The degree to which these properties are affected depends on the chemical composition of the base material and the cooling rate after welding. This elevated temperature causes microstructural changes to the base material which can change very important material properties such as tensile strength, hardness, ductility and toughness. When we weld, we introduce enough heat to melt the base material. In steel fabrication, the most common PWHT procedures applied are post heating and stress relieving. But what is PHWT? When is PWHT required? What temperature should PWHT be done at? Heat treating of materials can be a very complicated subject, but when it comes to heat treatment after welding it boils down to a simple concept: PWHT is done in order to maintain or improve material strength and mechanical properties and to relieve residual stresses. If you are involved in welding you have definitely heard this term. Have you heard of post weld heat treatment (PWHT)? Of course you have.
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