US 12,296,411 B2
Flux-cored wire and welding method
Keito Ishizaki, Fujisawa (JP); Takashi Yashima, Fujisawa (JP); and Shun Izutani, Fujisawa (JP)
Assigned to Kobe Steel, Ltd., Kobe (JP)
Appl. No. 17/620,211
Filed by Kobe Steel, Ltd., Kobe (JP)
PCT Filed Jun. 9, 2020, PCT No. PCT/JP2020/022756
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2020/255808, PCT Pub. Date Dec. 24, 2020.
Claims priority of application No. 2019-114818 (JP), filed on Jun. 20, 2019.
Prior Publication US 2022/0362892 A1, Nov. 17, 2022
Int. Cl. B23K 35/368 (2006.01); B23K 9/173 (2006.01); B23K 35/02 (2006.01); B23K 35/30 (2006.01); B23K 35/36 (2006.01); B23K 35/38 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/58 (2006.01)
CPC B23K 35/368 (2013.01) [B23K 9/173 (2013.01); B23K 35/0266 (2013.01); B23K 35/3086 (2013.01); B23K 35/3605 (2013.01); B23K 35/383 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01)] 12 Claims
 
1. A flux-cored wire comprising a flux and a hoop, the flux forming a core, the hoop forming a sheath, wherein:
the flux comprises strong deoxidizing metal elements(flux) and at least one fluoride powder, and the strong deoxidizing metal elements(flux) include Mg and Al,
a total content of the strong deoxidizing metal elements(flux) is 15 to 35 mass % relative to a total mass of the flux,
at least a portion of the Mg and the Al of the strong deoxidizing metal elements(flux) is present as a strong deoxidizing metal powder, and the strong deoxidizing metal powder is at least one of a metal powder or an alloy powder,
60 mass % or more of the strong deoxidizing metal powder has a particle size of less than or equal to 150 μm,
a total content of the at least one fluoride powder is 10 to 45 mass % relative to the total mass of the flux,
60 mass % or more of the at least one fluoride powder has a particle size of less than or equal to 75 μm,
the flux is present in an amount of 10 to 30 mass %, relative to a total mass of the flux-cored wire, and
the flux-cored wire comprises, relative to the total mass of the flux-cored wire:
C: 0.5 mass % or less;
Si: 0.05 to 1.0 mass %;
Al: 1.0 to 3.5 mass %;
Mn: 1.0 to 3.0 mass %;
Mg: 0.3 to 0.9 mass %;
a total of at least one fluoride, in an amount F calculated in terms of fluorine: 0.30 to 1.20 mass %; and
a total of strong deoxidizing metal elements(wire): 2.2 mass % or greater.