To provide a low-hydrogen coated electrode which can obtain a weld metal having excellent cracking resistance and low-temperature toughness in welding of a high-tensile steel with a yield strength of 690 MPa class or more, and which ensures good weldability in all position welding.
In the low-hydrogen coated electrode, a coating ratio is 25 to 45%. A steel core wire contains 0.06% by mass or less of C relative to the total mass of the steel core wire. The coating flux contains, relative to the total mass of the coating flux, 14.7 to 22.4% by mass of metal carbonate (in terms of CO2), 13.1 to 24.8% by mass of CaF2, 0 to 8% by mass of TiO2, 0 to 8% by mass of ZrO2, 1.1 to 3.0% by mass of SiO2, 0 to 0.8% by mass of Al2O3, 0.01 to 0.05% by mass of C, 2.5 to 6.0% by mass of Si, 2.2 to 8.0% by mass of Mn, 1.8 to 7.0% by mass of Ni, and 0.2 to 3.7% by mass of Cr+Mo. Where following formula is satisfied: D=8.42-0.18CO2+0.05CaF2+0.50TiO2-1.36SiO2-4.36Al2O3+0.71ZrO23.8.
Next Patent: WORKPIECE SPLITTING METHOD AND OBJECT PRODUCING METHOD