Showing papers on "Cold welding published in 1975"

Electron beam welding technique for joining two workpieces together

Abstract: In the preparation of plane or curved workpieces for welding together by means of an electron beam and wherein the weld takes the form of a full penetration joint, fusion lips are provided at the place where the lower welding bead forms. In the case where the workpieces are constituted by rotationally symmetrical thick-walled hollow bodies such as rotor discs for construction of turbo-machines which upon welding together form a closed cavity, the fusion lips have an annular configuration and are located at the inner radial contour of the welding interface. The workpieces are also provided with an arrangement for centering the lips and a metal foil is inserted between the lips to improve the toughness of the weld material, the foil having a carbon content lower than that of the parent metal of the workpieces.

Method of vertical welding of aluminum and aluminum alloys

Abstract: A method of vertical welding of aluminum and aluminum alloys comprising welding Al or an Al alloy while oscillating in a welding groove an electrode in a closed pattern corresponding substantially to the groove shape, wherein the welding is conducted by using a welding current higher by 10 to 150 A than the base welding current at least during the course of oscillation of the electrode along the groove face of one of the materials to be welded while the electrode is pursuing courses of oscillation along both groove faces of the materials to be welded.

Jointing for terminal connector parts - is by cold friction welding for intimate union of copper or aluminium

Abstract: The production method for terminal connectors or inter-connectors for the connection of Cu- with Al-conductors of electrical lines producing a superior compound structure between the two metals is achieved by that both connector parts are joined by cold welding or friction welding. An intimate intermolecular union results between the two parts. Large temperature variations such as caused by current flow or sun radiation or by strong under-cooling do not destroy or reduce the conductive properties of the joint. Pre-fabricated terminal or interconnector parts of the same metal, i.e. Al to Al or Cu to Cu, may also be cold welded or friction welded with the same result.

Fabrication of flexible superconducting Nb3Al tape

Abstract: Flexible tapes of Nb3Al were prepared by cold welding sheets of niobium and aluminum in a rolling mill followed by a brief high‐temperature heat treatment. They were also prepared by a vapor deposition process followed by heat treatment under a high aluminumvapor pressure.Superconducting layers were typically 1 mil thick and had T c ’s in the range 16–18 K. J c (H) measurements indicate that properly prepared Nb3Al tapes can carry large current densities (8×104 A/cm2 at 70 kOe). Present research shows that considerable metallurgical difficulties, associated with the high reaction temperatures and brittleness of the Nb3Al phase, need to be overcome before these processes can become commercial.