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A kind of stainless steel/aluminum alloy dissimilar metal brazing assembly method

A dissimilar metal and aluminum alloy technology, which is applied in the field of stainless steel/aluminum alloy dissimilar metal brazing, can solve problems such as products not meeting the qualified standards for brazing seams, and achieve the effect of quality assurance

Active Publication Date: 2020-12-18
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a stainless steel / aluminum alloy dissimilar metal brazing assembly method, and solve the problem that the product does not meet the brazing seam qualification standard caused by defects such as pores, oxidation, and slag inclusion in brazing question

Method used

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  • A kind of stainless steel/aluminum alloy dissimilar metal brazing assembly method
  • A kind of stainless steel/aluminum alloy dissimilar metal brazing assembly method
  • A kind of stainless steel/aluminum alloy dissimilar metal brazing assembly method

Examples

Experimental program
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Effect test

Embodiment 1

[0118] Embodiment 1: The inner diameter of the groove of the aluminum alloy flange is Φ70mm, and the brazing method of steel / aluminum dissimilar metals is assembled.

[0119] (1) Clean the surface of stainless steel pipe fittings

[0120] First, clean the stainless steel pipe fittings to be brazed after tinning with alcohol and dry them, and then apply a layer of micro-active flux on the surface of the tinning;

[0121] (2) Clean the surface of the aluminum alloy flange tin bath.

[0122] First scrape off the anodized material on the surface of the tin tank of the anodized aluminum alloy flange, then clean the flange with alcohol and dry it.

[0123] (3) Heating

[0124] Heat the brazing furnace to the range of 85-95°C, keep it warm for 1 hour, then put the cleaned flange into the electric furnace for heating, after the solder is melted, take it out of the electric furnace, and then scrape off the flange tin bath A brazing material whose inner surface is partially oxidized ...

Embodiment 2

[0140] Embodiment 2: The inner diameter of the groove of the aluminum alloy flange is Φ320mm, and the brazing method of steel / aluminum dissimilar metals is assembled.

[0141] (1) Clean the surface of stainless steel pipe fittings

[0142] First, clean the stainless steel pipe fittings to be brazed after tinning with alcohol and dry them, and then apply a layer of micro-active flux on the surface of the tinning;

[0143] (2) Clean the surface of the aluminum alloy flange tin bath.

[0144] First scrape off the anodized material on the surface of the anodized aluminum alloy flange tin tank, then clean the flange with alcohol and dry it.

[0145] (3) Heating

[0146] Heat the brazing furnace to the range of 85-95°C, keep it warm for 1 hour, then put the cleaned flange into the electric furnace for heating, after the solder is melted, take it out of the electric furnace, and then scrape off the flange tin bath A brazing material whose inner surface is partially oxidized by hea...

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Abstract

The invention relates to a stainless steel / aluminum alloy special metal brazing assembly-connecting method. The tin-hung surface of a stainless steel pipe fitting is cleared, the surface of a tin-filled trough of an aluminum alloy flange plate is scraped and cleared, then heating and brazing assembly-connecting is conducted, and finally, a product is cleaned. Detecting is conducted to guarantee that the product qualification requirement is met. Scraping treatment is conducted in the heating process after cleaning, then rotating brazing assembly-connecting under guiding of a core shaft is conducted, thus the temperature field difference is decreased, oxide residues are reduced, the precipitation capability of liquid tin brazing seam gas holes is improved, thus in the brazing assembly-connecting process of the stainless steel pipe fitting and the aluminum alloy flange plate, defects such as the gas holes and oxidized slag inclusion are effectively controlled, the qualified rate is significantly increased, and the technological requirement for controlling the product brazing assembly-connecting process and the qualified using requirement of the product are met.

Description

technical field [0001] The invention relates to a stainless steel / aluminum alloy dissimilar metal brazing assembly method, which belongs to the field of welding technology. Background technique [0002] As a tin-lead soldering process of stainless steel / aluminum alloy dissimilar metals, its assembly process has an important impact on stainless steel / aluminum alloy dissimilar metal brazing. [0003] Steel / aluminum welded structures have important applications in industrial sectors such as aerospace, transportation, and defense. However, the connection between the two has always been a technical difficulty in the field of welding. For a long time, a lot of research work has been carried out in the field of steel / aluminum dissimilar metal connections, and engineering applications in non-sealed structures such as automobiles, satellites, high-speed rails, and aircraft have been realized. [0004] In the existing method, a stainless steel / aluminum alloy dissimilar metal conduit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20C25D3/38C25D5/10C25D5/18B23K103/20
Inventor 高凤林孔兆财杨海鑫邹鹤飞王志东陈志凯范波朱平萍黑增民赵凤英
Owner CAPITAL AEROSPACE MACHINERY