US 12,390,892 B2
Welding wires for obtaining giga-grade welds, welded structures manufacturing using same, and welding method thereof
Gyu-Yeol Bae, Incheon (KR); and Hong-Chul Jeong, Pohang-si (KR)
Assigned to POSCO, Pohang-si (KR)
Appl. No. 17/790,801
Filed by POSCO, Pohang-si (KR)
PCT Filed Apr. 23, 2021, PCT No. PCT/KR2021/005162
§ 371(c)(1), (2) Date Jul. 5, 2022,
PCT Pub. No. WO2021/221393, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 10-2020-0051506 (KR), filed on Apr. 28, 2020; and application No. 10-2021-0045896 (KR), filed on Apr. 8, 2021.
Prior Publication US 2023/0356334 A1, Nov. 9, 2023
Int. Cl. B23K 35/30 (2006.01); B23K 9/173 (2006.01); B23K 9/23 (2006.01); B23K 35/02 (2006.01); B23K 101/18 (2006.01); B23K 101/34 (2006.01); B23K 103/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/22 (2006.01); C22C 38/38 (2006.01)
CPC B23K 35/3086 (2013.01) [B23K 9/173 (2013.01); B23K 9/23 (2013.01); B23K 35/0261 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/22 (2013.01); C22C 38/38 (2013.01); B23K 2101/18 (2018.08); B23K 2101/34 (2018.08); B23K 2103/04 (2018.08)] 18 Claims
OG exemplary drawing
 
1. A gas-shielded arc welding wire comprising:
by mass % of a whole wire, 0.08 to 0.15% of C; 0.001% to 0.1% of Si; 1.6 to 1.9% of Mn; 0.015% or less of P; 0.015% or less of S; 4.0 to 5.2% of Cr; 0.4 to 0.65% of Mo, and the remainder of Fe and unavoidable impurities, wherein a value X defined by the following Relational Expression 1 satisfies a range of 0.7 to 1.1%,
X (%)=[Cr]/10+[Mo]−4x[Si]/[Mn], wherein,  [Relational Expression 1]
in Relational Expression 1, [Cr], [Mo], [Si] and [Mn] represent mass % of each element.