Flux for electroslag welding and electroslag welding method

Patent metadata

Field	Value
Publication number	US-12558745-B2
Application number	US-202117905389-A
Country	US
Kind code	B2
Filing date	Feb 24, 2021
Priority date	Mar 6, 2020
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A flux for electroslag welding used for electroslag welding may include a basic oxide, an amphoteric oxide, an acidic oxide, and a fluoride. With respect to a total mass of the flux, the basic oxide may include 5.1 mass % or more and 30.0 mass % or less of CaO, the acidic oxide includes 17 mass % or less of SiO 2 , and the fluoride includes 35 mass % or more and 73 mass % or less of CaF2. A content of the CaO is 30 mass % or more with respect to a total mass of the basic oxide, a content of the SiO 2 is 80 mass % or more with respect to a total mass of the acidic oxide, a content of the CaF 2 is 80 mass % or more with respect to a total mass of the fluoride, and a value of (2×[CaF 2 ]+[CaO])/[SiO 2 ] is 5 or more and 56 or less.

First claim

The invention claimed is:

1 . A flux suitable for electroslag welding used for electroslag welding, the flux comprising:
a basic oxide; an amphoteric oxide; an acidic oxide; a fluoride; and at least one selected from the group consisting of BaO, FeO, MgO, MoO 3 , V 2 O 5 , P 2 O 5 , ZrO 2 , TiO 2 , and B 2 O 3 , wherein the basic oxide comprises CaO in a range of from 5.1 to 30.0 mass % with respect to a total flux mass, the CaO being present in 30 mass % or more with respect to a total basic oxide mass, wherein the acidic oxide comprises SiO 2 in a range of 17 mass % or less with respect to the total flux mass, the SiO 2 being present in a range of 80 mass % or more with respect to a total acidic oxide mass, wherein the fluoride comprises CaF 2 in a range of from 35 to 73 mass % with respect to the total flux mass, the CaF 2 being present in 80 mass % or more with respect to a total fluoride mass, and wherein a value calculated by relation (1) is in a range of from 5 to 56:
(2×[CaF 2 ]+[CaO])/[SiO 2 ]  (1),

wherein [CaO] is a content of the CaO, [SiO 2 ] is a content of the SiO 2 , and [CaF 2 ] is a content of the CaF 2 , each by mass % with respect to the total flux mass.

2 . The flux of claim 1 , comprising, with respect to the total flux mass:
the basic oxide in a range of from 10 to 40 mass %; the amphoteric oxide in a range of from 5 to 35 mass %; the acidic oxide in a range of 17 mass % or less, wherein a total content of all oxides, being a total of the basic oxide, the amphoteric oxide, and the acidic oxide, is in a range of from 28 to 60 mass %, and wherein a value calculated by relation (2) is in a range of from 0.5 to 2.7:
[Fld]/[Ox]  (2)

wherein [Fld] is a total content of the fluoride and [Ox] is a total content of the all oxide, each by mass % with respect to the total flux mass.

3 . The flux of claim 2 , wherein, with respect to the total flux mass, the basic oxide comprises:
BaO in a range of 11 mass % or less, FeO in a range of 5 mass % or less, MgO in a range of 5 mass % or less, a total content of either one or both of MnO and MnO 2 (MnO conversion value) in a range of 5 mass % or less, K 2 O in a range of 5 mass % or less, Na 2 O in a range of 5 mass % or less, and/or Li 2 O in a range of 5 mass % or less, and wherein, with respect to the total flux mass, the amphoteric oxide comprises Al 2 O 3 in a range of 35 mass % or less, ZrO 2 in a range of 5 mass % or less, and/or TiO 2 in a range of 5 mass % or less.

4 . The flux of claim 3 , wherein a value calculated by relation (3) is 0.35 or less:
([CaO]+[BaO])/([CaF 2 ]+[Al 2 O 3 ])  (3),
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

5 . The flux of claim 4 , wherein a value calculated by relation (4) is 0.38 or more:
([CaO]+[Al 2 O 3 ]+[BaO])/[CaF 2 ]  (4),
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

6 . The flux of claim 3 , wherein a value calculated by relation (4) is 0.38 or more:
([CaO]+[Al 2 O 3 ]+[BaO])/[CaF 2 ]  (4),
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

7 . The flux of claim 2 , wherein, with respect to the total flux mass, the acidic oxide comprises:
MoO 3 in a range of 5 mass % or less, V 2 O 5 in a range of 5 mass % or less, and/or P 2 O 5 in a range of 5 mass % or less.

8 . The flux of claim 2 , wherein, with respect to the total flux mass, the amphoteric oxide comprises:
B 2 O 3 in a range of 2 mass % or less (including 0 mass %).

9 . An electroslag welding method, comprising:
welding using a welding wire and the flux of claim 2 .

10 . The flux of claim 1 , wherein, with respect to the total flux mass, the basic oxide comprises:
BaO in a range of 11 mass % or less, FeO in a range of 5 mass % or less, MgO in a range of 5 mass % or less, a total content of either one or both of MnO and MnO 2 (MnO conversion value) in a range of 5 mass % or less, K 2 O in a range of 5 mass % or less, Na 2 O in a range of 5 mass % or less, and/or Li 2 O in a range of 5 mass % or less, and wherein, with respect to the total flux mass, the amphoteric oxide comprises Al 2 O 3 in a range of 35 mass % or less, ZrO 2 in a range of 5 mass % or less, and/or TiO 2 in a range of 5 mass % or less.

11 . The flux of claim 10 , wherein a value calculated by relation (3) is 0.35 or less:
([CaO]+[BaO])/([CaF 2 ]+[Al 2 O 3 ])  (3),
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

12 . The flux of claim 11 , wherein a value calculated by relation (4) is 0.38 or more:
([CaO]+[Al 2 O 3 ]+[BaO])/[CaF 2 ]  (4),
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

13 . The flux of claim 10 , wherein a value calculated by relation (4) is 0.38 or more:
([CaO]+[Al 2 O 3 ]+[BaO])/[CaF 2 ]  (4)
wherein [CaO] is a content of the CaO, [BaO] is a content of the BaO, [CaF 2 ] is a content of the CaF 2 , and [Al 2 O 3 ] is a content of the Al 2 O 3 , with respect to the total flux mass.

14 . The flux of claim 1 , wherein, with respect to the total flux mass, the acidic oxide comprises:
MoO 3 in a range of 5 mass % or less, V 2 O 5 in a range of 5 mass % or less, and/or P 2 O 5 in a range of 5 mass % or less.

15 . The flux of claim 1 , wherein, with respect to the total flux mass, the amphoteric oxide comprises:
B 2 O 3 in a range of 2 mass % or less (including 0 mass %).

16 . An electroslag welding method, comprising:
welding using a welding wire and the flux of claim 1 .

17 . The flux of claim 1 , wherein, with respect to the total flux mass, the basic oxide comprises BaO in a range of 11 mass % or less.

18 . The flux of claim 1 , wherein, with respect to the total flux mass, the basic oxide comprises FeO in a range of 5 mass % or less.

Assignees

• Kobe Steel Ltd

Inventors

• Ishizaki Keito
• Kitagawa Yoshihiko
• Sugimura Tomoko
• Sasaki Tatsuya
• Nako Hidenori

Classifications

• B23K35/30

  with the principal constituent melting at less than 1550°C · CPC title

• B23K25/00

  Slag welding, i.e. using a heated layer or mass of powder, slag or the like in contact with the material to be joined · CPC title

• B23K35/3605

  Fluorides · CPC title

• B23K35/3602

  Carbonates, basic oxides or hydroxides · CPC title

• B23K35/362 Primary

  Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) · CPC title