Resistance spot welding process capable of effectively improving strength of welding spot of advanced high-strength steel plate

A high-strength steel and process technology, applied in resistance welding equipment, manufacturing tools, welding equipment, etc., can solve the problems of low solder joint performance, cross tensile properties do not increase but decrease, and advanced high-strength steel is prone to splashing, etc., and achieve remarkable results. , the effect of a large current adjustment range

Inactive Publication Date: 2017-08-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is that the advanced high-strength steel is easy to spatter and the performance of the solder joint is low, especially the problem that the cross tensile performance does not increase but decreases, and a resistance spot welding that can effectively improve the strength of the solder joint of the advanced high-strength steel plate is provided craft

Method used

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  • Resistance spot welding process capable of effectively improving strength of welding spot of advanced high-strength steel plate
  • Resistance spot welding process capable of effectively improving strength of welding spot of advanced high-strength steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Conditions for testing advanced high-strength steel: the thickness of the steel plate is 1.2mm, and the tensile strength of the steel plate is 1000MPa.

[0014] 1) The single pulse welding test shows that the critical spatter current I0 is 8kA;

[0015] 2) Execute step 1, use the soft specification welding current I1, the calculation formula of I1 is I1=I0-(0.5~1) (unit: kA), here select I1 as 7kA, and the welding time is 800ms;

[0016] 3) Intermittent 10ms;

[0017] 4) Execute step 2, use the hard standard welding current I2, the calculation formula of I2 is: I0

Embodiment 2

[0019] Conditions for testing advanced high-strength steel: the thickness of the steel plate is 1.2mm, and the tensile strength of the steel plate is 1400MPa.

[0020] 1) The single pulse welding test shows that the critical spatter current I0 is 8kA;

[0021] 2) Execute step 1, use the soft specification welding current I1, the calculation formula of I1 is I1=I0-(0.5~1) (unit: kA), here select I1 as 7.5kA, and the welding time is 1000ms;

[0022] 3) Intermittent 10ms;

[0023] 4) Execute step 2, use the hard standard welding current I2, the calculation formula of I2 is: I0

Embodiment 3

[0025] Conditions for testing advanced high-strength steel: the thickness of the steel plate is 1.5mm, and the tensile strength of the steel plate is 1500MPa.

[0026] 1) The single pulse welding test shows that the critical spatter current I0 is 9kA;

[0027] 2) Execute step 1, use the soft specification welding current I1, the calculation formula of I1 is I1=I0-(0.5~1) (unit: kA), here select I1 as 8kA, and the welding time is 1000ms;

[0028] 3) Intermittent 10ms;

[0029] 4) Execute step 2, use the hard specification welding current I2, the calculation formula of I2 is: I0

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Abstract

The invention relates to a resistance spot welding process capable of effectively improving the strength of a welding spot of an advanced high-strength steel plate. The resistance spot welding process aims to increase the nugget diameter of the welding spot and the softening heat affected zone range at the same time so as to improve the mechanical property of an advanced high-strength steel spot welding connector. A dual pulse mode is adopted in the process. The process specifically comprises the steps that firstly, a soft parameter pulse I1 is adopted, and non-splash welding of the first time is carried out on the advanced high-strength steel plate; and secondly, a hard parameter pulse I2 is adopted, the welding spot achieving connection in the first step is heated and molten again, the nugget diameter of the welding spot is further increased, and meanwhile the softening range of a heat affected zone can be further increased. By means of the large enough welding spot diameter and softening zone, structural stress concentration caused in the service loaded process of the advanced high-strength steel spot welding spot can be effectively reduced, the welding spot performance of the advanced high-strength steel plate is greatly improved, and the welding process can completely eliminate the splash problem of advanced high-strength steel resistance spot welding.

Description

technical field [0001] The invention relates to a resistance spot welding process, in particular to a resistance spot welding process which can effectively improve the welding spot strength of an advanced high-strength steel plate. Background technique [0002] With the improvement of science and technology and people's living standards, as well as the increasingly prominent problems of global energy crisis and environmental pollution, safe, energy-saving and environmentally friendly vehicles have increasingly become the focus of attention of vehicle manufacturers and users. According to statistics, when the thickness of the steel plate is reduced by 0.10mm, the weight of the vehicle body can be reduced by 12%. For every 1% reduction in vehicle weight, the fuel can be reduced by 0.6% to 1.0%. Therefore, in the case of ensuring the safety performance of the collision, the application of high-strength steel to the body can achieve the purpose of reducing the weight of the bod...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): B23K11/11
CPCB23K11/11B23K2101/18B23K2103/04
Inventor赖瑞林贺地求吴昌平林俊渊刘杭琪
OwnerCENT SOUTH UNIV