| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrogas arc welding method of steel plate which is applied to the welding of a T-joint, capable of improving the shape of face and back beads, and capable of obtaining excellent penetration depth. SOLUTION: An end face of a second steel plate 22 having the thickness T of >=15mm is directed toward the surface of a first steel plate 21, and a strap is placed on a face side and a back side of a T-joint in which the groove angleθis 0 to 40 deg. and the root gap is 3 to 15mm, and the groove width W on the face side is <=45mm, and the single oscillation weaving welding is performed in the thickness direction of the second steel plate with the current of 300 to 600A using a flux-cored wire of 1.4 to 2.0mm in diameter P. Where the wire stop times in the face and back sides are Sa , Sb respectively, the torch angleλis 22.5-0.5θto 30, Sa is W/10+0.05λ-2P+(2.2-3.7), the ratio of the wire stop time Sb Sa is 0.4 to 0.7, and the weaving width Z is T-15 to T-3.
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