1. PWHT & PFHT requirement / Cycle. 2. Difference between Stress relieving & Normalising. 3. U stamp nameplate description 4. UG- 44b significance 5. Rate of Heating/Cooling formula during heat treatment cycle. 6. Impact test requirements 7. Properties of SS 304/316 8. Requirement of HIC & NACE MR0103/MR0175.

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The interview questions cover topics related to heat treatment, material properties, and industry standards in engineering.

PWHT (Post Weld Heat Treatment) and PFHT (Preheat and Post Weld Heat Treatment) are required for certain materials to relieve residual stresses and improve mechanical properties.
Stress relieving involves heating the material to a specific temperature and holding it for a period of time to reduce internal stresses, while normalizing involves heating the material above its critical temperature and then cooling it in still air.
The U stamp nameplate on pressure vessels indicates that the vessel meets the ASME Boiler and Pressure Vessel Code standards.
UG-44b in ASME Section VIII Division 1 specifies the requirements for nozzles in pressure vessels.
The rate of heating/cooling during heat treatment can be calculated using specific formulas based on the material and desired properties.
Impact tests are conducted to assess the toughness and resistance of materials to sudden loading.
SS 304 is an austenitic stainless steel with good corrosion resistance, while SS 316 is a higher grade with added molybdenum for improved resistance to corrosion.
HIC (Hydrogen Induced Cracking) and NACE MR0103/MR0175 are standards for materials used in sour service environments to prevent corrosion and cracking.

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