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Laser lap welding method for galvanized steel sheet

A technology of galvanized steel sheet and welding method, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as pinholes and bubble holes, achieve high speed and welding joints, excellent technical characteristics, avoid Effect of Welding Defects

Inactive Publication Date: 2011-07-13
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes various welding defect issues such as pitting, pinholes and air pockets

Method used

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  • Laser lap welding method for galvanized steel sheet
  • Laser lap welding method for galvanized steel sheet
  • Laser lap welding method for galvanized steel sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] After that, in order to verify the relationship between laser power and laser spot diameter, galvanized steel sheets with a thickness of t=0.7mm were used, wherein the galvanized steel sheets were stacked one on top of the other without gaps, so that each galvanized layer As the interface between them, experiments were performed to evaluate keyhole formation, occurrence of zinc gas defects, and welding quality. The experiment was carried out under each spot diameter below, while gradually changing the laser power P (kW) and the laser travel speed v (m / min): (a) spot diameter (b) Spot diameter (c) Spot diameter (d) Spot diameter and (e) point diameter

[0037] In the experiment, DISECK laser oscillator manufactured by TRUMPF company (maximum output 10kW and transmission fiber diameter And the maximum output 16kW and transmission fiber diameter ), where the wavelength of the laser beam is in the range of 1000 to 1200 nm, which is suitable for optical fiber tr...

Embodiment 2

[0044] After that, under the same conditions as the above example, galvanized steel sheets with a thickness of t = 1.2mm were used, wherein the galvanized steel sheets were stacked one on top of the other without gaps so that each galvanized layer was used as a gap between them. Experiments were conducted to evaluate keyhole formation, presence of zinc gas defects, and weld quality. The experiment was carried out under each spot diameter below, while gradually changing the laser power P (kW) and the laser travel speed v (m / min): (a) spot diameter and (b) point diameter

[0045] Figure 6 (a) to 6(b) show the experimental results. The symbols in each figure have the same meanings as those used in the above experiments. Although the number of samples is smaller than that at a thickness of 0.7 mm, approximately the same tendency is shown. Experiments are also sporadically at larger spot diameters than illustrated under, and at smaller spot diameters than shown next. f...

Embodiment 3

[0048] Afterwards, considering the above experimental results, galvanized steel sheets with a thickness of t = 0.6 mm were used, in which the galvanized steel sheets were stacked one on top of the other without gaps so that each galvanized layer served as a contact surface between them , so that experiments were performed to evaluate keyhole formation, occurrence of zinc gas defects, and welding quality. The experiment was carried out with a laser power P of 7kW at each of the following spot diameters, while changing the laser travel speed v (m / min): (a) spot diameter (b) Spot diameter and point diameter In this additional experiment, a fiber laser oscillator manufactured by TRUMPF (maximum output 7kW, transmission fiber diameter is 0.2mm, and the wavelength is 1070nm).

[0049] Figure 7 (a) to 7(c) show the experimental results. The symbols used here have the same meanings as those used in the above experiments. According to the previous experimental results, relat...

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Abstract

A laser lap welding method, for a galvanized sheet, includes, irradiating a laser beam while traveling at a laser traveling speed (v) mm / sec which leads a power per volume in unit time of the laser beam within a range from 0.07 to 0.11 kWsec / mm3 when the laser beam has a power (P) which is not less than 7 kW and an irradiation spot diameter which is not less than 0.4 mm and a galvanized steel sheet has a thickness (t) mm, so that an elongated hole is formed in a molten pool extending backward from a laser irradiation spot at least in the steel sheet on the outer surface side, whereby metal vapor produced by laser irradiation is vented through the elongated hole backward in a laser traveling direction and in a direction towards a laser irradiation source.

Description

technical field [0001] The invention relates to a laser lap welding method for galvanized steel sheets. Background technique [0002] In various industries such as the automobile industry, galvanized steel sheets are widely used because of their high specific strength, low cost, and excellent corrosion resistance. Especially in fields such as the automobile industry, attempts have been made to employ laser beam welding when stacking and welding together a plurality of galvanized steel sheets, which has advantages such as high precision, high quality, and rapid processing compared with spot welding, etc. and other excellent performance. [0003] When galvanized steel sheets are stacked and laser welded (hereinafter, such welding is simply referred to as "laser lap welding"), for example, by bonding the opposite galvanized layers of two adjacent galvanized steel Zinc steel sheets are stacked one on top of the other and irradiated with a laser beam such as a carbon dioxide la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/20B23K26/32B23K26/21B23K26/00
CPCB23K2201/34B23K26/246B23K26/3293B23K26/244B23K2101/34B23K2103/08
Inventor 萩原宰团刚良
Owner SUZUKI MOTOR CORP
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