Flux for submerged arc welding

Patent metadata

Field	Value
Publication number	US-10272528-B2
Application number	US-201414909905-A
Country	US
Kind code	B2
Filing date	May 27, 2014
Priority date	Aug 5, 2013
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

Provided is a flux for submerged arc welding that has good welding workability and can reduce the diffusion hydrogen content in a weld metal using either an AC or a DC welding power source. The flux includes Al2O3: 15 to 35% by mass; SiO2: 10 to 30% by mass; MgO: 10 to 25% by mass; F expressed in terms of CaF2: 10 to 25% by mass; Mn expressed in terms of MnO: 3 to 20% by mass; Na expressed in terms of Na2O and/or K expressed in terms of K2O: 0.5 to 4.5% by mass in total; Fe expressed in terms of FeO: 0.5 to 8% by mass; and CaO: 6% by mass or less. A water-soluble SiO2 in the flux is less than 1% by mass. In addition, the flux has a composition that satisfies the following formula: 0.2≤[Mg/O]/([Al2O3]+[MnO])≤0.8.

First claim

The invention claimed is:

1. A flux for submerged arc welding, the flux comprising:
Al 2 O 3 : 15 to 35% by mass;
SiO 2 : 10 to 30% by mass;
MgO: 10 to 25% by mass;
F expressed in terms of CaF 2 : 10 to 25% by mass;
Mn expressed in terms of MnO: 3 to 20% by mass;
Na expressed in terms of Na 2 O and/or K expressed in terms of K 2 O: 0.5 to 4.5% by mass in total; and
Fe expressed in terms of FeO: 0.5 to 8% by mass,
wherein
a CaO content is 6% by mass or less,
a water-soluble SiO 2 content is less than 1% by mass,
a C content is 0.05% by mass or less, and
the flux satisfies formula (I):
0.2≤[MgO]/([Al 2 O 3 ]+[MnO])≤0.8  (I)

where [Al 2 O 3 ] is an Al 2 O 3 content, [MgO] is an MgO content, and [MnO] is an Mn content expressed in terms of MnO.

2. The flux according to claim 1 , further comprising:
TiO 2 : 8% by mass or less,
wherein the flux satisfies formula (II):
0.2≤[MgO]/([Al 2 O 3 ]+[MnO]+[TiO 2 ])≤0.8  (II)

where [TiO 2 ] is a TiO 2 content.

3. The flux according to claim 1 , wherein the flux is sintered at a temperature of 800° C. or higher.

4. The flux according to claim 2 , wherein the flux is sintered at a temperature of 800° C. or higher.

5. A method for submerged arc welding, the method comprising:
welding at least one material with the flux according to claim 1 .

6. A weld, made by the method according to claim 5 .

7. A composition, comprising:
Al 2 O 3 : 15 to 35% by mass;
SiO 2 : 10 to 30% by mass;
MgO: 10 to 25% by mass;
F expressed in terms of CaF 2 : 10 to 25% by mass;
Mn expressed in terms of MnO: 3 to 20% by mass;
Na expressed in terms of Na 2 O and/or K expressed in terms of K 2 O: 0.5 to 4.5% by mass in total; and
Fe expressed in terms of FeO: 0.5 to 8% by mass,
wherein
a CaO content is 6% by mass or less,
a water-soluble SiO 2 content is less than 1% by mass,
a C content is 0.05% by mass or less, and
the composition satisfies formula (I):
0.2≤[MgO]/([Al 2 O 3 ]+[MnO])≤0.8  (I)

where [Al 2 O 3 ] is an Al 2 O 3 content, [MgO] is an MgO content, and [MnO] is an Mn content expressed in terms of MnO.

Assignees

• Kobe Steel Ltd

Inventors

• Kano Satoru
• Ota Makoto

Classifications

• B23K35/362 Primary

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

• B23K35/361

  Alumina or aluminates · CPC title

• B23K35/3608

  Titania or titanates · CPC title

• B23K35/3607

  Silica or silicates · CPC title

• B23K35/3605

  Fluorides · CPC title