| 摘要 |
A method for fillet arc welding of high-strength thin steel sheet is provided that enables excellent weld toe shape and improved weld joint fatigue properties even at a welding speed from greater than 110 cm/min to not greater than 150 cm/min. When conducting fillet arc welding of high-strength thin steel sheet of a tensile strength of 700 MPa or greater by gas shielded arc welding at a welding speed from greater than 110 cm/min to not greater than 150 cm/min, the method of the present invention uses as the steel sheet one containing C = 0.02 - 0.15%, Si = 0.2 - 1.8% and Mn = 0.5 - 2.5%, and combines the steel sheet with a wire used for the fillet arc welding to make {Si (steel sheet) + 0.1 x Si (wire)} > 0.32, where Si (steel sheet) is the Si content (mass%)of the steel sheet and Si (wire) is the Si content (mass%) of the wire for welding. |
