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REINFORCING METHOD FOR WELDED JOINT OR STAINLESS STEEL PIPE AND CONSTRUCTION OF WELDED JOIN OF STAINLESS STEEL PIPE
REINFORCING METHOD FOR WELDED JOINT OR STAINLESS STEEL PIPE AND CONSTRUCTION OF WELDED JOIN OF STAINLESS STEEL PIPE
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机译：焊接接头或不锈钢管的补强方法及焊接接头的施工
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摘要
PURPOSE:To make possible the repair to be easily carried out, when repairing the weld zone of austenitic stainless steel pipe suffering from the stress corrosion cracking, by forming the deposited metal layer of higher corrosion resisting metal on the outside surface to be welded of the steel pipe, and then, by carrying out the butt welding before jointing the restraining metallic part through welding work. CONSTITUTION:On the outside surface of austenitic stainless steel pipe 1 whose inside wall surface is exposed to a corrosive environment, at the zone where the stress corrosion cracking 4 is detected, an overlay welding is applied using a welding electrode of higher corrosion resisting metal than this stainless steel pipe, AISI308L of carbon content under 0.035%, for instance; hereby, the deposited metal layer of the overlaid metal 8 is formed. Next, the butt welding 2 is applied to this deposited metal layer and the part to be welded, and then, the restraining metallic part 9 is jointed to the deposited metal layer 8 by welding. Hereupon, the restraining metallic part 9 is heated up to 300-400 deg.C, and the cooling medium is preferably passed through inside of the steel pipe; under this condition, the welding 14 is carried out with the welding electrode of AISI308L stainless containing carbon under 0.035%.
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