Single crystal welding of directionally solidified materials
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SIEMENS AG
- Publication Date
- 2012-07-18
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] The invention relates to a welding method of directional crystallized metal materials. Background technique
[0002] γ’-strengthened SX nickel-based superalloys cannot be overlaid in one or more layers with the same type of additive material in overlapping welding tracks by neither conventional welding methods nor high-energy methods (laser, electron beam). The problem is that, in the case of individual welding tracks in the edge region close to the surface, an incorrectly oriented tissue has formed. For successive overlapping tracks, this means that the solidification front in this region has no SX nuclei and that the region continues to expand in the overlapping region with a wrong orientation (no SX structure). Cracks form in this area.
[0003] For γ'-strengthened SX nickel-based superalloys, the welding methods used so far do not allow the weld metal to be constructed homogeneously in one or more layers with the same SX structure in the lap weld...