Kobe Steel, Ltd.

Ryu Kasai

Reiichi Suzuki

Masao Kinefuchi

A fillet weld joint of steel formed by arc welding, wherein a martensitic transformation starting temperature (Ms point) of a weld metal is 400&#xb0; C. or above and 550&#xb0; C. or below, a value obtained by dividing a toe radius &#x3c1; of a toe part of welding by a sheet thickness t of a base metal (&#x3c1;/t) is 0.25 or above, an expression Ms(&#xb0; C.)&#x2266;375&#xd7;[&#x3c1;/t]+320 is satisfied, and a crack defect does not exist in the fillet weld joint.

Fillet weld joint and method for gas shielded arc welding

Arc welding is performed with a flux-cored welding wire using pure Ar shielding gas with a pulsed current having a peak current of 340 to 540 A and a peak current time of 0.7 to 2.5 ms as a welding current, in which the wire includes a carbon-steel sheath and contains, on a mass percent basis, 0.02% to 0.15% C, 0.30% to 1.50% Si, 0.70% to 2.30% Mn, 0.010% to 0.100% S, 0.01% to 0.18% Ti, 0.030% or less P, and 0.15% or less Cr, with respect to the total mass of the wire, in which the wire has a flux content of 10.0% to 30.0%, the flux has a S content of 0.030% to 0.600%, and the wire satisfies [S]&#x3e;([S]+0.010), where [S] represents the S content (%) of the flux, and [S] represents the S content (%) of the sheath.

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Fujisawa, Japan

Ryu Kasai