NARROW GROOVE BUTT WELDING METHOD FOR THICK STEEL PLATE

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PROBLEM TO BE SOLVED : To provide a welding method that excels in arc stability even in the initial layer (i.e., bottom of a groove) of multi-layer welding and that enables stable penetration to be obtained, in performing narrow groove butt welding for a thick steel plate by a gas shielded arc welding method. SOLUTION : In the narrow groove butt welding method in which multi-layer gas shielded arc welding is performed on a thick steel plate using a welding steel wire composed of a steel wire containing 0.015-0.100 mass% rare earth elements; the gas shielded arc welding of the initial layer is performed under the conditions that a QL value determined by QL=I×E/[S×(G+5×tan[!theta!])]/60 satisfies in the range of 1.5-10.0 and that a QH value determined by QH=[G×S×60×(G+tan[!theta!])/(I×E)]+tan[!theta!] satisfies in the range ≥1.0. COPYRIGHT : (C)2007, JPO&INPIT