Composite metal panel

A method of manufacturing a rigid composite metal panel, comprising the steps of:

• (a) providing parts, the parts comprising at least two parallel metal members selected from the group consisting of metal plate and metal sheet, and a corrugated aluminium stiffener sheet,
• wherein the corrugated aluminium stiffener sheet is made from an aluminium brazing sheet product comprising a core sheet made of an aluminium alloy having on at least one surface of said core sheet clad an aluminium alloy clad layer, the aluminium alloy clad layer being made of an aluminium alloy comprising silicon in an amount in the range of 2 to 18% by weight, and a layer comprising nickel on an outer surface of said aluminium alloy clad layer;
• (b) assembling the parts into an assembly such that the aluminium stiffener sheet is arranged between the parallel metal members;
• (c) joining the assembly into a rigid composite metal panel by heating the assembly under a vacuum or in an inert atmosphere in the absence of a brazing-flux material at elevated temperature of less than 600° C. for a period long enough for melting and spreading of the molten filler to form a joint between each parallel metal member and the corrugated aluminium stiffener sheet;
• (d) cooling of the joined composite metal panel.

A method of manufacturing a rigid composite metal panel, comprising the steps of:

• (a) providing parts, the parts comprising at least two parallel metal members selected from the group consisting of metal plate and metal sheet, and an aluminium stiffener sheet having a honeycomb structure arranged between said parallel metal members,
• wherein the aluminium stiffener sheet is made from an aluminium brazing sheet product comprising a core sheet made of an aluminium alloy having on at least one surface of said core sheet clad an aluminium alloy clad layer, the aluminium alloy clad layer being made of an aluminium alloy comprising silicon in an amount in the range of 2 to 18% by weight and a layer comprising nickel on an outer surface of said aluminium alloy clad layer;
• (b) assembling the parts into an assembly such that the aluminium stiffener sheet is arranged between the parallel metal members;
• (c) joining the assembly into a rigid composite metal panel by heating the assembly under a vacuum or in an inert atmosphere in the absence of a brazing-flux material at elevated temperature of less than 600° C. for a period long enough for melting and spreading of the molten filler to form a joint between each parallel metal member and the corrugated aluminium stiffener sheet;
• (d) cooling of the joined composite metal panel.

A method of manufacturing a rigid composite metal panel, comprising the steps of:

• (a) providing parts, the parts comprising at least two parallel metal members selected from the group consisting of metal plate and metal sheet, and a corrugated aluminium stiffener sheet,
• wherein the corrugated aluminium stiffener sheet is made from an aluminium brazing sheet product and said aluminium brazing sheet product comprises:
• a core sheet made of an aluminium alloy having on at least one surface of said core sheet clad an aluminium alloy clad layer, said aluminium alloy clad layer being made of an aluminium alloy comprising silicon in an amount in the range of 2 to 18% by weight,
• a layer comprising nickel on an outer surface of said aluminium alloy clad layer, and
• a separately deposited metal layer on one side of said layer comprising nickel, wherein said separately deposited metal layer comprises a metal such that taken together said aluminium alloy clad layer and all layers of the aluminium brazing sheet product exterior thereto form a metal filler having a liquidus temperature in the range of 490 to 570° C.;
• (b) assembling the parts into an assembly such that the aluminium stiffener sheet is arranged between the parallel metal members;
• (c) joining the assembly into a rigid composite metal panel by heating the assembly under a vacuum or in an inert atmosphere in the absence of a brazing-flux material at elevated temperature of less than 600° C. for a period long enough for melting and spreading of the molten filler to form a joint between each parallel metal member and the corrugated aluminium stiffener sheet;
• (d) cooling of the joined composite metal panel.