Laser welding of Al55-Zn coated steel sheet

Sánchez-Fortún, José Manuel de Amo; Durán, J.; Chao, Jesús; Fernández-Sáez, J.

doi:10.1007/bf00356267

Cited by 8 publications

(1 citation statement)

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“…Due to this discrepancy, problems occur during overlap laser welding of galvanized sheets: vaporization of the zinc might displace liquid steel, and vapour can get trapped in the weld and create porosities [3] [4]. Several studies have dealt with this problem by creating a gap between sheets to enable off-gassing of the vapour without disturbing the weld pool, or by adjusting other parameters to reduce the size and the number of defects [5] [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Laser Welding Process in Butt-Joint Configurations

Jacques¹,

Ouafi²

2017

WJET

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This paper presents an experimental investigation of laser welding low carbon galvanized steel in butt-joint configurations. The experimental work is focused on the effects of various laser welding parameters on the welds quality. The investigations are based on a structured experimental design using the Taguchi method. Welding experiments are conducted using a 3 kW Nd:YAG laser source. The selected laser welding parameters (laser power, welding speed, laser fiber diameter, gap between sheets and sheet thickness) are combined and used to evaluate the variation of four weld quality attributes (bead width, penetration depth, underfill and hardness) and to identify the possible relationship between welding parameters and weld physical and geometrical attributes. The effects of these parameters are studied using ANOVA to find their contributions to the variation of different weld characteristics. Plots of the main effects and the interaction effects are also used to understand the influence of the welding parameters. The results reveal that all welding parameters are relevant to bead width (BDW) and depth of penetration (DOP) with a relative predominance of laser power and welding speed. The effect of laser fiber diameter on penetration depth is insignificant. Typical gap-dependent weld shapes show that a small gap results in a narrower and deeper weld. Due to the standard sheared edge, an underfill between 5% and 10% occurs for no-gap experiments. The resulting hardness values are relatively similar for all the experimental tests.

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