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Splashing-free resistance spot-welding method of galvanized steel plates for car

A technology of galvanized steel sheet and resistance spot welding, which is applied in the direction of resistance welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as not mentioning the influence of spatter spot welding quality, reducing the strength of spot welding joints, etc., and achieving improved welding Safety, reduce welding energy consumption, improve the effect of solder joint strength

Inactive Publication Date: 2019-08-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese Patent No. CN102672332 "A Method for Prolonging the Service Life of Electrodes for Resistance Spot Welding of Galvanized Steel Sheets" discloses a method of inserting copper-nickel alloy gaskets between electrodes and galvanized steel sheets to improve galvanized steel sheets. The method of electrode service life, without mentioning the insertion of spacers between galvanized steel sheets to prevent the generation of spatter and the impact on the quality of spot welding
[0006] The Chinese patent No. CN102275046 "A Method for Resistance Brazing of Galvanized Steel Sheets" discloses a spot welding method in which medium-temperature solder such as Zn-Al is placed between the surfaces to be welded, which can effectively avoid the generation of spatter in spot welding , but the addition of medium-temperature solder softens the heat-affected zone of the joint, and at the same time Al and Fe produce brittle Fe-Al intermetallic compounds, which will reduce the strength of the spot welded joint

Method used

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  • Splashing-free resistance spot-welding method of galvanized steel plates for car
  • Splashing-free resistance spot-welding method of galvanized steel plates for car

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] DP780 dual-phase steel hot-dip galvanized sheet, plate thickness 1.8mm, galvanized layer thickness 5μm; adding Cu intermediate layer thickness 0.02mm. The electrode is Cu-Al 2 o 3 , the end face of the electrode is concave, the diameter of the end face is 8mm, and the radius R of the concave surface is 30mm.

[0034] The Cu intermediate layer is placed between two galvanized steel sheets, and the composition is by mass percentage: 1.6% Mn, 10% Fe, O<0.02%, and the rest is Cu.

[0035] Set the preloading time to 2000ms, the welding current to 9.5kA, the welding time to 300ms, and the welding pressure to 3.0kN. Perform resistance spot welding and cool naturally after welding.

Embodiment 2

[0037] DP780 dual-phase steel electro-galvanized sheet, plate thickness 0.7mm, galvanized layer thickness 22μm; adding Cu intermediate layer thickness 0.2mm. The electrode is Cu-Cr-Zr, the electrode end surface is concave, the end surface diameter is 6mm, and the radius R of the concave surface is 55mm.

[0038] The Cu intermediate layer is placed between two galvanized steel sheets, and the composition is by mass percentage: 3% Mn, 1% Fe, O<0.02%, and the rest is Cu.

[0039] Set the preloading time to 1000ms, the welding current to 6.5kA, the welding time to 260ms, and the welding pressure to 1.5kN. Perform resistance spot welding and cool naturally after welding.

Embodiment 3

[0041] DP780 dual-phase steel hot-dip galvanized sheet, plate thickness 3mm, galvanized layer thickness 15μm; add Cu intermediate layer thickness 0.05mm. The electrode is Cu-Al 2 o 3 , The end face of the electrode is concave, the diameter of the end face is 8mm, and the radius R of the concave surface is 45mm.

[0042] The Cu intermediate layer is placed between two galvanized steel sheets, the composition: 2% Mn, 5% Fe, O<0.02%, and the rest is Cu.

[0043] Set the preloading time to 1600ms, the welding current to 11kA, the welding time to 400ms, and the welding pressure to 4.0kN for resistance spot welding, followed by natural cooling after welding.

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Abstract

The invention discloses a splashing-free resistance spot-welding method of galvanized steel plates for a car. The method is characterized by comprising the following steps that 1, a Cu middle layer isarranged between to-be-welded portions of the two galvanized steel plates to be welded, and the thickness of the Cu middle layer is 0.02-0.20 mm; 2, spot welding pre-pressing is carried out on the two galvanized steel plates to be welded, and pre-pressing time is 1000-2000 ms; and 3, spot welding is carried out on the to-be-welded portions of the two galvanized steel plates to be welded. According to the method, generation of splashing in the welding process can be prevented, strength of welding spots is improved, and the problem of spot welding of the galvanized steel plates is solved.

Description

technical field [0001] The invention relates to the technical field of vehicle air-conditioning control, in particular to a method for resistance spot welding of galvanized steel sheets for vehicles without splashing. Background technique [0002] In recent years, the automobile industry in various countries has paid more and more attention to the anti-corrosion performance of materials, and ordinary cold-rolled steel sheets can no longer meet the requirements of its anti-corrosion performance. In the 1980s, galvanized sheets began to be mass-produced to replace cold-rolled steel sheets. With the rapid development of my country's automobile industry, the total output in 2008 was 9.38 million taels, and it reached 20 million in 2013. Among them, the proportion of cars in the total output continues to increase, making the application of galvanized steel sheets in automobiles more and more important. . [0003] In automobile manufacturing, resistance spot welding is the most i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/34
CPCB23K11/11B23K11/34
Inventor 陈浮黄治军钟如涛
Owner 武汉钢铁有限公司
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