GB1097151A - Improvements in or relating to explosive welding - Google Patents

Abstract

1,097,151. Welding by pressure. DYNAMIT NOBEL A.G. Jan. 15, 1965 [Jan. 17, 1964], No. 2014/65. Heading B3R. In explosively welding metal plates, the plates are superposed in spaced relationship, a layer of explosive is disposed on one plate to have a thickness at a position on the periphery of the explosive most remote from the position on the periphery of the explosive at which it is to be detonated which is from 50-70% of the height of the surface of the layer above the one plate at the ignition position and a thickness in marginal strips extending along the edges of the explosive layer adjacent the ignition position which is from 5-20% less than the height of the surface of the layer above the one plate at the ignition position and the explosive is detonated. The explosive may be detonated at a corner or at an edge, when at a corner the plates may be square, are in parallel or nonparallel arrangement and spacers are all welded to the plate remote from the plate carrying the explosive and when at an edge the plates are non-parallel and spacers are welded to the plate not carrying the explosive at a position remote from the ignition edge but are not welded at the other positions. The spacers, of metal, may each be in the form of a right angled triangle and the plate carrying the explosive rests on the hypotenuse of the triangle and slides down after detonation. The explosive may be in sheet, powder or plastic form and the plates may be of corrosion resistant steels, chrome-nickel steels, titanium or tantalum steels, lead, copper, aluminium and gold, silver or copper-nickel alloy on brass or copperzinc alloy. In an example a 20 mm. thick rectangular chromium-nickel steel plate and a 200 mm. thick rectangular boiler plate are positioned by metal triangular spacers arranged around the periphery of the plates to be spaced by 3 mm. at one pair of edges with the spacing increasing to 20 mm. at the opposite pair of edges. PETN explosive is distributed on one of the plates to have a height of 80 mm. above the chromium-nickel steel plate at the ignition edge adjacent the closely spaced edges, 50 mm. at the opposite edges and 70 mm. along each marginal strip between the mentioned edges. The explosive is ignited to weld the plates together. Two metal plates 1, 2 are superposed in oblique spaced relationship by separate steel spacers 3 (only one of which is shown) around the periphery of the plates and the explosive 4 is disposed on plate 1 to be detonated by edge ignition along edge 5 by a fuse 6 and an igniting explosive 6a. The spacers are welded to the plate 2 along the edge 2b. The height above plate 1 of the surface of the explosive at edge 9 is 50-70% of the height of the explosive surface at edge 5 and the height above plate 1 of the surface of the explosive in marginal strips along the edges between edges 5 and 9 is from 5-20% less than the height at edge 5. The central surface of the explosive may be planar 10 or parabolic 11.