Method and device for welding workpieces made of high-temperature resistant super alloys

Patent metadata

Field	Value
Publication number	US-9347318-B2
Application number	US-99489908-A
Country	US
Kind code	B2
Filing date	Nov 25, 2008
Priority date	May 29, 2008
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A method of welding workpieces of high-temperature superalloys is provided. Welding filler is applied in a plurality of layers to a surface of the workpiece via a heat input zone and a supply zone for supplying the welding filler into the heat input zone. The heat input zone and the supply zone on the one hand and the workpiece surface on the other hand are moved in relation to one another. A polycrystalline weld seam is generated by remelting a previously applied layer of the plurality of layers. Welding parameters are chosen such that a cooling rate during a solidifying of the material is at least 8000 Kelvins per second. Further, a welding apparatus for carrying out such a method is provided.

First claim

The invention claimed is:

1. A method of multi-layer welding of a workpiece of high-temperature superalloys, comprising:
applying a welding filler in a plurality of layers to a surface of a workpiece via a heat input zone and a supply zone for supplying the welding filler into the heat input zone; and
moving the heat input zone and the supply zone and the surface of the workpiece in relation to one another,
successively applying, melting, and resolidifying a first layer and a second layer of the welding filler to the surface of the workpiece such that a build-up welding on the surface of the workpiece is formed,
wherein, upon melting of the second layer, a portion of the first layer is remelted such that a polycrystalline structure is generated having irregularly distributed dendritic orientations at least within the portion of the first layer, and
wherein welding parameters are chosen such that a cooling rate during the resolidifying of the first and second layers is at least 8000 Kelvins per second,
wherein the first layer is remelted in less than a half of a layer thickness.

2. The method as claimed in claim 1 , wherein the welding parameters with respect to a welding power and a diameter of the heat input zone are chosen such that the cooling rate during the resolidifying of first and second layers is at least 8000 Kelvins per second.

3. The method as claimed in claim 1 , wherein a process speed is 250 mm per minute.

4. The method as claimed in claim 1 , wherein the heat input zone and the supply zone are moved in relation to the surface of the workpiece along a welding direction on a path oscillating around the welding direction.

5. The method as claimed in claim 1 , wherein the workpiece comprises γ′-containing nickel-based superalloy.

6. The method as claimed in claim 1 , wherein the welding filler is a γ′-forming nickel-based superalloy material.

7. The method as claimed in claim 2 , wherein for each layer, the heat input zone and the supply zone are moved in relation to the surface of the workpiece along a welding direction, and wherein welding directions of successive layers are turned with respect to one another.

8. The method as claimed in claim 3 , wherein for each layer, the heat input zone and the supply zone are moved in relation to the surface of the workpiece along a welding direction, and wherein welding directions of successive layers are turned with respect to one another.

Assignees

• Arjakine Nikolai
• Bostanjoglo Georg
• Burbaum Bernd
• Gasser Andres
• Jambor Torsten
• Linnenbrink Stefanie
• Melzer-Jokisch Torsten
• Ott Michael
• Pirch Norbert
• Wilkenhöner Rolf
• Siemens Ag
• Fraunhofer Ges Forschung

Inventors

• Arjakine Nikolai
• Bostanjoglo Georg
• Burbaum Bernd
• Gasser Andres
• Jambor Torsten
• Linnenbrink Stefanie
• Melzer-Jokisch Torsten
• Ott Michael
• Pirch Norbert
• Wilkenhöner Rolf

Classifications

• F05D2230/80

  Repairing, retrofitting or upgrading methods · CPC title

• B23K2201/001

  Operations & Transport · mapped topic

• B23K26/144

  the fluid stream containing particles, e.g. powder · CPC title

• F01D5/005 Primary

  Repairing methods or devices · CPC title

• F05D2230/232

  by welding · CPC title