Abstract:
Disclosed is a friction stir welding technique which avoids occurrence of a dent, in a joining region, extending to a level beneath the joined surfaces. At end portions of the frame members to be joined, at the joining region, thickened parts which project toward the rotary body joining tool are provided. Two adjoining thickened parts, of adjacent members to be joined, can form a trapezoid shape. The rotary body joining tool has a small-diameter tip portion and a larger diameter portion. The rotary body joining tool is inserted in the thickened parts. In a state where the rotary body joining tool has been inserted small-diameter tip end first, to a level where the larger diameter portion of the rotary body joining tool overlaps the thickened part but does not extend below the upper surface of the non-thickened surfaces of the members joined, the rotary body is rotated and moved along the joining region. Even when a gap exists between two thickened parts, a desirable joining can be carried out. After the joining, the remaining parts of the thickened parts can be machined so as to form a smooth surface.
Abstract:
In a roller seam welding machine, the upper welding roller is led through a welding-force adjustment device with two spring elements. One spring is already effective when the initial deflection of the welding roller occurs. The other spring comes into operation only when a certain deflection (D) is reached. A marked improvement in weld quality can be obtained in this way, particularly at the start of the weld seam.
Abstract:
A method of fabricating a truss core sandwich panel of the type including first and second face sheets secured on opposite sides of a corrugated sheet. The first face sheet is welded to one side of the corrugated sheet and the second face sheet is positioned in contact with the other side of the corrugated sheet. A conductive mandrel is positioned between the first face sheet and the corrugated sheet, the height of the mandrel being less than the distance between the first face sheet and the corrugated sheet by a predetermined amount. The first and second face sheets are positioned between opposed welding electrodes, with the mandrel being coplanar with the electrodes. A welding force is applied to the first and second face sheets by means of the electrodes, the force being sufficient to deflect the first face sheet into contact with the mandrel and to bring the mandrel into contact with the corrugated sheet to permit electrical continuity between the electrodes. The predetermined amount is such that the deflection of the first face sheet will not exceed the yield point of the material thereof. A current is passed between the first and second electrodes to weld the second face sheet to the corrugated sheet and the welding force is released. The mandrel is moved to a new location and the process is repeated.
Abstract:
A welding machine for fabricating metal sandwich panels having corrugated core, comprising a set of rules for offering up the core, TIG welding blowpipes positioned in a channel at the location where the core is covered with skin strip, HF-ignition welding generators, HF generators in immediate vicinity to the blowpipes, a weld sequencing block, said machine being disposed in order that the core strip is covered subsequent to being corrugated and is then welded beneath the TIG welding blowpipes, electrodes being positioned outside the core.
Abstract:
A method of manufacturing an optical probe for use in ophthalmic procedures can comprise: positioning a ferrule within a proximal portion of a cannula, wherein an optical fiber extends at least partially through the ferrule towards an optical element disposed within a distal portion of the cannula; and coupling the cannula to the ferrule by applying laser energy to the cannula. An optical probe can be provided that includes a cannula including a proximal portion and a distal portion; a ferrule disposed within the proximal portion of the cannula, the cannula and the ferrule coupled together by engaged deformations in the cannula and the ferrule; and an optical fiber positioned at least partially within the optical probe, the optical fiber configured to receive a light from a light source and guide the light to an optical element positioned within the distal portion of the cannula.
Abstract:
A method of superplastic forming of titanium packs and an associated assembly is provided. The titanium packs can include sheets (14, 16) having different granular structures so that the different sheets (14, 16) are adapted to superplastically form at different temperatures. One or more of the sheets (14, 16) can be formed at a temperature that is below the superplastic forming temperature of another sheet (14, 16) in the pack. In some cases, the occurrence of markoff can be reduced or eliminated. An airframe comprising an aircraft structure manufactured by this method is also described.
Abstract:
A tool for making simultaneously a plurality of parallel friction stir welds includes at least one shank for holding in a chuck or collet of a friction stir welding machine, a plurality of friction stir welding pins, and friction stir welding shoulders including at least four working surfaces adjacent said ins, the shoulders and pins mounted in axial relationship; dimensions of said friction stir welding pins and shanks corresponding to dimensions and spacings of said friction stir welds.
Abstract:
In making a deposited body from a galvanized steel sheet by laser beams, formation of pits in the deposited area is prevented without using a feeler or the like. In forming parent and child doors (1, 2) by suitably cutting and bending a galvanized steel sheet to provide front and rear steel sheets (3, 4) and welding the latter, the deposited area is formed such that, for example, the sheet surface of one steel sheet is abutted against the sheet end surface of the other steel sheet, in such a manner that the front end surface (corresponding to the plate end surface of the invention) (3d), which is the cut plane of the right-hand side bend (3b) of the front steel sheet (3) is abutted against the front surface (sheet surface) of the horizontal right-hand side end edge of the rear steel sheet (4), whereupon the abutted portion is welded by yag laser.
Abstract:
An embodiment provides a method of constructing a cellular structure having nodes therein comprising: providing at least one truss layer comprised of at least one truss unit, at least one of the truss units being comprised of truss members; providing at least one panel in mechanical communication with the at least one truss unit of the at least one truss layer, the mechanical communication defines contact regions wherein the at least one truss unit is coupled to the at least one panel; the nodes being defined as intersections existing among any of the truss members and the nodes also being defined by the contact regions; providing at least one node pin, the at least one node pin spanning between two desired the nodes; and diffusion bonding at least one of the truss layer to the at least one panel. The bonding includes: applying heat, and applying force that results in the truss layer and the panel that are being bonded to be pressed together, the node pins provide support for the structure so as to concentrate or transmit the applied force onto the contact regions.