Welding process for improving tensile-shear force and plasticity of 2GPa steel welding joint

A welding process and welding head technology, applied in the field of advanced ultra-high-strength steel welding for vehicles, can solve the problems of affecting tensile shear force and plasticity, poor mechanical properties of welded joints, etc., to change the fracture path, avoid welding cracks, and uneven temperature. Sex-reducing effect

Pending Publication Date: 2021-11-09
BEIHANG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention provides a welding process for improving the tensile shear force and plasticity of 2GPa steel welded joints, using small pulse current for preheating, large pulse current for welding, small pulse current for long time tempering, and avoiding large pulse current in the back Large secondary nucleation formed during the fire process affects tensile shear and plasticity, solves the problem of poor mechanical properties of welded joints caused by 2GPa steel due to high carbon equivalent, and provides technical support for the wide application of 2GPa steel in car bodies

Method used

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  • Welding process for improving tensile-shear force and plasticity of 2GPa steel welding joint
  • Welding process for improving tensile-shear force and plasticity of 2GPa steel welding joint

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Embodiment 1

[0031] The embodiment of the present invention takes preheating, welding and tempering three pulse current welding 2GPa steel as an example. The thickness of the 2GPa steel is 1.4mm and the tensile strength is 2000MPa. The method flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0032] S1, use an angle grinder to remove the oxide layer, rust and other surface impurities in the area to be welded of 2GPa steel, and wipe the polished area with a non-woven cloth adhered to acetone to remove the oil on the surface of the area to be welded, and then put the two pieces of surface treated The 2GPa steel plate is lapped and placed between the two electrode heads of the resistance spot welding machine. The diameter of the electrode head is 6mm. Start the resistance spot welding machine and apply an electrode pressure of 4KN;

[0033] S2, critical welding pulse current I for 2GPa steel by resistance spot welding machine 0 explore test, get I 0 8KA;

[00...

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Abstract

The invention discloses a welding process for improving tensile-shear force and plasticity of a 2GPa steel welding joint. the welding process comprises the following specific steps of: polishing and cleaning a to-be-welded area of 2GPa steel, then placing the to-be-welded area between electrode tips of a resistance spot welding machine, and applying electrode pressure; performing critical welding pulse current I0 exploration test on the 2GPa steel by adopting the resistance spot welding machine; replacing the to-be-welded 2 GPa steel, applying the electrode pressure, preheating the to-be-welded area of a 2GPa steel plate by adopting preheating pulse current, and then cooling; welding the 2GPa steel plate by adopting welding pulse current, and then cooling; and tempering the area where welding spots are formed by adopting tempering pulse current. According to the welding process, the problem that the mechanical property of the welding joint is poor due to the fact that the 2GPa steel is high in carbon equivalent is solved, and technical support is provided for wide application of the 2GPa steel to a vehicle body.

Description

technical field [0001] The invention relates to the technical field of advanced ultra-high-strength steel welding for vehicles, and more specifically relates to a welding process for improving the tensile shear force and plasticity of a 2GPa steel welding joint. Background technique [0002] Automobile lightweight is the main way to reduce automobile energy consumption. It is the development trend of modern automobiles to ensure the safety performance of automobiles while reducing the weight of automobiles. Advanced ultra-high-strength steel for automobiles has been widely used in automobile body manufacturing due to its ultra-high strength and excellent energy absorption properties. With the continuous improvement of steel smelting technology, the tensile strength of high-strength steel for vehicles has increased from 590MPa to 2000MPa. [0003] Resistance spot welding is widely used in the body manufacturing process due to its advantages of simple operation, high producti...

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 郭伟薛俊良夏明生赵光孟根巴根张宏强朱颖
Owner BEIHANG UNIV
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