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Galvanized steel sheet laser tailor welding method

A technology of galvanized steel sheet and laser tailor welding, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as welding defects, improve grain structure, reduce welding thermal stress, structure shape good looking effect

Inactive Publication Date: 2018-03-23
CHONGQING UNIV OF ARTS & SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In view of this, the present invention proposes a method for laser tailor welding of galvanized steel sheets in order to prevent zinc vapor from draining away the surrounding molten metal or form bubbles at the weld seam, and solve the problem of welding defects caused by zinc vapor. Laser welding method for rapid tailor welding of galvanized steel sheets without welding defects

Method used

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  • Galvanized steel sheet laser tailor welding method
  • Galvanized steel sheet laser tailor welding method
  • Galvanized steel sheet laser tailor welding method

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Embodiment 1

[0025] A. Two galvanized steel sheets with a thickness of 1.2mm to be welded are to be wiped with anhydrous alcohol and acetone to remove oil stains and dirt on the surface of the galvanized steel sheets;

[0026] B. Splice the galvanized steel sheets and fix them with tooling tools;

[0027] C. Use laser beam to pre-weld galvanized steel plate. The laser beam power is 300W, the defocus is 0, the welding speed is 2.4m / min, and nitrogen is used as the side blowing gas for pre-welding;

[0028] D. Use laser beam to laser weld galvanized steel plate. The laser beam power is 1000W, the defocus is -0.5mm, the welding speed is 1.8m / min, and nitrogen is used as the shielding gas during the welding process;

[0029] E. After welding, put the galvanized steel sheet after tailor welding in a heat treatment furnace at 150°C for heat treatment, and cool it in the air to room temperature after holding time for 3 hours.

[0030] The operation steps of embodiment 2~5 are identical with embo...

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Abstract

The invention belongs to the field of laser welding, and particularly relates to a galvanized steel sheet laser tailor welding method. The method includes the following steps that A, two galvanized steel sheets for tailor welding are prepared, and oil stains and dirt on the surface of each galvanized steel sheet are removed; B, the galvanized steel sheets are spliced; C, laser beams are adopted for pre-welding of the galvanized steel sheets; D, the laser beams are adopted for conducting laser welding on the galvanized steel sheets; and E, heat treatment is conducted quickly after welding is completed, and the galvanized steel sheets are cooled to the indoor temperature in the air. By adoption of the laser welding method, the phenomenon that zinc vapor exhausts away molten metal around or air bubbles are formed at the welded joint position can be effectively prevented, and the problem of welding flaws caused by the zinc vapor is solved.

Description

technical field [0001] The invention belongs to the field of laser welding, in particular to a method for laser tailor welding of galvanized steel sheets. Background technique [0002] In industrial fields such as the automobile industry, galvanized steel sheets have been widely used due to their high strength, low cost, and good corrosion resistance. Compared with the conventional welding process, the laser welding process has the characteristics of high precision, high quality and fast welding speed. Therefore, in the field of the automobile industry, attempts have been made to weld galvanized steel sheets using a laser welding process. [0003] For a good joint, the iron layers of the galvanized steel sheet need to penetrate each other. The melting point and boiling point of zinc are 420°C and 907°C, respectively, which are far lower than the melting point of iron at 1535°C. Therefore, when galvanized sheets are welded and received laser irradiation in a spliced ​​mode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/26B23K26/60B23K26/142B23K26/12B23K103/04B23K101/18
CPCB23K26/26B23K26/123B23K26/142B23K26/60B23K2101/185B23K2103/04
Inventor 滕柳梅郭朝中叶小舟林震彭飞
Owner CHONGQING UNIV OF ARTS & SCI
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