Flux for submerged arc welding

Patent metadata

Field	Value
Publication number	US-2016175993-A1
Application number	US-201414909905-A
Country	US
Kind code	A1
Filing date	May 27, 2014
Priority date	Aug 5, 2013
Publication date	Jun 23, 2016
Grant date	—

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 in the use of either an AC or a DC welding power source. The flux for submerged arc welding includes Al 2 O 3 : 15 to 35% by mass; SiO 2 : 10 to 30% by mass; MgO: 10 to 25% by mass; F (in terms of CaF 2 ): 10 to 25% by mass; Mn (in terms of MnO): to 20% by mass; Na (in terms of Na 2 O) and/or K (in terms of K 2 O): 0.5 to 4.5% by mass in total; and Fe (in terms of FeO): 0.5 to 8% by mass, in which a CaO content is restricted to 6% by mass or less, a water-soluble SiO 2 is restricted to less than 1% by mass, and the flux has a composition that satisfies the following formula (I):
0.2≦[MgO]/([Al 2 O 3 ]+[MnO])≦0.8  (I).

First claim

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

2 . The flux for submerged arc welding according to claim 1 , further comprising: TiO 2 : 8% by mass or less,
wherein the flux satisfies the following 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 for submerged arc welding according to claim 1 , wherein a C content is 0.2% by mass or less.

4 . The flux for submerged arc welding according to claim 2 , wherein a C content is 0.2% by mass or less.

5 . The flux for submerged arc welding according to claim 1 , wherein the flux is sintered at a temperature of 800° C. or higher.

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

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

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

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

10 . A weld made by the method according to claim 9 .

11 . 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 (in terms of CaF 2 ): 10 to 25% by mass; Mn (in terms of MnO): 3 to 20% by mass; Na (in terms of Na 2 O) and/or K (in terms of K 2 O): 0.5 to 4.5% by mass in total; and Fe (in terms of FeO): 0.5 to 8% by mass, wherein a CaO content is restricted to 6% by mass or less, a water-soluble SiO 2 content is restricted to less than 1% by mass, and the flux satisfies the following 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 (in terms of MnO).

12 . The composition of claim 11 that is a submerged arc welding flux.

Assignees

• Kobe Steel Ltd

Inventors

• Kano Satoru
• Ota Makoto

Classifications

• B23K35/3602

  Carbonates, basic oxides or hydroxides · CPC title

• B23K9/186

  making use of a consumable electrodes · CPC title

• B23K35/3607

  Silica or silicates · CPC title

• B23K35/0244

  Powders, particles or spheres; Preforms made therefrom · CPC title

• B23K35/3605

  Fluorides · CPC title