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A cmt welding process of 1cr18ni9ti stainless steel and 5a06 aluminum alloy

A welding process, stainless steel technology, applied in welding equipment, metal processing equipment, welding/welding/cutting articles, etc., can solve problems such as low weld strength, reduced weld strength of aluminum-steel connection, and reduced weld plasticity. Achieve the effects of improving reliability and stability, reducing welding heat input, and improving molding quality

Active Publication Date: 2020-12-22
XIAN SPACE ENGINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is likely to cause excessive welding heat input
When the heat input increases, hot cracks are likely to occur on the surface of the weld, and at the same time, liquid aluminum penetration cracks will be formed on the steel side of the aluminum-steel junction inside the weld, resulting in a significant decrease in the strength of the aluminum-steel connection weld
At the same time, there are many weld joints during manual welding, and the joints are heated for many times due to arc start and end arc, which makes the grain grow seriously, so the plasticity of the weld here is significantly reduced
[0004] In summary, the welding of 1Cr18Ni9Ti stainless steel pipe and 5A06 aluminum alloy pipe by manual argon arc welding has low weld strength and large fluctuations in welding quality

Method used

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  • A cmt welding process of 1cr18ni9ti stainless steel and 5a06 aluminum alloy
  • A cmt welding process of 1cr18ni9ti stainless steel and 5a06 aluminum alloy
  • A cmt welding process of 1cr18ni9ti stainless steel and 5a06 aluminum alloy

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Experimental program
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Effect test

example 1

[0041] like figure 1 In the form of a lap joint structure shown, the wall thickness of the 1Cr18Ni9Ti stainless steel tube is 2 mm, and the wall thickness of the 5A06 aluminum alloy tube is 2 mm. The welding posture of this joint structure is as follows: figure 2 shown.

[0042] (1) The parts to be welded of steel pipes are processed with 11mm long external threads, and the parts to be welded of aluminum pipes are processed with 11mm long internal threads. Aluminum parts need to process welding groove: the groove angle is 30°, and the blunt edge is not more than 1mm;

[0043] (2) Polish the surface of the stainless steel to be welded, with a surface finish of 3.2 μm; pre-set an intermediate layer on the surface to be welded on the steel side: the thickness of the nickel layer is 3 μm; pre-treat the aluminum surface to remove the surface oxide layer;

[0044] (3) Assemble 1Cr18Ni9Ti stainless steel pipe and 5A06 aluminum alloy pipe to ensure that the gap between the two par...

example 2

[0048] like image 3 Shown is a lap joint structure, 1Cr18Ni9Ti stainless steel tube wall thickness is 3mm, 5A06 aluminum alloy tube wall thickness is 3.5mm. The welding posture of this joint structure is as follows: figure 2 shown.

[0049] (1) The steel pipe to be welded is processed with a 15mm long external thread, and the aluminum pipe to be welded is processed with a 15mm long internal thread. Aluminum parts need to process welding groove: the groove angle is 45°, and the blunt edge is not more than 1mm;

[0050] (2) Polish the surface of the stainless steel to be welded, with a surface finish of 3.2 μm; pre-set an intermediate layer on the surface to be welded on the steel side: the thickness of the nickel layer is 4 μm; pre-treat the aluminum surface to remove the surface oxide layer;

[0051] (3) Assemble 1Cr18Ni9Ti stainless steel pipe and 5A06 aluminum alloy pipe to ensure that the gap between the two parts is not greater than 0.15mm, and the effective length of...

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Abstract

The invention provides a CMT welding process for 1Cr18Ni9Ti stainless steel and 5A06 aluminum alloy. The CMT welding process for the 1Cr18Ni9Ti stainless steel and the 5A06 aluminum alloy comprises the steps that after a middle layer is prearranged on the to-be-welded surface of a steel side, a 1Cr18Ni9Ti stainless steel pipe and a 5A06 aluminum alloy pipe are assembled into a structural componentwith an overlap joint; the 1Cr18Ni9Ti stainless steel pipe and the 5A06 aluminum alloy pipe are welded at a proper welding posture through the CMT welding process, and finally, a melt-brazed joint isobtained. By adoption of the CMT welding process for the 1Cr18Ni9Ti stainless steel and the 5A06 aluminum alloy, the technical problem that the argon arc welding strength of the 1Cr18Ni9Ti stainlesssteel and the 5A06 aluminum alloy is low is solved, the generation probability of welding defects such as permeation cracks caused by molten aluminum in weld joints to the steel sides is lowered, andthe connection strength is greatly improved.

Description

technical field [0001] The invention relates to a CMT welding process, which is suitable for welding 1Cr18Ni9Ti stainless steel with a wall thickness of 1.5-5 mm and a 5A06 aluminum alloy lap joint structure with a wall thickness of 1.5-5 mm. Background technique [0002] At this stage, the welding of 1Cr18Ni9Ti stainless steel pipe and 5A06 aluminum alloy pipe adopts manual argon arc welding. Lap joints for aluminum alloy pipes. [0003] 5A06 aluminum alloy dissipates heat quickly. In order to ensure good fusion of the aluminum side and form an effective molten pool at the welding joint, low welding speed and high current are generally used for manual argon arc welding of 5A06 aluminum alloy and 1Cr18Ni9Ti stainless steel. However, this method is likely to cause excessive welding heat input. When the heat input increases, thermal cracks are likely to occur on the surface of the weld, and at the same time, liquid aluminum penetration cracks will be formed on the steel side...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/022B23K9/028B23K101/06B23K103/20
CPCB23K9/022B23K9/0282
Inventor 王继长蔡强顺向彦君顾京松
Owner XIAN SPACE ENGINE CO LTD
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