US 12,186,836 B2
Flux-cored wire, welding method, and weld metal
Naoki Mukai, Fujisawa (JP); Shun Izutani, Fujisawa (JP); and Takashi Yashima, Fujisawa (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP)
Appl. No. 17/600,249
Filed by Kobe Steel, Ltd., Kobe (JP)
PCT Filed May 1, 2020, PCT No. PCT/JP2020/018450
§ 371(c)(1), (2) Date Sep. 30, 2021,
PCT Pub. No. WO2020/226146, PCT Pub. Date Nov. 12, 2020.
Claims priority of application No. 2019-089013 (JP), filed on May 9, 2019.
Prior Publication US 2022/0219266 A1, Jul. 14, 2022
Int. Cl. B23K 35/368 (2006.01); B23K 35/02 (2006.01); B23K 35/30 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01)
CPC B23K 35/368 (2013.01) [B23K 35/0266 (2013.01); B23K 35/3053 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A flux-cored wire for straight polarity gas-shielded arc welding,
the flux-cored wire comprising a flux comprising a fluoride powder and a metal powder,
wherein the fluoride powder comprises BaF2 and at least one selected from the group consisting of SrF2, AlF3, and CaF2,
wherein contents of the BaF2, the SrF2, the AlF3, and the CaF2 satisfy, in terms of mass % relative to a total mass of the wire,
BaF2: 1.0% to 4.5%,
SrF2: 2.0% or less,
CaF2: 0.45% or less, and
AlF3: 0.70% or less,
wherein at least one of a metal element constituting the fluoride powder and a metal element constituting the metal powder is a strong deoxidizing metal element having at least one standard Gibbs energy of formation of −200 to −150 kcal/molO2 at 1500° C. to 1600° C. in an Ellingham diagram of an oxide of the strong deoxidizing metal element, and
wherein contents of an oxide and a carbonate in the flux satisfy, in terms of mass % relative to the total mass of the wire,
oxide: 0.5% or less, and
carbonate: 0.5% or less.