Title:
WELDING FLUX AND PRODUCTION METHOD THEREFOR, AND SUBMERGED ARC WELDING METHOD USING SAME WELDING FLUX
Document Type and Number:
WIPO Patent Application WO/2022/030159
Kind Code:
A1
Abstract:
Provided is a welding flux allowing excellent moisture absorption resistance to be obtained even when left standing for a long period of time, thereby allowing for a reduction in the amount of diffusing hydrogen in the welded metal, which is one factor causing welded metal cracking; also provided are a production method for the welding flux, and a submerged arc welding method using the welding flux. The welding flux comprises particles (1) containing an oxide. The oxide contains Si. A compound layer (2) has been formed over at least a portion of the outer surface on each of the particles (1). The compound layer (2) contains a strong deoxidizing element constituting an oxide having a lower standard Gibbs energy of formation than the standard Gibbs energy of formation of SiO2 in a temperature range of 500 to 1,000°C in an Ellingham diagram. The particles (1) having the compound layer formed over 50% or more of the outer surface are present at a proportion of 50% or higher with respect to the total particle count for the particles containing the oxide.
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Inventors:
HATOMOTO DAISUKE
SATO MUNENOBU
SATO MUNENOBU
Application Number:
PCT/JP2021/025376
Publication Date:
February 10, 2022
Filing Date:
July 05, 2021
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
B23K35/362
Domestic Patent References:
| WO2018182025A1 | 2018-10-04 |
Foreign References:
| JP2003039196A | 2003-02-12 | |||
| JPH11239893A | 1999-09-07 | |||
| JPH0999392A | 1997-04-15 | |||
| JPH0237833B2 | 1990-08-27 | |||
| JPS62130793A | 1987-06-13 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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