is 40°C.

[0033] 2) Joint assembly: Put the ring-shaped copper-based solder and stainless steel pipe fittings on the outside of the copper pipe fittings in turn, the gap between the copper pipe fittings and the stainless steel pipe fittings is 0.08mm; ensure the flatness of the contact surface of the copper fittings and stainless steel fittings so that the weld seam There is no gap in the contact part when it is assembled with the ring solder.

[0034] 3) Add solder and brazing flux; apply flux evenly on the welds of ...

Embodiment 2

[0039] The brazing process for welding copper to stainless steel involves the following steps:

[0040] 1) Pre-welding treatment: To clean the water pipe joint parts that need to be welded, first put the water pipe joint parts that need to be welded into the cleaning solution with metal surface degreasing agent, heat for ultrasonic cleaning, and then use clean water Rinse and remove to dry. The ultrasonic cleaning time is 60 minutes, and the drying temperature is 60°C.

[0041] 2) Joint assembly: Put the ring-shaped copper-based solder and stainless steel pipe fittings on the outside of the copper pipe fittings in turn, the gap between the copper pipe fittings and the stainless steel pipe fittings is 0.18mm; ensure the flatness of the contact surface of the copper fittings and stainless steel fittings so that the weld seam There is no gap in the contact part when it is assembled with the ring solder.

[0042] 3) Add brazing filler metal and brazing flux; evenly smear flux on...

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Abstract

The invention relates to a copper and stainless steel brazing process, which is characterized by comprising the following steps of 1) processing before brazing; 2) assembling joints; 3) adding brazing filler metal and brazing flux; 4) brazing; and 5) processing after brazing. Since silver-base brazing filler metal is replaced by copper-base brazing filler metal in the process, manufacturing cost is reduced and noble metal resources are saved greatly. Brazing is realized in the air without protective gas so that expenses for consumption of nitrogen gas, argon gas and the like are reduced. Due to the fact that the technology of brazing in a protective gas furnace or vacuum furnace is replaced by the technology of brazing by induction heating, electric power is saved. Accordingly, the copper and stainless steel brazing process is reliable, requires short production time, enables pass rate to be high, saves energy sources and is suitable to be used for batch production.

Description

technical field [0001] The invention relates to a welding technology used for dissimilar metals, in particular to a welding process for copper and stainless steel dissimilar metal inlet and outlet water pipe joints. Background technique [0002] Two different metal inlet and outlet pipe joints, copper and stainless steel, are important components in the radiator system of automobile water tanks and the radiator system of household air conditioners, and their quality has an important impact on the normal operation of the radiator system. [0003] The two metal materials, copper and stainless steel, are obviously different in physical properties and chemical composition. The melting point and thermal conductivity coefficient of the two metals are quite different, which has always brought great benefits to the manufacture of such inlet and outlet pipe joints. process difficulty. Contents of the invention [0004] The present invention designs a brazing process for welding...

Claims

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Application Information

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IPC IPC(8): B23K1/002B23K1/19B23K1/20
Inventor 刘字冬赵相记李进世
Owner 刘字冬
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