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Galvanized steel sheet lap-over laser welding method

A technology of laser welding and galvanized steel sheet, used in laser welding equipment, welding equipment, welding/welding/cutting items, etc., it can solve the problems of difficult to ensure the consistency of gaps, difficult to be uniform and uniform, and wave deformation of thin plates. The effect of low production cost, stable welding quality and simple equipment

Inactive Publication Date: 2009-08-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the thickness of the plate is 0.5-2mm, it is difficult to ensure the uniformity of the gap. During the welding process, the thin plate will produce wave deformation, and it is even more difficult to ensure the consistency of the gap.
Therefore, this method has not been applied in laser welding of high-strength galvanized thin steel sheets.

Method used

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  • Galvanized steel sheet lap-over laser welding method
  • Galvanized steel sheet lap-over laser welding method
  • Galvanized steel sheet lap-over laser welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Nd: YAG laser lap welding of DP600 double-sided hot-dip galvanized steel sheet

[0028] The thickness of the plate is 1mm, and the thickness of the double-sided galvanized layer is 0.01mm. The overlapping amount is 10mm, using Al-Sn foil with a width of 8mm, the power of the first laser beam is 2KW, the power of the second laser beam is 3KW, the focus diameter is 0.5mm, the welding speed is 4m / min, and there is no spatter on the surface after welding ( figure 2 ), the weld has no porosity and lack of meat ( image 3 ). The tensile and shear load per unit length of the welded joint reaches 650N / mm.

Embodiment 2

[0029] Example 2 CO of HSLA450 ​​double-sided hot-dip galvanized steel sheet 2 laser lap welding

[0030] The thickness of the plate is 1mm, and the thickness of the double-sided galvanized layer is 0.01mm. The overlapping amount is 8mm, using Al-Sn foil with a width of 8mm, the power of the first laser beam is 3KW, the power of the second laser beam is 4KW, the focus diameter is 0.5mm. The welding speed is 7m / min. There is no spatter on the surface after welding ( Figure 4 ), the weld has no porosity and lack of meat ( Figure 5 ). The tensile and shear load per unit length of the welded joint reaches 480N / mm.

[0031] The manufacturing method of the Al-Sn alloy foil used in examples 1 and 2 is as follows:

[0032] 1. Melt the aluminum ingot at 700-720°C in a resistance crucible furnace;

[0033] 2. Add the prepared tin ingot, and after it melts evenly, lower the temperature to 520-550°C to pour.

[0034] 3. Pouring with a metal mold to achieve rapid solidification.

...

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Abstract

The invention discloses a laser welding method for lapping galvanized steel sheets, which comprises: placing a Al-Sn alloy foil containing 35 to 45 weight percent of Sn between faying surfaces of the steel sheets; and utilizing two laser beams of which the power is respectively from 2 to 3KW and from 3 to 4KW to weld welding seams, wherein the space of the laser beams is between 20 and 50mm and the welding speed is between 4 and 8m / min. The method has low production cost and stable welding quality; and the strength of the obtained welding seams is greater than that of base metal, no welding spatter exists on the surface, and the corrosion resistance of the welding seams is more than three times higher than that of by a sweeping-out method. The method can be used for laser welding of lapped welding seams of DP series, TRIP series and HSLA series hot galvanized steel sheets, and realizes high efficiency, low pollution and low waste material of welding production.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to a laser lap welding process for high-strength galvanized thin plates. It is especially suitable for laser lap welding structures of high-strength galvanized thin plates, such as automobile body assembly welding, household appliance shell assembly welding, and other laser welding requiring corrosion-resistant galvanized structures. Background technique [0002] With the application of high-strength galvanized steel sheets in the automobile industry, the commonly used resistance welding technology will lead to early failure of electrodes and unstable spot welding quality. In this way, most automobile manufacturing industries in Europe and the United States have already used CO 2 Laser and Nd:YAG laser welding technologies have replaced resistance welding. However, due to the overlapping structure, it is easy to cause a large amount of zinc to evaporate from the joint surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K26/42C22C21/00B21C37/00C22C1/02C22F1/04B23K26/26B23K101/18B23K103/16B23K26/70
Inventor 周世权汪春华贝恩海周立
Owner HUAZHONG UNIV OF SCI & TECH
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