| 摘要 |
PROBLEM TO BE SOLVED: To provide a Ni-based alloy flux-cored wire having excellent pit resistance and excellent welding work efficiency and excellent bead appearance in the horizontal fillet welding or the three o'clock welding of 9% Ni steel or Ni-based alloy, and achieving vertical upward welding. SOLUTION: The flux-cored wire with its shell being formed of Ni-based alloy contains, in its flux, 4.0% by mass in total of TiO<SB>2</SB>, SiO<SB>2</SB>and ZrO<SB>2</SB>to the total mass of the wire and further contains 0.6-1.2% Mn oxide in terms of MnO<SB>2</SB>, wherein when the content, by mass, of TiO<SB>2</SB>, SiO<SB>2</SB>, ZrO<SB>2</SB>and MnO<SB>2</SB>(converted value) is expressed by [TiO<SB>2</SB>], [SiO<SB>2</SB>], [ZrO<SB>2</SB>] and [MnO<SB>2</SB>], the ratio [TiO<SB>2</SB>]/[ZrO<SB>2</SB>] is 2.3-3.3, the ratio [SiO<SB>2</SB>]/[ZrO<SB>2</SB>] is 0.9-1.5, and the ratio ([TiO<SB>2</SB>]+[SiO<SB>2</SB>]+[ZrO<SB>2</SB>])/[MnO<SB>2</SB>] is 5-13. COPYRIGHT: (C)2009,JPO&INPIT
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