US 12,134,153 B2
Gas-shielded arc welding method and method for manufacturing welded structure
Minoru Miyata, Kanagawa (JP); Reiichi Suzuki, Kanagawa (JP); Hiroshi Matsuda, Tokyo (JP); Rinsei Ikeda, Tokyo (JP); Sachiko Suzuki, Tokyo (JP); and Satoru Ando, Tokyo (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP); and JFE Steel Corporation, Chiyoda-ku (JP)
Appl. No. 16/311,268
Filed by Kobe Steel, Ltd., Kobe (JP); and JFE Steel Corporation, Chiyoda-ku (JP)
PCT Filed Jun. 19, 2017, PCT No. PCT/JP2017/022456
§ 371(c)(1), (2) Date Dec. 19, 2018,
PCT Pub. No. WO2017/221865, PCT Pub. Date Dec. 28, 2017.
Claims priority of application No. 2016-122072 (JP), filed on Jun. 20, 2016.
Prior Publication US 2019/0232417 A1, Aug. 1, 2019
Int. Cl. B23K 9/173 (2006.01); B23K 9/025 (2006.01); B23K 9/23 (2006.01); B23K 35/30 (2006.01); B23K 35/32 (2006.01); B23K 35/38 (2006.01)
CPC B23K 9/173 (2013.01) [B23K 9/025 (2013.01); B23K 9/23 (2013.01); B23K 35/30 (2013.01); B23K 35/32 (2013.01); B23K 35/38 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A gas-shielded arc welding method, comprising:
welding a steel plate having a tensile strength of 780 MPa or more while feeding a consumable electrode via a welding torch and flowing a shielding gas,
wherein the consumable electrode comprises Fe and, in mass % based on a total mass of the consumable electrode,
C in a range of from 0 to 0.20%,
Si in a range of from 0 to 0.50%,
Mn in a range of from 0 to 0.50%,
Cr in a range of from 3.05 to 7.50%,
S in a range of from 0.0020 to 0.0600%, and
Ni in a range of from 0 to 0.30%;
wherein the shielding gas comprises Ar and, in vol. %, at least one selected from CO2 and O2: 1% to 15% in total, and
wherein the welding is performed under conditions satisfying the following relationship (1)
3≤{−0.05×[CO2+O2]}+[Cr]≤7.0  (1),
wherein [Cr] represents a content, in mass %, of Cr in the consumable electrode, and
[CO2+O2] represents a total content, in vol. %, of at least one selected from CO2 and O2 in the shielding gas.