Heat input at wps/pqr
Heat input at wps/pqr
(OP)
ASME IX at QW-409.1 writes that "...heat input does not apply when the WPS is qualified with a PWHT above the upper transformaation temperature..."
What do they mean upper transformaation temperature?
Is it the solidus of the phase diagram of the base metal?
In general if PWHT is used Heat Input is applied or not?
What do they mean upper transformaation temperature?
Is it the solidus of the phase diagram of the base metal?
In general if PWHT is used Heat Input is applied or not?





RE: Heat input at wps/pqr
RE: Heat input at wps/pqr
Heat input is a supplementary essential variable when impact testing is required by code. Regardless of whether or not PWHT is required.
Heat input would not be of concern when impact testing is required if the welds receive an austenitizing heat treatment because it is returning the heat affected zones to a "homogeneous" state, not just a post weld heat treated or stress relieved state.
RE: Heat input at wps/pqr
RE: Heat input at wps/pqr
RE: Heat input at wps/pqr
RE: Heat input at wps/pqr
Are you qualifying your WPS with impact testing?
I believe you are also qualifying with PWHT below austenitizing temperature, correct?
RE: Heat input at wps/pqr
RE: Heat input at wps/pqr
IF you were impact testing AND PWHT above the austenitizing temperature, then heat input control would not be required.
Hope that helps.