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Galvanized high-strength steel resistance spot welding method with good joint performance

A resistance spot welding and high-strength steel technology, applied in resistance welding equipment, welding power sources, welding power sources, etc., can solve the problems of no application, joint interface fracture, LME cracks, etc., to suppress the crack problem, improve the plasticity and quality of solder joints reliable results

Active Publication Date: 2018-05-11
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The joint is prone to interface fracture
[0006] Regarding the issue of LME cracks, no relevant patents have been applied in China after searching

Method used

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  • Galvanized high-strength steel resistance spot welding method with good joint performance
  • Galvanized high-strength steel resistance spot welding method with good joint performance
  • Galvanized high-strength steel resistance spot welding method with good joint performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] A 1.6mm galvanized high-strength steel (see Table 2 for mechanical properties and composition) was spot-welded by three spot welding processes of No. 1, No. 2 and No. 3. Compare and evaluate the LME crack generation of the solder joints and the fracture mode of the solder joints during the ring breakage test. The characteristics and test results of the three spot welding processes are shown in Table 3.

[0067] Table 2 Composition and mechanical properties of a galvanized high-strength steel

[0068]

[0069]

[0070] Table 3 Characteristics and results of No. 1, No. 2 and No. 3 spot welding processes

[0071]

[0072] The detailed results are as follows:

[0073] 1. Results of No. 1 spot welding process:

[0074] The details of No. 1 spot welding process are shown in Table 4:

[0075] Table 4 No. 1 spot welding process

[0076]

[0077] Note: I in the table 1 =I 2 =I 3

[0078] Through metallographic testing, severe liquid metal embrittlement (LME)...

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Abstract

The invention relates to a resistance spot welding method of a galvanized steel plate with tensile strength larger than or equal to 590 Mpa. According to the galvanized high-strength steel resistancespot welding method with the good joint performance, three welding pulses are used in a spot welding period; the first welding pulse and the second welding pulse are used for generating a nugget and restraining the generation of the liquid metal embrittlement (LME) crack, wherein the first welding pulse generates the nugget with the diameter of 3.75 T<1 / 2>-4.25 T<1 / 2>, and the T in the formula isthe plate thickness; the second welding pulse makes the nugget grow slowly; the third welding pulse is a slow-cooling pulse and is used for improving the plasticity of the welding spot. According to the first welding pulse, by setting the time t1 of the first welding pulse and carrying out a test, the welding current I1 of the first welding pulse is obtained, wherein the welding current I1 of thefirst welding pulse is the welding current corresponding to when the nugget with the diameter of 3.75 T<1 / 2>-4.25 T<1 / 2> is generated; and the welding current I2 and the time t2 of the second weldingpulse and the welding current I3 and the time t3 of the third welding pulse are obtained by calculating the welding current I1 and the time t1 of the first welding pulse.

Description

technical field [0001] The invention relates to a welding method for steel sheets for automobiles, in particular to a resistance spot welding method for galvanized steel sheets with tensile strength ≥ 590Mpa. Background technique [0002] In recent years, with the soaring oil price and people's increasing awareness of energy saving, environmental protection and vehicle safety, various body lightweight technologies have been widely used in the automobile manufacturing industry. In this context, the proportion of high-strength steel used in automobile bodies is increasing. Resistance spot welding has been widely used in the automotive industry due to its advantages of high production efficiency and easy automation, and will continue to be the main welding method for high-strength steel plates in the automotive industry. Therefore, the resistance spot welding technology of high-strength steel has been widely concerned . [0003] The joints of high-strength steel galvanized sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11
CPCB23K11/11B23K11/115B23K11/241
Inventor 雷鸣潘华左敦桂苏永超蒋浩民石磊
Owner BAOSHAN IRON & STEEL CO LTD
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