Method for butt welding of clad steel, manufacturing method of welded joint, and manufacturing method of welded structure

摘要

Problem to be solved: to enable welding of welding material in the whole posture from the inside of the pipe without the backing work of the back bead, and the welding by welding material which is equal to or equal to the strength of the non corrosion resistant steel in the non corrosion resistant steel side. Problem to be solved: to provide a butt welding method of clad steel capable of compatibility of corrosion resistance and high strength of clad steel pipe.To form an open destination to meet certain conditionsJoining clad steelThe first welding material of which strength is equal to or more than the non corrosion resistant steel is usedFirst layer welding from non corrosion resistant steel.The back bead having an inner bead height Hb with respect to the back bead width WB is formed in the opening of the high corrosion resistance material side to weld the non corrosion-resistant steel side to form Hb / WB < 1;The second welding material with corrosion resistance equal to or higher than that of high corrosion resistant materialBacking bead without workingWelding the high corrosion resistant material sideButt welding method of clad steel.[Orig] Figure 6B