| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-hydrogen type coated arc welding electrode which shows excellent arc stability, without occurrence of arc breakage, in back wave welding, e.g. circumferential welding of steel pipes by using a DC power supply and provides a good back wave bead.SOLUTION: In a low-hydrogen type coated arc welding electrode consisting of a steel core wire coated with a coating agent, a coating agent which comprises, by mass% relative to the total mass of the coating agent, 0.20-0.35% of C, a total content of 40-55% of one or more metal carbonates, a total content of 4-11% of one or more metal fluorides, 3-9% rutile, 4-10% potassium feldspar, 4-7%, based on the Si conversion value, of one or more metallic Si and Si alloys and 1.5-5.0%, based on the Mn conversion value, of one or more metallic Mn and Mn alloys is applied to a steel core wire containing 0.06-0.11%, by mass% relative to the total mass of the steel core wire, of C. |
