# US 10,245,673 B2 · MIG/MAG welding of carbon steel with rotating arc and Ar/He/O2 gas mixture

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- Number: US 10,245,673 B2
- Document ID: US10245673B2
- Status: Granted
- Kind: B2
- Application number: 13/808,777
- Filed: 2011-07-04
- Published: 2013-05-09
- Granted: 2019-04-02
- Earliest claimed: 2010-07-07
- Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
- Applicants: Laurent Biskup; Gilles Boudet; Jean-Pierre Planckaert; Michel Saez
- Inventors: Laurent Biskup; Gilles Boudet; Jean-Pierre Planckaert; Michel Saez
- Web page: https://patentgrep.com/patent/US10245673B2

## CPC

- B23K 9/173: and of a consumable electrode
- B23K 9/0216: {Seam profiling, e.g. weaving, multilayer}
- B23K 9/028: for curved planar seams
- B23K 9/08: Arrangements or circuits for magnetic control of the arc
- B23K 35/383: {mainly containing noble gases or nitrogen}
- B23K 2101/12: Vessels
- B23K 2103/04: Steel {or steel} alloys
- B23K 2103/05: {Stainless steel}
- 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

## Abstract

The invention relates to a ternary gaseous mixture formed from argon, helium and oxygen, characterized in that it is formed from between 19.5 and 20.5% of helium, between 2.7 and 3.3% of Oi, and argon for the remainder (volume %), and to the use thereof as gaseous protection in a method of electric arc welding of at least one steel part to carbon, using a fusible filler wire. Preferably, the welded parts overlap or cover each other and the rotary arc welding takes place where the parts overlap.

## Claims

### Claim 1

A process for the electric-arc MIG/MAG welding of at least two carbon steel parts with use of a consumable filler wire, a rotating arc and gas shielding formed of a ternary gas mixture consisting of 19.5 to 20.5% of helium, of 2.7 to 3.3% of O2 and of argon for the remainder (% by volume), wherein the consumable filler wire is melted by the rotating arc so as to obtain metal transfer by rotating liquid vein and the at least two carbon steel parts overlapping or covering one another, the rotating arc welding taking place at said overlap or covering.

### Claim 2 (depends on 1)

The process of claim 1, wherein the gas shielding is formed of a ternary gas mixture containing from 19.8 to 20.2% of helium.

### Claim 3 (depends on 1)

The process of claim 1, wherein the gas shielding is formed of a ternary gas mixture containing from 2.8 to 3.2% of O2.

### Claim 4 (depends on 1)

The process of claim 1, wherein the gas shielding is formed of a ternary gas mixture containing from 2.9 to 3.1% of O2.

### Claim 5 (depends on 1)

The process of claim 1, wherein the gas shielding is formed of a ternary gas mixture consisting of 20% of helium, 3% of O2 and of argon for the remainder.

### Claim 6 (depends on 1)

The process of claim 1, wherein the welded parts are in a joggled type configuration.

### Claim 7 (depends on 1)

The process of claim 1, wherein the welded parts are constituent components of a pressure vessel of a hot water tank, extinguisher, compressor, refrigeration device or gas cylinder type.

### Claim 8 (depends on 1)

The process of claim 1, wherein the welded parts comprise cylindrical ends that overlap one another.

### Claim 9 (depends on 1)

The process of claim 1, wherein an arc voltage between 29.5 V and 35 V is used.

### Claim 10 (depends on 1)

The process of claim 1, wherein the wire has a diameter of 0.8 to 1 mm.