Heat Treating is the controlled heating and cooling of metals to alter their physical and mechanical properties without changing the product shape. It is often associated with increasing the strength of material, but it can also be used to alter certain manufacturability objectives such as improve machining, improve formability, or restore ductility after a cold working operation. It not only can help other manufacturing processes but can also improve product performance by increasing strength or other desirable characteristics.

Heat treatment is required for piping, structured steel work, pressure vessels, bullet and spherical tanks on refineries, power station, petrochemical plants, oil rigs, shipyards both onshore and offshore and other fabrication works during construction, on maintenance or shutdown period.

Heat treatment can be applied to Carbon Steel, Low and High Alloyed Steel, Cast Iron Steel, etc. applicable by the international code.

Post-weld heat treatment (PWHT)

Post-weld heat treatment (PWHT) is a process that involves elevating the temperature of a material following a welding process. The post-weld heat treatment is performed to alleviate residual stresses, increase the strength, increase, or decrease the hardness, and reduce the risk of cracking.

Pre-weld heat treatment (PWHT)

Preheating in welding is used to help ensure weld quality and reduce the occurrence of cracking and other problems that can result in costly rework. Welding preheat is commonly used before welding steel or steel alloy pipes or plates. It reduces the cooling rate of the weld and drives out moisture, which in turn helps prevent hydrogen build-up and the potential for cracking.


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