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Multi-size surface microstructure composite regulation aluminum stainless steel laser connection method

A connection method and stainless steel technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve problems such as brittle compounds and thermal stress cracking, and achieve the effects of optimizing stress distribution, improving joint strength, and increasing contact area.

Pending Publication Date: 2021-11-23
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of brittle compounds and thermal stress cracking produced in the welding process of aluminum / stainless steel in the prior art, the present invention provides a laser joining method of aluminum and stainless steel with multi-scale surface microstructure compound control

Method used

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  • Multi-size surface microstructure composite regulation aluminum stainless steel laser connection method
  • Multi-size surface microstructure composite regulation aluminum stainless steel laser connection method
  • Multi-size surface microstructure composite regulation aluminum stainless steel laser connection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The invention provides a method for laser joining of aluminum and stainless steel with multi-scale surface microstructure compound control, which is prepared according to the following steps:

[0054] Specifically include the following steps:

[0055] Clean the stainless steel and aluminum plates to be welded before welding.

[0056] The material to be welded is 2mm thick 304 stainless steel and 2mm thick 6063 aluminum alloy, and the stainless steel plate and aluminum plate to be welded are cleaned before welding. The aluminum plate is polished with sandpaper and then wiped with acetone.

[0057] Laser etching was carried out on the surface of the cleaned stainless steel plate to prepare the surface microstructure.

[0058] A short-pulse nanosecond laser was used to perform laser etching on the stainless steel obtained after cleaning. The laser power was 90W, the scanning speed was 600mm / s, and the scanning times were 10 times. The scanning strategy is set to be line...

Embodiment 2

[0068] This embodiment provides a method for laser joining of aluminum and stainless steel with composite control of multi-scale surface microstructures, which specifically includes the following steps:

[0069] Clean the stainless steel and aluminum plates to be welded before welding.

[0070] The material to be welded is 2mm thick 304 stainless steel and 2mm thick 6063 aluminum alloy, and the stainless steel plate and aluminum plate to be welded are cleaned before welding. The aluminum plate is washed with sodium hydroxide solution, pickled with hydrochloric acid, and wiped with acetone after drying.

[0071] Laser etching was carried out on the surface of the cleaned stainless steel plate to prepare the surface microstructure.

[0072] A short-pulse nanosecond laser was used to perform laser etching on the cleaned stainless steel, the laser power was 150W, the scanning speed was 500mm / s, and the number of scanning was 15 times. The scanning strategy is set to be linear, m...

Embodiment 3

[0083] This embodiment provides a method for laser joining of aluminum and stainless steel with composite control of multi-scale surface microstructures, which specifically includes the following steps:

[0084] Clean the stainless steel and aluminum plates to be welded before welding.

[0085] The material to be welded is 2mm thick 304 stainless steel and 2mm thick 6063 aluminum alloy, and the stainless steel plate and aluminum plate to be welded are cleaned before welding. The aluminum plate is washed with sodium hydroxide solution, pickled with hydrochloric acid, and wiped with acetone after drying.

[0086]Laser etching was carried out on the surface of the cleaned stainless steel plate to prepare the surface microstructure.

[0087] A short-pulse nanosecond laser was used to perform laser etching on the stainless steel obtained after cleaning. The laser power was 100W, the scanning speed was 1500mm / s, and the number of scanning was 30 times. The scanning strategy is set...

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Abstract

The invention relates to the technical field of welding, and discloses a multi-size surface microstructure composite regulation aluminum stainless steel laser connection method. The welding method comprises the following steps of (1) pretreating an aluminum / stainless steel surface, specifically, pretreatment comprises the following steps that a stainless steel plate to be welded and an aluminum plate to be welded are subjected to pre-welding cleaning; laser etching is conducted on the surface of the cleaned stainless steel plate, and the stainless steel plate with a surface microstructure is prepared; and chemical etching is performed on the stainless steel plate subjected to laser etching to prepare the stainless steel plate with the composite microstructure; and (2) placing and assembling the stainless steel with the composite microstructure and the cleaned aluminum plate in a lap joint manner, coating the surface of the stainless steel with brazing flux, adjusting a laser device to proper technological parameters, and carrying out welding. By means of the multi-size surface microstructure composite regulation aluminum stainless steel laser connection method, the problems of brittle compounds and thermal stress cracking generated in the aluminum / stainless steel welding process in the prior art are solved, and the strength of a connector is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a laser joining method for aluminum and stainless steel with multi-scale surface microstructure compound control. Background technique [0002] With the economic development and social progress, the problems of energy shortage and environmental pollution are becoming more and more serious. In terms of rail transportation, lightweight can reduce operating costs and energy consumption, and has become a key research direction in various countries. Aluminum alloy has low density, good corrosion resistance and low price. Stainless steel has high corrosion resistance, heat resistance and good processability. The application of the composite structure of the two in the field of rail transportation is highly anticipated, and the reliable connection of aluminum and stainless steel will have great significance for the lightweight design of rail transportation. [0003] At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/352B23K26/21B23K26/12B23K26/70C23F1/28
CPCB23K26/355B23K26/21B23K26/123B23K26/702C23F1/28
Inventor 李昊岳檀财旺李俐群陈波吴来军宋晓国
Owner HARBIN INST OF TECH AT WEIHAI
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