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A method for preventing the welding cracking of aluminum-steel dissimilar metal transition pipe joints

A technology for dissimilar metals and pipe joints, applied in the field of welding, can solve problems such as cracking of aluminum-steel welds, and achieve the effects of reducing welding shrinkage and deformation, simple equipment and simple process

Active Publication Date: 2022-01-14
SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a method for preventing cracking during assembly and welding of aluminum-steel dissimilar metal transition pipe joints. Stress and shrinkage stress lead to cracking of aluminum-steel welds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preventing cracking during assembly and welding of aluminum-steel dissimilar metal transition pipe joints, using the method to weld the joint structure of aluminum-steel dissimilar metal pipe joints in a restrained state: aluminum-steel dissimilar metal pipe joints have a diameter of 150 mm and a wall thickness of 5 mm, made of 5A06 Aluminum alloy and 304 stainless steel are welded by inertia friction welding. In the pipeline system, the aluminum alloy end is welded with the aluminum alloy head of the same material, and the stainless steel end is welded with the stainless steel head of the same material. The welding structure is For butt jointing, the two butt welds are 30mm away from the inertial friction weld of the aluminum-steel dissimilar metal pipe joint. Increase the pressure to 4MPa, keep the pressure for 10min without leakage, continue to pressurize until it bursts, and the burst pressure is not lower than 6MPa. The method steps are as follows:

...

Embodiment 2

[0046] A method for preventing cracking during assembly and welding of aluminum-steel dissimilar metal transition pipe joints, using the method to weld the sealing seam of the aluminum-steel dissimilar metal sealing cover in a restrained state: the aluminum-steel dissimilar metal sealing cover is a T-shaped structure, made of 2219 Aluminum alloy and 0Cr18Ni9 stainless steel are machined by inertia friction welding. The big end is 2219 aluminum alloy with a diameter of 166mm, the small end is 0Cr18Ni9 stainless steel with a diameter of 90mm, and the wall thickness is 2mm. It is used as a seal in the pipeline system. The aluminum alloy end is welded with the aluminum alloy flange of the same material, and the stainless steel end is welded with the stainless steel flange of the same material. The welding structure is a 2+2mm crimp end connection, and the distance between the two welding seams is the aluminum-steel dissimilar metal sealing cover itself. The shortest distance of the...

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PUM

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Abstract

The invention discloses a method for preventing the cracking of aluminum-steel dissimilar metal transition pipe joints. A cooling device is used to wrap the aluminum-steel dissimilar metal pipe joints and circulated for cooling. Pure He gas is used to protect DC TIG welding and 40% - respectively. 50% He-Ar mixed gas shielded AC TIG welding is used to weld the stainless steel end of the aluminum-steel dissimilar metal pipe joint in the piping system and the welding seam of the aluminum alloy end in small current segments, and the weld seam of the stainless steel end is welded first, and the aluminum alloy end is welded first. The alloy end is in a free state; at the same time, the temperature of the weld seam of the aluminum-steel dissimilar metal pipe joint is detected, and the welding can only be performed if it does not exceed the maximum temperature that the aluminum-steel weld seam of the pipe joint can withstand. The method of the invention can effectively prevent the cracking of the hard and brittle aluminum-steel dissimilar metal pipe joint itself caused by thermal stress and shrinkage stress in the welding process; Its own weld cracks.

Description

technical field [0001] The invention relates to an arc welding method, in particular to a welding method for preventing cracking of an aluminum-steel dissimilar metal transition pipe joint during assembly and welding, and belongs to the field of welding technology. Background technique [0002] The aluminum-steel dissimilar metal connection structure not only has the advantages of small specific gravity, good electrical conductivity, and good corrosion resistance of aluminum alloy, but also has the characteristics of high strength of steel. It has high practical value and is widely used; especially in In the pipeline connection systems of aerospace, air separation and other industries, aluminum-steel dissimilar metal pipe joints must be used due to product structure requirements. [0003] Aluminum-steel dissimilar metal pipe joints are generally welded by inertial friction welding, diffusion welding, and explosive welding, and then used as transition joints in the pipeline c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/32B23K9/325
Inventor 郑森木吴江巍裴利程王刚文远华张万春
Owner SICHUAN AEROSPACE LONG MARCH EQUIP MFG CO LTD