# US 2014/0197143 A1 · Movement method for re-melting cracks

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- Number: US 2014/0197143 A1
- Document ID: US20140197143A1
- Status: Published application
- Kind: A1
- Application number: 14/150,274
- Filed: 2014-01-08
- 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/US20140197143A1

## CPC

- B23K 26/354: by melting
- B23K 26/24: Seam welding
- B23K 26/34: Laser welding for purposes other than joining
- B23P 6/04: Repairing fractures or cracked metal parts or products, e.g. castings
- B23P 6/045: {of turbine components, e.g. moving or stationary blades, rotors, etc.}
- F01D 5/005: {Repairing methods or devices}
- F05D 2230/232: by 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
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

Re-melting the material of a component transversely to the propagation direction of a crack in the component, providing a welding beam on the component and moving the welding beam at least transversely over the crack for re-melting the material, and more material is re-melted and increasing the strength of the re-melted crack.

## Claims

### Claim 1

A method for re-melting at least one crack in a re-meltable metal component by means of a welding beam, wherein the crack has a longitudinal direction of propagation;
at least locally over the component re-meltable metal, the method comprising moving the welding beam transversely to a direction of propagation of the at least one crack in the component.

### Claim 2 (depends on 1)

The method as claimed in claim 1, further comprising: moving the welding beam over the component, both parallel to and transversely to the direction of propagation of the crack.

### Claim 3 (depends on 1)

The method as claimed in claim 1, moving the welding beam only transversely to or only perpendicular to the direction of propagation of the crack or a plurality of the cracks.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein the welding beam begins welding from one side of the crack and produces welds at locations along the direction of propagation of the crack.

### Claim 5 (depends on 3)

The method as claimed in claim 3, further comprising, at the end of the complete re-welding of the crack, moving the welding beam back to a starting point of the welding.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein there are a plurality of the cracks running close to one another in the re-meltable metal, and the re-melting of the plurality of the cracks is performed in one continuous process.

### Claim 7 (depends on 1)

The method as claimed in claim 1, wherein the melting uses a laser beam applied to the crack.

### Claim 8 (depends on 1)

The method as claimed in claim 1, wherein no material is deposited on a surface of the component at the crack for the step of welding.

### Claim 9 (depends on 1)

The method as claimed in claim 1, wherein the component has a polycrystalline substrate.

### Claim 10 (depends on 2)

The method according to claim 2, further comprising moving the welding beam in a meandering manner over the crack and in the direction of propagation of the crack when not passing over the crack.

### Claim 11 (depends on 5)

The method according to claim 5, further comprising moving the welding beam back to a starting point of the welding and at a distance from the crack and generally in a direction of propagation of the crack.

### Claim 12 (depends on 1)

The method of claim 1, wherein the welding beam is operated so that during and/or after moving the beam across the crack, the beam does not cause re-melting of a weld or melting of the component.

### Claim 13 (depends on 12)

The method of claim 12, wherein to prevent re-melting, as the welding beam crosses the crack, the welding beam is switched off.

### Claim 14 (depends on 12)

The method of claim 12, wherein to prevent re-melting, as the welding beam crosses the crack, the welding beam is moved over the component such that the beam does not re-melt the component.

### Claim 15 (depends on 14)

The method of claim 14, wherein the moving of the beam is displacement thereof generally along the direction of propagation at the crack, and spaced away from the crack.