# US 2013/0240488 A1 · Flux-cored wire and gas-shielded arc welding method using the same

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- Number: US 2013/0240488 A1
- Document ID: US20130240488A1
- Status: Published application
- Kind: A1
- Application number: 13/772,599
- Filed: 2013-02-21
- Published: 2013-09-19
- Earliest claimed: 2012-03-13
- Assignees: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
- Inventors: Minoru MIYATA; Reiichi Suzuki; Shun Izutani
- Web page: https://patentgrep.com/patent/US20130240488A1

## CPC

- B23K 9/173: and of a consumable electrode
- B23K 35/0266: {flux-cored}
- B23K 35/308: {with Cr as next major constituent}
- B23K 35/3086: {containing Ni or Mn}
- B23K 35/383: {mainly containing noble gases or nitrogen}
- C22C 38/26: with niobium or tantalum
- C22C 38/28: with titanium or zirconium
- C22C 38/38: with more than 1.5% by weight of manganese
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

There is provided a flux-cored wire containing flux within a stainless steel or mild steel outer cover for use in stainless steel welding and gas-shielded arc welding using a shielding gas. The flux-cored wire contains, based on the total mass of the flux-cored wire, predetermined amounts of C, Si, Mn, P, S, Cr, Ti, and O. The remainder are Fe and incidental impurities. The shielding gas is pure Ar gas.

## Claims

### Claim 1

A flux-cored wire containing flux within a stainless steel or mild steel outer cover for use in stainless steel welding and gas-shielded arc welding using a shielding gas,
the flux-cored wire comprising: based on the total mass of the flux-cored wire,
C: 0.10% by mass or less,
Si: 1.50% by mass or less,
Mn: 2.00% by mass or less,
P: 0.050% by mass or less,
S: 0.050% by mass or less,
Cr: 15.0% to 25.0% by mass,
Ti: 0.16% to 1.00% by mass, and
O: 0.300% by mass or less,
the remainder being Fe and incidental impurities,
wherein the shielding gas is pure Ar gas.

### Claim 2 (depends on 1)

The flux-cored wire according to claim 1, further comprising: based on the total mass of the flux-cored wire, at least one of
Al: 1.00% by mass or less,
N: 0.05% by mass or less,
Nb: 0.10% to 1.00% by mass, and
Mo: 3.00% by mass or less.

### Claim 3 (depends on 1)

The flux-cored wire according to claim 1, wherein the Cr and Ti contents are
Cr: 15.0% to 19.0% by mass, and
Ti: 0.16% to 0.50% by mass,
the flux-cored wire further comprising:
based on the total mass of the flux-cored wire, at least one of
Al: 1.00% by mass or less,
N: 0.05% by mass or less,
Nb: 0.10% to 1.00% by mass, and
Mo: 3.00% by mass or less.

### Claim 4 (depends on 1, 2, 3)

The flux-cored wire according to any one of claims 1 to 3, wherein the flux filling factor is in the range of 5% to 30% by mass based on the total mass of the flux-cored wire.

### Claim 5 (depends on 2, 3)

The flux-cored wire according to claim 2 or 3, wherein the Nb content is Nb: 0.30% to 1.00% by mass.

### Claim 6 (depends on 1)

A gas-shielded arc welding method, comprising: feeding the flux-cored wire according to claim 1 into a shielding gas of pure Ar; and passing a pulsed electric current as a welding current through the flux-cored wire to generate an arc between the flux-cored wire and a base stainless steel to perform welding.