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Copper, aluminium, stainless steel composite brazing method

A technology of stainless steel and stainless steel sheets, applied in welding equipment, high-frequency current welding equipment, metal processing equipment, etc., can solve problems such as not being able to meet the use requirements, and achieve the effect of ensuring quality

Inactive Publication Date: 2005-07-20
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no brazing material and method suitable for copper-aluminum direct composite brazing. Although tin-based soldering materials are also used to braze copper-aluminum, the service temperature of brazing products generally reaches 400-600 ° C, which is far from It is higher than the melting point of tin-based soldering materials and cannot meet the requirements of use. Therefore, it has no practical significance for tin-based soldering materials to be used for brazing copper-aluminum composite products used at high temperatures

Method used

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  • Copper, aluminium, stainless steel composite brazing method
  • Copper, aluminium, stainless steel composite brazing method
  • Copper, aluminium, stainless steel composite brazing method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Using the present invention as figure 2 , image 3 As shown, 0.2mm stainless steel sheet is used as the transition layer, the thickness of the brazing copper sheet is 0.5mm, the thickness of the aluminum sheet is 3mm, and 200 stainless steel sandwich pans with a thickness of 0.5mm and a diameter of 180mm. The post-welding visual inspection and percussion inspection are all qualified. All dry firing tests were done, 1 weld was cracked, and 199 were qualified. The pass rate is not less than 99%. (The pass rate requirement for brazing stainless steel-aluminum-stainless steel sandwich pans is not less than 98%)

Embodiment 2

[0024] Using the present invention as figure 2 , image 3 As shown, use 0.2mm stainless steel sheet as the transition layer, brazing copper sheet thickness 0.6mm, aluminum sheet thickness 2.4mm, 200 stainless steel sandwich pans with a thickness of 0.6mm and a diameter of 280mm. The post-welding visual inspection and percussion inspection are all qualified. All dry firing tests were done, 2 welds were cracked, and 198 were qualified. The pass rate is not less than 99%.

Embodiment 3

[0026] Adopt the present invention, use 0.3mm stainless steel bottom sheet to make transition layer, brazing copper sheet bag bottom sheet thickness 0.6mm, aluminum plate thickness 3mm, thickness 0.6mm diameter is 200 stainless steel bottom pans of 240mm. After welding, the visual inspection was all qualified, and one product was found to be defective by knocking inspection. 199 workpieces were dry-fired, 3 welds were cracked, and 196 were qualified. The pass rate is not less than 96%. (The qualification rate of the brazing stainless steel-aluminum-stainless steel clad bottom pan is not less than 98%).

[0027] The present invention adopts the transition layer of stainless steel sheets arranged between copper and aluminum, which can complete the brazing of multiple different metals at one time, with high controllability of product quality and a yield of more than 98%. The cost can be reduced, and the appearance quality of the product can be ensured.

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Abstract

The present invention relates to a copper, aluminium and stainless steel combined brazing method, including the following steps: between copper and aluminium setting a transition layer, the described transition layer is a stainless steel sheet, and its thickness is 0.1-0.5 mm; cleaning copper, aluminium and stainless steel workpieces to be brazed, degreasing, brush-coating two surfaces of aluminium workpiece with potassium fluoroaluminate eutectic brazing flux, spreading aluminium-silicon eutectic brazing filter metal, placing it on the brazed surface of stainless steel workpiece, coating one side surface of transition layer stainless steel sheet with potassium fluoroborate brazing flux, spreading copper-phosphorus base brazing filler metal, placing one surface which is not coated with brazing flux and brazing filler metal on aluminium workpiece with brazing flux and brazing filler metal, then covering them with copper sheet for brazing.

Description

technical field [0001] The invention relates to a metal welding method, in particular to a method for completing composite brazing of copper, aluminum and stainless steel at one time by using a high-frequency induction pressure brazing machine. Background technique [0002] At present, brazing composite metal products such as copper-stainless steel or aluminum-stainless steel with high-frequency induction pressure brazing machine is a very mature technology. The composite brazing products of the above metals have been exported in large quantities in recent years. However, with the diversification and serialization of composite metal products, copper-aluminum-stainless steel composite brazing is required, which involves brazing of two metals, copper-aluminum. However, no brazing materials and methods suitable for copper-aluminum direct composite brazing have been found at present. Although tin-based soldering materials are also used to braze copper-aluminum, the service tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K13/01B23K31/12
Inventor 陈志祥杨凯珍蔡志红蔡沛沛曾燕刘宏江刘凤美
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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