Abstract: Structural members (80) having an intermediate web (81) and hollow tubular side flanges (83, 85) extending longitudinally of the web (81) are formed in a cold rolling operation such that one of the tubular side flanges (83) has an outside diameter of the opposite tubular side flange (85). The larger diameter side flange (85) has a longitudinally slotted aperture (87) to permit a composite structure (120) to be formed by nesting the smaller diameter flange (83) in the larger diameter flange (85) of an adjacent structural member (80). The composite structure (120) having a plurality of interconnected structural members (80) may be assembled as a closed or open structure.

Abstract: Copper roofing panels and like contoured articles are formed from copper sheets electrolytically deposited on an electrode during an electrowinning process. The contoured roofing panels are formed by pressing planar copper sheets stripped from an electrode or by pressing a laminate of copper sheet and a plastics substrate. In an alternative embodiment, roofing panels are formed by electrodeposition of copper onto a contoured electrode.

Abstract: A multiple component structural member is made by cold roll forming two continuous strips of metal on opposite sides of a third continuous strip of metal. The cold rolling process creates two hollow flange elements with a continuous aperture in which the edges of the third continuous strip of metal is partly extended, followed by resistance or induction welding to create the multiple component structural member.

Abstract: A structural member which comprises a pair of hollow end sections and an intermediate web characterized in that each hollow end section is welded to the intermediate web so as to form two weld lines or joins extending along the structural member. Suitably the intermediate web is predominantly planar and the structural member is formed from a unitary sheet of metal having opposed edges whereby a respective edge is located adjacent said intermediate web and is welded thereto to form said weld lines or weld joins.

Abstract: A structural member which comprises a pair of hollow end sections and an intermediate web characterized in that each hollow end section is welded to the intermediate web so as to form two weld lines or joins extending along the structural member. Suitably the intermediate web is predominantly planar and the structural member is formed from a unitary sheet of metal having opposed edges whereby a respective edge is located adjacent the intermediate web and is welded thereto form the weld lines or weld joins.