This new welding tool is intended for butt‐welding wires, particularly aluminium and copper, from 0·036 inches to 0·064 inches in diameter. It is a recent addition to the range of equipment made by the General Electric Co. Ltd., for cold pressure welding. With this technique, which was developed at the G.E.C. Research laboratories, aluminium and copper wires can be welded by pressure alone, no heat being required; the joints obtained have a mechanical strength and an electrical conductivity equivalent to those of the parent wire. Certain aluminium alloys such as Silmalee can also be welded in this way. The technique was developed by the G.E.C. as a convenient method of joining aluminium conductor which is now being used on an increasing scale. A second welding tool covers the welding of wires from 0·080 to 0·144 inches.
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