Patent ID: 6444059
Filing Date: 2002-09-03
Classification: C22C

Abstract:
A welded construction comprising first and second sections made of AlMgMn aluminum alloy welded together to form a joint having a hardness >80 Hv, said alloy consisting essentially of (% by weight):4.30.5Fe<0.20 Si<0.25 Zn<0.40 Cr<0.25 Cu<0.20 Ti<0.20 Zr<0.20 wherein Mn+2Zn>0.75, each of said sections having been formed by casting, homogenizing, hot rolling and optionally cold rolling, wherein the welded joint, when prepared by continuous automatic MIG butt welding with a symmetrical bevel having an inclination of 45Â° to vertical over a thickness of 4 mm and with filler wire of 5183 alloy, determined by a tensile test on standardized DNV test pieces having a length of 140 mm and a width of 35 mm, a center weld bead with a width of 15 mm, and a length of a narrow portion which is the sum of bead width and twice section thickness, has a yield stress Rm greater than 300 MPa.