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- Title
Effects of post-weld heat treatment on mechanical properties and microstructure of resistance spot–welded lightweight steel.
- Authors
Hwang, Insung; Cho, Heewon; Nam, Sangwoo; Kang, Munjin; Koo, Min-Seo; Kim, Young-Min
- Abstract
To improve the mechanical properties of resistance spot–welded 780-MPa-grade lightweight steel, post-weld heat treatment (PWHT) through the application of a second welding current and using a furnace was performed after resistance spot welding. It was not possible to obtain satisfactory mechanical properties of the weld through the application of a second welding current. In the case of the PWHT by a furnace, the required loads were satisfied when PWHT was applied at temperatures of less than 300 °C for more than 30 min, and at more than 300 °C for 15 min or more. Due to the softening of martensite by PWHT, the resistance to fracture progression during tensile test was increased, and mechanical properties could be improved.
- Subjects
LIGHTWEIGHT steel; MECHANICAL heat treatment; SPOT welding; LIGHTWEIGHT concrete; HEAT treatment; MICROSTRUCTURE
- Publication
International Journal of Advanced Manufacturing Technology, 2019, Vol 104, Issue 9-12, p4813
- ISSN
0268-3768
- Publication type
Article
- DOI
10.1007/s00170-019-04366-x