Laser spot welding of laser textured steel to aluminium

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• 作者：Goncalo Pardal^a ; ^{g.n.rodriguespardal@cranfield.ac.uk} ; Sonia Meco^a ; Andrew Dunn^b ; ^c ; Stewart Williams^a ; Supriyo Ganguly^a ; Duncan P. Hand^b ; Krystian L. Wlodarczyk^b
• 关键词：Laser processing ; Laser texturing ; Laser spot welding ; Surface modification ; Dissimilar metals
• 刊名：Journal of Materials Processing Technology
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：241
• 期：Complete
• 页码：24-35
• 全文大小：4901 K
• 卷排序：241

文摘

Laser welding of dissimilar metals (steel and aluminium) was investigated with the aim to increase the maximum tensile shear load of the Fe-Al joints. The increase was achieved by texturing the surface of steel prior to the laser spot welding process which was performed in a lap-joint configuration with the steel positioned on top of the aluminium and with a texture faced down to the aluminium surface. This configuration enabled an increase of the bonding area of the joints, because the molten aluminium filled in the gaps of the texture, without the need of increasing the process energy which typically leads to the growth of the intermetallic compounds. Different textures (containing hexagonally arranged craters, parallel lines, grid and spiral patterns) were tested with different laser welding parameters. The Fe-Al joints obtained with the textured steel were found to have up to 25% higher maximum tensile-shear load than the joints obtained with the untextured steel.