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 aluminium 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: 0.25-1.0; Mg: 0.05-0.8; Mn: ≤0.70; Cr: ≤0.35; Ti: 0.02-0.30; Sr up to 500 ppm; Na up to 200 ppm; Sb up to 0.15%, unavoidable 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.

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 aluminium 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: 0.25-1.0; Mg: 0.05-0.8; Mn: ≤0.70; Cr: ≤0.35; Ti: 0.02-0.30; Sr up to 500 ppm; Na up to 200 ppm; Sb up to 0.15%, unavoidable 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.

The invention concerns an aluminum extruded product as feedstock for forging comprising in weight percent Si: 0.6% to 1.4%, Fe: 0.01% to 0.15%, Cu: 0.05% to 0.60%, Mn: 0.4% to 1%, Mg: 0.4% to 1.2%, Cr: 0.05% to 0.25%, Zn≤0.2%, Ti≤0.1%, Zr≤0.05%, the rest being aluminium and unavoidable impurities having a content of less than 0.05% each, total being less than 0.15%, wherein the number density of Mn containing dispersed particles is at least equal to 2.5 particles per μm.sup.2, preferably 3.0 particles per μm. The invention also concerns the process to obtain the aluminum extruded product as feedstock for forging.

The invention concerns an aluminum extruded product as feedstock for forging comprising in weight percent Si: 0.6% to 1.4%, Fe: 0.01% to 0.15%, Cu: 0.05% to 0.60%, Mn: 0.4% to 1%, Mg: 0.4% to 1.2%, Cr: 0.05% to 0.25%, Zn≤0.2%, Ti≤0.1%, Zr≤0.05%, the rest being aluminium and unavoidable impurities having a content of less than 0.05% each, total being less than 0.15%, wherein the number density of Mn containing dispersed particles is at least equal to 2.5 particles per μm.sup.2, preferably 3.0 particles per μm. The invention also concerns the process to obtain the aluminum extruded product as feedstock for forging.

An aluminum alloy and applications thereof are disclosed. Based on the total weight of the aluminum alloy, the aluminum alloy includes: 8-11% of Si, 2-4% of Cu, 0.6-4% of Zn, 0.65-1.1% of Mn, 0.35-0.65% of Mg, 0.001-0.05% of Cr, 0.01-0.03% of Sr, 0.08-0.12% of Ti, 0.008-0.02% of B, 0.1-0.3% of Fe, 0.01-0.02% of Ga, 0.008-0.015% of Sn, and the balance of Al and less than 0.1% of other elements.

New 3xx aluminum casting alloys are disclosed. The aluminum casting alloys generally include from 6.5 to 11.0 wt. % Si, from 0.20 to 0.80 wt. % Mg, from 0.05 to 0.50 wt. % Cu, from 0.10 to 0.80 wt. % Mn, from 0.005 to 0.05 wt. % Sr, up to 0.25 wt. % Ti, up to 0.30 wt. % Fe, and up to 0.20 wt. % Zn, the balance being aluminum and impurities.

New 3xx aluminum casting alloys are disclosed. The aluminum casting alloys generally include from 6.5 to 11.0 wt. % Si, from 0.20 to 0.80 wt. % Mg, from 0.05 to 0.50 wt. % Cu, from 0.10 to 0.80 wt. % Mn, from 0.005 to 0.05 wt. % Sr, up to 0.25 wt. % Ti, up to 0.30 wt. % Fe, and up to 0.20 wt. % Zn, the balance being aluminum and impurities.

In a brazing sheet manufacturing method, a cladding slab is prepared by overlaying at least a core-material slab composed of an aluminum material and a filler-material slab composed of an Al—Si series alloy, in which a metal element that oxidizes more readily than Al is included in at least one of the slabs. A clad sheet is prepared by hot rolling this cladding slab, which then has at least a core material layer composed of the core-material slab and a filler material layer composed of the filler-material slab and disposed on at least one side of the core material. Then, a surface of the clad sheet is etched using a liquid etchant that contains an acid. Subsequently, the clad sheet is cold rolled to a desired thickness. In flux-free brazing, such a brazing sheet is capable of curtailing degradation in brazeability caused by fluctuations in dew point and oxygen concentration.

Brazing strip or sheet comprising: a core layer made of aluminum alloy; a brazing layer made of aluminum alloy, clad on at least one face of the core layer; optionally an intermediate layer made of aluminum alloy, clad on at least one face either between the core layer and the brazing layer or the core layer without any other layer on top; characterized in that the brazing layer alloy comprises, in mass percentages:
from 7 to 13% Si, at most 0.8% Fe, at most 0.45% Cu, at most 0.20% Mn, at most 0.15% Mg, at most 0.20% Zn, at most 0.20% Ti, at most 0.04% Bi, from 0.01 to 0.10% Y, from 0.01 to 0.10% Sn, remainder aluminum and impurities.

Brazing strip or sheet comprising: a core layer made of aluminum alloy; a brazing layer made of aluminum alloy, clad on at least one face of the core layer; optionally an intermediate layer made of aluminum alloy, clad on at least one face either between the core layer and the brazing layer or the core layer without any other layer on top; characterized in that the brazing layer alloy comprises, in mass percentages:
from 7 to 13% Si, at most 0.8% Fe, at most 0.45% Cu, at most 0.20% Mn, at most 0.15% Mg, at most 0.20% Zn, at most 0.20% Ti, at most 0.04% Bi, from 0.01 to 0.10% Y, from 0.01 to 0.10% Sn, remainder aluminum and impurities.