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Heat Treatment (Furnace / Local)

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Heat Treatment (Furnace / Local)


Post Weld Heat Treatment Services (PWHT) is defined as one of heat treatments done after welding/machining to improve the Chemical mechanical properties of weldment / machined surfaces. In concept, PWHT covers many different potential treatments. However, in steel fabrication, the most common procedure used is Stress Relieving.

OUR SERVICE INCLUDE:

  • Preheat and Stress Relieving (PWHT)
  • Resistance Bolt Heating
  • Refractory Curing / Dry-outs
  • Thermal Expansions
  • PWHT by Furnace method ( electric / Oil Fire)

INDUSTRIES THAT WE SUPPORT INCLUDE:

  • Power Generation Facilities
  • Petroleum Producers
  • Petrochemical Facilities onshore / offshore
  • Fabrication Facilities
  • Gas Plants & Pipe lines
  • Renewable wind turbines onshore / offshore

HOW IS STRESS RELIEVING DONE?

Stress Relieving is done by uniformly heating- fabricated equipment or the vessel or vessel part to a sufficiently high temperature, but below the lower transformation temperature range, then subjecting it to a thermal retardation for a sufficient time depending upon the material thickness and then finally uniformly cooling it which is also of utmost importance.

ADVANTAGES OF POST WELD HEAT TREATMENT - STRESS RELIEVING :

  • A much greater dimensional stability is obtained and maintained
  • The potential of stress induce cracking is reduced.
  • Metallurgical structure is improved.
  • Strength of the Material and Life of the equipment is Enhanced.

ADVANTAGE OF REFRACTORY DRY OUTS

  • Improves refractory strength
  • Eliminates refractory separation
  • Removes mechanical water
  • Avoid thermal stress