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Stainless steel/aluminum alloy dissimilar metal pipeline welding method

A technology of dissimilar metals and welding methods, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve problems such as poor reliability, poor air tightness, and many joint defects, and achieve guaranteed strength and reliability sexual effect

Pending Publication Date: 2022-08-05
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the specific structure, LF6 aluminum alloy and 1Cr18Ni9Ti stainless steel are brazed and welded, but there are problems such as low brazing rate, many joint defects, poor air tightness, and poor reliability.

Method used

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  • Stainless steel/aluminum alloy dissimilar metal pipeline welding method
  • Stainless steel/aluminum alloy dissimilar metal pipeline welding method
  • Stainless steel/aluminum alloy dissimilar metal pipeline welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) At the end of the stainless steel (1Cr18Ni9Ti) tube blank, AgCu alloy (Cu mass percentage 28.1%) wire is selected, and the wire is melted and surfacing on one end of the stainless steel tube blank by argon arc wire filling welding, and the thickness of the surfacing layer is preset. 7-10mm, such as figure 1 ;

[0039] 2) X-ray inspection of stainless steel tube blank surfacing welds is required to meet the corresponding requirements of QJ2865A "Conduit Welding Technical Conditions";

[0040] 3) Machining the stainless steel tube surfacing blank to obtain a finished tube with a slightly smaller diameter, wall thickness and length; such as figure 2 ;

[0041] 4) According to the pipe diameter and wall thickness obtained in the previous step, process the 5A06 aluminum alloy pipe blank with the size as shown in the figure below; such as image 3 ;

[0042] 5) Use high-energy electron beams to weld the preset surfacing end of the finished stainless steel pipeline obt...

Embodiment 2

[0046] 1) At the end of the stainless steel (1Cr18Ni9Ti) tube blank, AgCu alloy (Cu mass percentage 28.1%) wire is selected, and the wire is melted and surfacing on one end of the stainless steel tube blank by argon arc wire filling welding, and the thickness of the surfacing layer is preset. 7-10mm, such as figure 1 ;

[0047] 2) X-ray inspection of stainless steel tube blank surfacing welds is required to meet the corresponding requirements of QJ2865A "Conduit Welding Technical Conditions";

[0048] 3) Machining the stainless steel tube surfacing blank to obtain a finished tube with a slightly smaller diameter, wall thickness and length, such as figure 2 ;

[0049] 4) According to the pipe diameter and wall thickness obtained in the previous step, process the 5A06 aluminum alloy pipe blank of the size shown in the figure below, such as image 3 ;

[0050] 5) Laser welding the prefabricated end of the finished stainless steel pipeline obtained in the third step and the a...

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Abstract

The invention relates to a stainless steel / aluminum alloy dissimilar metal pipeline welding method, and belongs to the technical field of metal materials and processes. A silver-copper alloy wire argon arc surfacing method is adopted, and a silver-copper alloy transition layer with a certain thickness is preset at the end of a stainless steel pipe blank with a certain size; the stainless steel pipe blank with the preset transition layer is machined to a certain size through a machining method; and the aluminum alloy pipe blank of the corresponding size and the machined stainless steel pipe transition layer are welded together through a high-energy beam welding method. The transition layer with a certain thickness is adopted, and the transition layer has good solid phase compatibility with aluminum and steel, so that the possibility that the steel and the aluminum form a brittle phase is thoroughly blocked.

Description

technical field [0001] The invention relates to a welding method for stainless steel / aluminum alloy dissimilar metal pipelines, belonging to the technical field of metal materials and processes. Background technique [0002] The welding methods commonly used in the welding of aluminum and steel dissimilar metals are: fusion welding, cold pressing welding, friction welding, diffusion welding, explosion welding, etc. Ni-Zn to reduce the thickness of the brittle intermetallic compound layer and improve the joint strength. In order to completely eliminate the oxide film on the surface of steel and aluminum during cold-press welding, the deformation of the joint needs to reach more than 70%-80%. In friction welding, shorten the heating time and apply a large upsetting force to extrude the intermetallic compounds that may be formed. Ni and Cu intermediate layers are added during diffusion welding, and the surface roughness to be welded is 3.2μm-6.3μm. Despite this, it is still ...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K101/06B23K103/20
CPCB23K28/02B23K2101/06B23K2103/20Y02P10/20
Inventor 周炼刚孙建秋温思涵程昊焦好军
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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