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POST WELD HEAT TREATMENT (PWHT) HIGH VOLTAGE
Post-weld heat treatment or PWHT is a controlled process that involves reheating the metal below its lower critical transformation temperature, following a welding process.The material is then held at the elevated temperature for a predetermined period of time to alleviate residual stresses, increase the strength, increase or decrease the hardness, and reduce the risk of cracking by microstructural changes.
An array of heating processes can be used to carry out post-weld heat treatment.
Advantages of POST WELD HEAT TREATMENT (PWHT)
- Improved metallurgical structure
- Improved ductility of the material
- Reduced risk of brittle fracture as ductility increases
- Relaxed thermal stress due to the redistribution of residual stresses.