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US 11,441,039 B2Granted
High temperature coatings to mitigate weld cracking in resistance welding
AssigneeGM Global Technology Operations LLC
InventorsZhenke Teng, Jason M. Brown, Thomas R. Jones, Pei-chung Wang, Michael J. Karagoulis
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Abstract
A high temperature substrate coating to mitigate liquid metal embrittlement (LME) cracking in automobile vehicles includes a substrate. A coating is disposed on the substrate, the coating being one of a zinc-based material and an aluminum-based material, with the coating having a melting point of at least 500° C.
Claims8
A method for application of a high temperature coating to mitigate liquid metal embrittlement (LME) cracking in automobile vehicles, comprising:
- applying a corrosion resistant material coating onto a substrate;
- identifying three factors occurring in unison when a liquid metal embrittlement (LME) cracking event is found, the LME cracking event occurring when a first factor defining a liquid metal phase of the corrosion resistant material coating applied to the substrate is present simultaneously with a second factor defining an occurrence of a threshold tensile strain in the substrate and a third factor defining a threshold microstructure sensitive to LME cracking;
- and
- modifying the first factor by selecting the corrosion resistant material as an Al-10Zn-10Mg material having a melting point greater than approximately 500° C. to mitigate occurrence of the LME cracking event in the substrate.
1 more element
Dependencies are inferred from the claim text.