# US 6,723,945 B2 · Welding device with a field former

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- Number: US 6,723,945 B2
- Document ID: US6723945B2
- Status: Granted
- Kind: B2
- Application number: 10/277,007
- Filed: 2002-10-21
- Published: 2003-08-07
- Granted: 2004-04-20
- Earliest claimed: 2000-03-22
- Assignees: Newfrey LLC
- Inventors: Roland Kurz
- Web page: https://patentgrep.com/patent/US6723945B2

## CPC

- B23K 9/08: Arrangements or circuits for magnetic control of the arc
- B23K 9/067: Starting the arc
- B23K 9/0671: {by means of brief contacts between the electrodes}
- B23K 11/04: Flash butt welding
- 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

A welding device includes a holder for a weld part (1) adapted to be moved substantially perpendicularly to, and away from, a surface of a workpiece (2) on which the weld part (1) is to be welded. An arc producing system produces an arc between the weld part (1) and the surface of the workpiece (2) with the arc generating a magnetic flux. A field former (3) includes a low-retentivity steel and provides a flux path for the magnetic flux generated by the arc.

## Claims

### Claim 1

A welding device with a holder for a weld part (1) adapted to be moved substantially perpendicularly to a surface of a workpiece (2) and away from it, on which the weld part (1) is to be welded, an arc producing system for producing an arc between the weld part (1) and the surface of the workpiece (2) with the arc generating a magnetic flux, a field former (3,8,9), characterized in that the field former (3,8,9) includes a low-retentivity steel and provides a flux path for the magnetic flux generated by the arc.

### Claim 2

A welding device with a holder for a weld part (1) adapted to be moved substantially perpendicularly to and away from a surface of a workpiece (2) on which the weld part (1) is to be welded, an arc producing system for producing an arc between the weld part (1) and the surface of the workpiece (2) with the arc generating a magnetic flux, a field former (3,8,9) characterized in that the field former (3,8,9) includes at least one straight portion and provides a flux path for the magnetic flux generated by the arc.

### Claim 3 (depends on 1)

The welding device according to claim 1, characterized in that the field former (3) essentially has a polygonal cross section, and is U-shaped in design.

### Claim 4 (depends on 3)

The welding device according to claim 3, characterized in that two U-shaped field formers (3) are provided which are spaced with free arms (4,5) directed toward one another.

### Claim 5 (depends on 1)

The welding according to claim 1, characterized in that the field former (0,9) is rod-shaped in design.

### Claim 6 (depends on 5)

The welding device according to claim 5, characterized in that two field formers (8,9) are provided which extend substantially parallel to one another.

### Claim 7 (depends on 1)

The welding device according to claim 1, characterized in that the field former (3,8,9) is connected to a nose-piece (7).

### Claim 8 (depends on 2)

The welding device according to claim 2, characterized in that the field former (3) essentially has a polygonal cross section, and is U-shaped in design.

### Claim 9 (depends on 8)

The welding device according to claim 8, characterized in that two U-shaped field formers (3) are provided which are spaced with free arms (4,5) directed toward one another.

### Claim 10 (depends on 2)

The welding according to claim 2 characterized in that the field former (8,9) is rod-shaped in design.

### Claim 11 (depends on 10)

The welding device according to claim 10, characterized in that two field formers (8,9) are provided which extend substantially parallel to one another.

### Claim 12 (depends on 2)

The welding device according to claim 2, characterized in that the field former (3,8,9) is connected to a nose-piece (7).