| 摘要 |
PROBLEM TO BE SOLVED: To provide a low hydrogen covered electrode for a welder using DC power source, capable of obtaining a welded structure whose weld metal is excellent in crack resistance and low temperature toughness when welding high-tensile steel having a 0.2% proof stress of≥830 MPa. SOLUTION: The electrode includes, by mass% to the total mass of the electrode, 0.05-0.15% C, 0.3-2.5% Si, 0.5-2.5% Mn, 1.0-5.0% Ni, >0.30% and≤0.80% Ti, 0.002-0.08% Al, 0.02-0.20% Cr, and the balance Fe, an arc stabilizing agent, a slag generating agent, a binder, and inevitable impurities. The slag generating agent includes, by mass% to the total mass of a coating flux, at least 30-60% metal carbonate and 11-23% metal fluoride. The coating ratio that is expressed by the ratio of the mass of the coating flux to the total mass of the electrode is 25-45 mass%. COPYRIGHT: (C)2010,JPO&INPIT
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