Induction Flange Weld Heater and Ceramic Pad Flange Weld Heater in Many Fields

Treatment(PWHT)? What is the real benift getting from PWHT. After doing PWHT what is the chage happening in the micro structure of steel.

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Treatment(PWHT)?
What is the real benift getting from PWHT. After doing PWHT what is the chage happening in the micro structure of steel. why hardness test is conducted after pwht( is it to confirm removal of martensite -structure). pls explain whether the aim is to remove internal stresses or to change microstructure or both.
How does post welding heat treatment effect the properties of two materials (steel and another)?

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