Aluminium alloy for laser welding without filler wire

Abstract

The invention relates to a process for laser welding monolithic semi-finished products made of aluminium alloy without filler wire, known to a person skilled in the art under the name "Remote Laser Welding" comprising the following steps: - supplying at least two semi-finished products made of alumini- um alloy, at least one of which is a laminated plate with the composition (% by weight): Si: 2.5-14; Fe: 0.05-0.8; Cu: 0.25 <com:Math><semantics>−1.0<annotation encoding="application / x-tex">-1.0< / annotation>< / semantics>< / com:Math>; Mg: 0.05-0.8; Mn: <com:Math><semantics>≤<annotation encoding="application / x-tex">\le< / annotation>< / semantics>< / com:Math>0.70; Cr: <com:Math><semantics>≤<annotation encoding="application / x-tex">\leq< / annotation>< / semantics>< / com:Math>0.35; Ti: 0.02-0.30; Sr up to 500 ppm; Na up to 200 ppm; Sb up to 0.15%, un- avoidable impurities < 0.05 each and < 0.15 in total, remainder aluminium, - laser welding the semi-finished products made of aluminium alloy without filler wire, which process is known to a person skilled in the art under the name "Remote Laser Welding". The invention also includes a structural, body-in-white, skin or opening component of a motor vehicle obtained by a process according to the invention.