Post Weld Heat Treatment

 

Welding is a vital process for building and maintaining equipment in the oil and gas, petrochemical, nuclear, and aerospace industries. However, the welding process can inadvertently cause brittle fracture within weld joints due to residual stresses in the metal material. To prevent this, post weld heat treatment (pwht) is regularly performed.

PWHT involves heating the welded materials to specific temperatures and controlling the cooling rate. The purpose of this is to reduce and redistribute the residual stresses, normalize the microstructure of the metal, and improve toughness and ductility to allow for safe operation. PWHT can be achieved through a number of methods such as annealing, aging, normalizing, and quenching.

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The need for pwht can be determined by the chemical makeup of the welded material, its thickness, and its expected service conditions. Industry codes like the ASME pressure vessel and piping codes often require PWHT in certain situations, especially when the metal is susceptible to stress corrosion cracking.

Wisconsin Oven offers a full line of durable, industrial pwht furnaces that are used to heat and cool the weld materials during and after the welding process. Our pwht furnaces are manufactured with double-wall construction and patented high-efficiency design to provide the highest performance at the lowest energy consumption. They can reach temperatures up to 1400@F (538@C), making them ideal for a variety of applications including annealing, aging, normalizing, stress relief, and tempering. Our pwht furnaces can also be shipped to you ready-to-use and factory adjusted, saving you the time and cost of on-site installation and start-up.

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Spread the love  Welding is a vital process for building and maintaining equipment in the oil and gas, petrochemical, nuclear, and aerospace industries. However, the welding process can inadvertently cause brittle fracture within weld joints due to residual stresses in the metal material. To prevent this, post weld heat treatment (pwht) is regularly performed. PWHT…