To achieve universal welding of thermoplastic workpiece parts with simple equipment, an infrared light transmission welding method is disclosed in which simple polychromatic, incoherent infrared light is generated by a simple infrared light source and is directed through a first workpiece part to a weld point for the purposes of connection to a second workpiece part. In particular, the infrared light is directed through a transparent bracing element.

To achieve universal welding of thermoplastic workpiece parts with simple equipment, an infrared light transmission welding method is disclosed in which simple polychromatic, incoherent infrared light is generated by a simple infrared light source and is directed through a first workpiece part to a weld point for the purposes of connection to a second workpiece part. In particular, the infrared light is directed through a transparent bracing element.

A method for manufacturing a box-shaped structure for aircraft, wherein the structure longitudinally extends between a first axial end and a second axial end and has a first longitudinal wall; a second longitudinal wall; a plurality of spars longitudinally extending between said first wall and second wall; a reinforcing rib transversal to the spars and inserted, between the first and second wall, in the area of a transversal sector interposed between the first axial end and the second axial end; the second wall comprises a main portion and a closing portion, which are coplanar to one another and define two distinct pieces with discontinuity and separated in the area of the transversal sector, so as to facilitate the insertion of the reinforcing rib without jeopardizing the structural properties of the box-shaped structure.

A composite structure forming a load bearing composite shell for a helicopter, with a shell which defines the exterior of a fuselage and includes a central fuselage section and tail boom, a fuselage which is adapted house an engine or drive train, a layered composite crashworthy seat and support structure and a fastening and a method of fastening by providing an adhesive between two layers which is allowed to flow through opposing holes in the layers to provide a chemical and mechanical attachment between the layers.

A composite structure forming a load bearing composite shell for a helicopter, with a shell which defines the exterior of a fuselage and includes a central fuselage section and tail boom, a fuselage which is adapted house an engine or drive train, a layered composite crashworthy seat and support structure and a fastening and a method of fastening by providing an adhesive between two layers which is allowed to flow through opposing holes in the layers to provide a chemical and mechanical attachment between the layers.

A rotary wing aircraft that comprises a structural arrangement with at least one first fiber reinforced polymer component and at least one second fiber reinforced polymer component that are spaced apart from each other by an interspace and that are rigidly attached to an associated structural component, wherein the at least one first fiber reinforced polymer component and the at least one second fiber reinforced polymer component are at least partly interconnected by means of an electrically conductive connection, and wherein the electrically conductive connection comprises at least one sprayed layer of electrically conductive particles, the at least one sprayed layer of electrically conductive particles being provided in the interspace.

A rotary wing aircraft that comprises a structural arrangement with at least one first fiber reinforced polymer component and at least one second fiber reinforced polymer component that are spaced apart from each other by an interspace and that are rigidly attached to an associated structural component, wherein the at least one first fiber reinforced polymer component and the at least one second fiber reinforced polymer component are at least partly interconnected by means of an electrically conductive connection, and wherein the electrically conductive connection comprises at least one sprayed layer of electrically conductive particles, the at least one sprayed layer of electrically conductive particles being provided in the interspace.

A method for the connection of sheet parts, of which at least one is formed as an organic sheet part, with the aid of an auxiliary joining part and an apertured metal washer, the auxiliary joining part having a functional section with an undercut and a piercing section with a shaft surface and a shaft recess. The sheet parts and the metal washer are brought into a stacked arrangement in such a way that the metal washer contacts the organic sheet part. The piercing section slugs are punched out of the stacked sheet parts. The auxiliary joining part is joined to the metal washer. The other of the undercut or of the shaft recess is brought into a holding engagement with a sheet part not formed as an organic sheet metal part or with a further metal washer.

A method for the connection of sheet parts, of which at least one is formed as an organic sheet part, with the aid of an auxiliary joining part and an apertured metal washer, the auxiliary joining part having a functional section with an undercut and a piercing section with a shaft surface and a shaft recess. The sheet parts and the metal washer are brought into a stacked arrangement in such a way that the metal washer contacts the organic sheet part. The piercing section slugs are punched out of the stacked sheet parts. The auxiliary joining part is joined to the metal washer. The other of the undercut or of the shaft recess is brought into a holding engagement with a sheet part not formed as an organic sheet metal part or with a further metal washer.

First and second composite members each containing first discontinuous fibers of fiber length La, are placed such that end surfaces thereof face each other at an interval of first length L1. Ends of the first and second composite members are melted over a second length L2 from the end surfaces. A connecting member containing second discontinuous fibers of fiber length Lb, is melted and placed to bridge a space between the ends, to form a stack. The stack is pressed, whereby the melted connecting member and the melted end portions flow into the space between the end surfaces to form a mixture portion. The mixture portion is cooled and solidified to produce a fiber-reinforced resin bonded body. The first length L1 is equal to or more than of the fiber length Lb, and the second length L2 is equal to or more than the fiber length La.