| 摘要 |
PROBLEM TO BE SOLVED: To provide bonded flux for downward fillet submerged arc welding, a bonded flux that solves conventional technical problems, that enables superior bead appearance and welding workability comparable to fusible flux to be obtained, and that also enables improved mechanical performance of weld metal to be obtained, in fillet welding using bonded flux for submerged arc welding, particularly, in flat fillet submerged arc welding with deep penetration free of groove preparation. SOLUTION: The bonded flux for downward fillet submerged arc welding is characterized in that it contains, by mass%, 5-15% SiO<SB>2</SB>, 12-25% MgO, 3-13% CaO, 1-7% CaF<SB>2</SB>, 8-20% Al<SB>2</SB>O<SB>3</SB>, 16-25% TiO<SB>2</SB>, 0.1-0.5% B<SB>2</SB>O<SB>3</SB>, 5-15% ZrO<SB>2</SB>, 0.5-1.0% Mn, 0.2-3.0% Si and 1.0-6.0% Fe, the balance being CO<SB>2</SB>, alkali metal oxide and unavoidable impurities. The bonded flux is also characterized in that it contains 0.01-0.04% 2Nb+V in one or two kinds of≤0.02% Nb and≤0.01% V. COPYRIGHT: (C)2007,JPO&INPIT
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