Spot-welded joint of high-strength steel plate and manufacturing method thereof

A technology for welding joints and steel plates, applied in manufacturing tools, welding equipment, resistance welding equipment, etc., can solve problems such as easy defects, low joint performance, interface failure, etc., to achieve low cost, improved tensile and shear performance, and simple methods. Effect

Active Publication Date: 2021-01-15
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0011] The main problem to be solved by the present invention is that high-strength steel plates with a manganese content of 0.5%-15% tend to have internal defects, inclusions, and cracks during resistance spot welding, and when the welding fails, the interface fails and the joint performance is very low. question

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  • Spot-welded joint of high-strength steel plate and manufacturing method thereof
  • Spot-welded joint of high-strength steel plate and manufacturing method thereof
  • Spot-welded joint of high-strength steel plate and manufacturing method thereof

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Embodiment Construction

[0035] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, the drawings are schematic diagrams, so the device and equipment of the present invention are not limited by the size or scale of the schematic diagrams.

[0036] It should be noted that in the claims and description of this patent, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or Any such actual relationship or order between such entities or operations is implied. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, but...

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Abstract

The present invention improves the welding quality of a spot-welded joint, specifically the mechanical property of the joint by obtaining a spot-welded joint formed by overlapping and spot-welding a plurality of steel plates, wherein at least one of the steel plates is a high-strength steel plate having a manganese content of 0.5%-15% by mass. A welding base material, a melting zone and a heat affected zone are arranged in the section, cut in the thickness direction of the steel plate, of the center of a welding spot, the microhardness of the base material is HV1, the microhardness of the melting zone is HV2, and HV2/HV1 is greater than or equal to 0.8 and less than or equal to 1.2. According to the method, heat insulation treatment at a certain temperature and for a certain time is conducted after completion of spot welding, wherein the joint is obtained by rediffusing carbon atoms in martensite in a partial region including at least the melting zone and the heat affected zone at a distance of 2 nm or more.

Description

technical field [0001] The invention relates to a spot welding joint of a high-strength steel plate in the field of automobiles and a manufacturing method. Background technique [0002] In recent years, with the global requirements for reducing greenhouse gas emissions and fuel consumption, automobile lightweight has become an important development direction in the automotive field. In order to reduce the weight of automobiles without losing the safety of automobiles, more and more high-strength steel plates are used in automobile manufacturing. Especially with the continuous development of steel technology, the third generation of high-strength steel that takes into account production cost and excellent material properties has emerged, including medium manganese steel with relatively high manganese content. Resistance spot welding is the most widely used manufacturing technology in automobile manufacturing, but the welding failure of medium manganese steel often occurs as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K33/00B23K11/11
CPCB23K33/00B23K11/115
Inventor 杨上陆王艳俊罗海文李硕硕
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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