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Resistance unit welding method of Ni element regulated and controlled magnetic field assisted aluminum alloy and steel

A technology of magnetic field assistance and welding method, which is applied in the direction of resistance welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of poor bearing capacity of ferrite, increase of use cost, decline of weld structure and performance, etc., and achieve suppression of formation and Effects of segregation, increased uniformity, and enhanced overall performance

Inactive Publication Date: 2020-12-25
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bearing capacity of ferrite is poor. Compared with the full martensitic structure, the microstructure and performance of welds with a large amount of ferrite and segregation are significantly reduced.
[0004] Due to the adverse effect of the Al-Si coating on the surface of the hot stamping formed steel on welding, it is necessary to use certain means to remove the coating when welding this steel type, which increases the cost of use to a certain extent

Method used

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  • Resistance unit welding method of Ni element regulated and controlled magnetic field assisted aluminum alloy and steel
  • Resistance unit welding method of Ni element regulated and controlled magnetic field assisted aluminum alloy and steel
  • Resistance unit welding method of Ni element regulated and controlled magnetic field assisted aluminum alloy and steel

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Effect test

specific Embodiment approach 1

[0040] A kind of magnetic field assisted aluminum alloy and steel resistance unit welding method regulated by Ni element comprises the following steps:

[0041] Step 1. Prepare the steel base material, aluminum alloy base material, rivets, and Ni foil to be welded, and make holes on the surface of the aluminum alloy base material to be welded for use;

[0042] Step 2. After degreasing and cleaning the steel base material to be welded, the aluminum alloy base material after the through hole, the rivet, and the Ni foil, air-dry and set aside;

[0043] Step 3. Fix the magnet on the electrode head of the resistance spot welding machine for use;

[0044] Step 4. Put the Ni foil between the aluminum alloy base material and the steel base material. After lapping, place the rivet in the through hole of the aluminum alloy. After pressing the rivet, Ni foil and steel base material, use step 3 to have The electrode head of the magnet is welded to the resistance unit.

[0045] In the me...

specific Embodiment approach 2

[0061] A kind of magnetic field assisted aluminum alloy and steel resistance unit welding method regulated by Ni element comprises the following steps:

[0062] Step 1. Prepare the steel base material, aluminum alloy base material, rivets, and Ni foil to be welded, and make holes on the surface of the aluminum alloy base material to be welded for use;

[0063] Step 2. After degreasing and cleaning the steel base material to be welded, the aluminum alloy base material after the through hole, the rivet, and the Ni foil, air-dry and set aside;

[0064] Step 3. Fix the magnet on the electrode head of the resistance spot welding machine for use;

[0065] Step 4. Put the Ni foil between the aluminum alloy base material and the steel base material. After lapping, place the rivet in the through hole of the aluminum alloy. After pressing the rivet, Ni foil and steel base material, use step 3 to have The electrode head of the magnet is welded to the resistance unit.

[0066] In the me...

specific Embodiment approach 3

[0077] A kind of magnetic field assisted aluminum alloy and steel resistance unit welding method regulated by Ni element comprises the following steps:

[0078] Step 1. Prepare the steel base material, aluminum alloy base material, rivets, and Ni foil to be welded, and make holes on the surface of the aluminum alloy base material to be welded for use;

[0079] Step 2. After degreasing and cleaning the steel base material to be welded, the aluminum alloy base material after the through hole, the rivet, and the Ni foil, air-dry and set aside;

[0080] Step 3. Fix the magnet on the electrode head of the resistance spot welding machine for use;

[0081]Step 4. Put the Ni foil between the aluminum alloy base material and the steel base material. After lapping, place the rivet in the through hole of the aluminum alloy. After pressing the rivet, Ni foil and steel base material, use step 3 to have The electrode head of the magnet is welded to the resistance unit.

[0082] In the met...

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Abstract

The invention discloses a resistance unit welding method of an Ni element regulated and controlled magnetic field assisted aluminum alloy and steel, and belongs to the technical field of welding. Theinventions aims to solve the technical problem that the welding performance is improved on the premise of keeping an AlSi coating on the surface of the steel. According to the method, a small hole isprefabricated in the surface of the aluminum alloy, a rivet is placed in the small hole, and nuggets are formed on the interfaces of the rivet and the steel during welding, so that the connection between the aluminum alloy and the steel is realized. An Ni foil is placed at the interface of the rivet and the hot stamping forming steel, an alloy element Ni is introduced into a molten pool through melting of the foil to improve the austenite stability, and generation of a full martensite structure in the molten pool is promoted; and meanwhile, permanent magnets are adopted to generate a constantradial strong magnetic field at the welding position, flowing of the Ni element and an Al element in the molten pool is promoted through the electromagnetic stirring effect, the structure uniformity is improved, large-scale generation and segregation of ferrite in the molten pool are restrained, the solidification behavior of liquid metal is improved, the size of the molten pool is increased, grains are refined, and air hole defects are eliminated.

Description

technical field [0001] The invention belongs to the field of welding technology; in particular, it relates to a method for welding resistance units of aluminum alloy and steel controlled by a Ni element and assisted by a magnetic field. Background technique [0002] In recent years, with the enhancement of people's awareness of environmental protection, energy conservation and emission reduction has gradually become the mainstream awareness of human survival. As the main means of transportation for human travel, vehicles have great room for improvement in the field of energy saving and emission reduction. More and more lightweight and high-strength materials are being applied in body manufacturing. Among them, aluminum alloy has the advantages of low density and high strength, and is widely used in non-main load-bearing structures such as body panels and rear covers. [0003] With the continuous maturity of the third-generation advanced high-strength steel technology, hot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/36
CPCB23K11/11B23K11/36
Inventor 黄蓉蓉檀财旺陈波吴来军宋晓国冯吉才
Owner HARBIN INST OF TECH AT WEIHAI
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