Weld backing

摘要

PCT No. PCT/JP93/01290 Sec. 371 Date Aug. 3, 1994 Sec. 102(e) Date Aug. 3, 1994 PCT Filed Sep. 9, 1993 PCT Pub. No. WO94/05458 PCT Pub. Date Mar. 17, 1994.A reusable weld backing capable of withstanding long use, which is held against the underside of a workpiece to provide weld-metal support in full penetration welding, the weld backing comprising a substrate made from copper or a copper alloy; and a copper-aluminum alloy layer containing 9 to 23% by weight of aluminum and formed at least on the surface of the substrate, the surface being on the side which faces a weld zone.