# US 2014/0197139 A1 · Production of fine grains in deposition welding

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- Number: US 2014/0197139 A1
- Document ID: US20140197139A1
- Status: Published application
- Kind: A1
- Application number: 14/152,327
- Filed: 2014-01-10
- Published: 2014-07-17
- Earliest claimed: 2013-01-11
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Bernd BURBAUM; Torsten JOKISCH
- Web page: https://patentgrep.com/patent/US20140197139A1

## CPC

- B23K 26/342: Build-up welding
- B23K 26/34: Laser welding for purposes other than joining
- B23K 2101/001: {Turbines}
- 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

By tilting a welding nozzle back and forth for depositing each successively applied weld layer, a very fine-grained structure is achieved in the multilayered buildup of material producing a directionally solidified structure.

## Claims

### Claim 1

A method for deposition welding of a substrate, which has a directionally solidified structure, the method comprising,
holding a welding nozzle at a selected angle (α1, α2) relative to a perpendicular to a surface of the substrate wherein the selected angle differs significantly from 0° and
producing a first weld layer at a first tilt angle (α1) in relation to the perpendicular to the surface that is different from 0° and
then producing a second weld layer at a second tilt angle (α2) in relation to the perpendicular to the surface that is significantly different from 0° and significantly different from the first angle (α1).

### Claim 2 (depends on 1)

The method as claimed in claim 1, in which the directionally solidified structure has a columnar-solidified structure.

### Claim 3 (depends on 1)

The method as claimed in claim 1, in which the directionally solidified structure has a monocrystalline structure.

### Claim 4 (depends on 1)

The method as claimed in claim 1, using a laser deposition welding.

### Claim 5 (depends on 1)

The method as claimed in claim 1, further comprising the first angle (α1) with respect to the perpendicular to the surface is 30°+/−5°.

### Claim 6 (depends on 5)

The method as claimed in claim 5, further comprising the second weld layer is welded at the second angle (α2) which is (360°−α1) with respect to the perpendicular to the surface of the preceding weld layer (13′, 13″, . . . ).

### Claim 7 (depends on 1)

The method as claimed in claim 1, further comprising tilting the welding nozzle in repeated alternation about the perpendicular to the surface, alternating between the first and second angles.

### Claim 8 (depends on 1)

The method as claimed in claim 1, in which a polycrystalline welding point is produced.

### Claim 9 (depends on 7)

The method as claimed in claim 7, wherein all first angles are the same angles and all second angles are the same angles.