PWHT is primarily to relieve the residual stresses developed during welding. In PWHT, the weld and adjacent region are heated to below transformation range, holding for predetermined period and then cooled, where as in stress relief (SR) the entire structure / assembly is heated in a furnace to...
I have seen somewhere ASTM specifies about washer requirement in-between bolt and nut in a flange connection.
Can someone help me to identify which ASTM specn. specify this requirement?
Thanks
Muthu