Flux-cored wire for gas-shielded arc welding, method for welding steel for very low temperature use, and method for manufacturing weld joint

There is provided a flux-cored wire capable of obtaining a weld metal having excellent low temperature toughness and improving welding efficiency, in which preheating performed for preventing cold cracking can be omitted or simplified. The flux-cored wire includes one or more of CaF2 , BaF2 , SrF2 ,...

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Bibliographic Details
Main Authors SARUWATARI SUO, KOJIMA KAZUHIRO, KUMAGAI TATSUYA, NAKAMURA SHUICHI
Format Patent
LanguageEnglish
Published 20.05.2015
Subjects
ALLOYS
CHEMISTRY
CLADDING OR PLATING BY SOLDERING OR WELDING
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
FERROUS OR NON-FERROUS ALLOYS
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
METALLURGY
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
TRANSPORTING
TREATMENT OF ALLOYS OR NON-FERROUS METALS
WELDING
WORKING BY LASER BEAM
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Summary:There is provided a flux-cored wire capable of obtaining a weld metal having excellent low temperature toughness and improving welding efficiency, in which preheating performed for preventing cold cracking can be omitted or simplified. The flux-cored wire includes one or more of CaF2 , BaF2 , SrF2 , MgF2 , and LiF and, when a total amount thereof is defined as alpha, the alpha is 2.0% to 7.0%, by mass%, with respect to a total mass of the flux-cored wire, one or more of a Ti oxide, a Si oxide, a Mg oxide, an A1 oxide, a Zr oxide, and a Ca oxide are included in the flux-cored wire, and when a total amount thereof is defined as beta, the beta is 0.2% to 0.9%, by mass%, with respect to the total mass of the flux-cored wire, a ratio of an amount of the CaF2 with respect to the alpha is 0.90 or more, and a ratio of the beta with respect to the is 3.0 or more and 15.0 or less.
Bibliography:Application Number: CN20141643455