| 摘要 |
PROBLEM TO BE SOLVED: To provide fused flux for submerged arc welding which is excellent in the performance of high-speed two-side single-layer welding and also lessens oxygen content in weld metal without causing high basification. SOLUTION: The fused flux for submerged arc welding contains, based on total mass of flux, 23-33 mass% SiO<SB>2</SB>, 5-25 mass% Ca compound (in Ca terms), 5-35 mass% Ba compound (in Ba terms), 1-14 mass% F compound (in F terms), 7-18 mass% MgO, 1-13 mass% Al<SB>2</SB>O<SB>3</SB>, 1-9 mass% MnO, 0.5-5.0 mass% ZrO<SB>2</SB>, 0.5-5.0 mass% FeO and TiO<SB>2</SB>limited to 8 mass% or less, with a total of Ca compound and Ba compound limited to 40 mass% or less, and the values of [M], [N] and [P] obtained from the following expressions are made to be 300 or less, more than 0, and 0 or less respectively:[M]=1,050-[SiO<SB>2</SB>]-19×[Ca]-12×[Ba]-5×[F]-15×[MgO]-5×[Al<SB>2</SB>O<SB>3</SB>]-5×[MnO]-3×[ZrO<SB>2</SB>]-5×[FeO]-3×[TiO<SB>2</SB>]. [N]=32.5-(3/4)×([Ca]×[Ba])-[F]. [P]=[Ca]-(20/3)×[MgO]+31. COPYRIGHT: (C)2006,JPO&NCIPI
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