When the code (section QW 403.6) specifies this clause does not apply when a WPS is qualified with a PWHT above the upper transformation temperature, what temperature is it referring to? I assumed that this upper temperature was the quenching temperature? The reason I ask is I am looking for the clause in ASME that allows you to, for example, qualify on 19mm and weld down to 4.76mm if you use PWHT.