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Braze-welding method using two-stage contact reaction of aluminum alloy

A contact reaction and brazing method technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of difficult to control welding accuracy, low welding rate, etc., and achieve beautiful molding, uniform thickness and high welding accuracy. Effect

Inactive Publication Date: 2009-11-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a two-stage contact reaction brazing method for aluminum alloys in order to solve the problem that the existing welding method is difficult to control the welding accuracy and the welding rate is low

Method used

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  • Braze-welding method using two-stage contact reaction of aluminum alloy

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specific Embodiment approach 1

[0009] Specific Embodiment 1: The method of two-stage contact reaction brazing of aluminum alloy in this embodiment is as follows: 1. The aluminum alloy with the Zn / Cu composite layer preset and the parts to be connected are composed of the workpiece group to be connected, wherein the aluminum alloy to be connected The connection surface is sequentially plated with a 2μm-3μm thick Zn layer and a 6μm-10μm thick Cu layer; 2. Put the workpiece group to be connected in a brazing furnace, and the vacuum degree is not lower than 1.33×10 -3 Pa or high-purity argon gas protection with a purity concentration of 99.999% (volume), and a connection surface pressure of 0.02 MPa, heat for the first time to 400 ° C ~ 420 ° C, hold for 10 min ~ 20 min, and then heat the second time to 520 °C ℃~540℃, keep warm for 20min~60min, stop heating, then cool down to 200℃~50℃ with the furnace, then take out the connected workpiece group, cool to room temperature in the air, and brazing is completed.

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specific Embodiment approach 2

[0011] Embodiment 2: This embodiment is different from Embodiment 1 in that the aluminum alloy described in step 1 is 6063 aluminum alloy or 7005 aluminum alloy. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the parts to be connected in step 1 are 6063 aluminum alloy, 7005 aluminum alloy, red copper or aluminum borate whisker-reinforced aluminum matrix composite material; wherein 6063 aluminum alloy The surface to be connected of the alloy is plated with a 2μm-3μm thick Zn layer and a 6μm-10μm thick Cu layer in sequence, and the 7005 aluminum alloy is plated with a 2μm-3μm thick Zn layer and a 6μm-10μm thick Cu layer in sequence. Floor. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a braze-welding method, in particular to a braze-welding method using a two-stage contact reaction of an aluminum alloy. By taking a Zn / Cu compound intermediate layer as the liquid-phase generating source, the invention solves the problems that the welding precision is difficult to control and the welded rate is low in the existing welding method. The method of the invention comprises the following steps: forming a workpiece group to be welded which is composed of an aluminum alloy, on which a Zn / Cu compound layer is pre-formed, and a piece group to be welded, and placing the workpiece group to be welded on a brazing furnace; heating and keeping warm under the condition that the vacuum degree is no lower than 1.33*10 Pa, or the pressure of the connecting surface is 0.02MPa under the protection of argon with the purity as high as 99.999% (volume); further heating and keeping warm; stop heating, and cooling with the furnace to the temperature of 200 to 50 DEG C; then, taking out the welded workpiece group to complete the braze-welding process. The connector welded by the method of the invention has the advantages that the parent metal strength of the aluminum alloy is above 90% and the welded rate is above 98%.

Description

technical field [0001] The present invention relates to a brazing method. Background technique [0002] At present, the commonly used welding methods involving aluminum alloys mainly include fusion welding, resistance spot welding and roll welding, diffusion welding, brazing, and contact reaction brazing methods. However, the biggest problem of fusion welding is that it is difficult to achieve high-precision connection, and the welding position is often limited by the structure, and it is not suitable for large-area connection applications; resistance spot welding and seam welding require huge and complicated equipment. It is only used for welding aluminum alloy thin plates with a thickness of less than 4mm. It is difficult to weld thick plates; when diffusion welding is used, due to the low melting point of aluminum alloys, there is no solid phase transition and the surface is covered with dense and stable Al. 2 o 3 Oxide film, so the welding rate of the solid-phase diffu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/20
Inventor 曹健崔红军冯吉才张丽霞
Owner HARBIN INST OF TECH
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