Thanks David for clarifying, But then why AI is insisting on doing PWHT of this fillet weld? When I asked for justification, he is saying that since full vessel was originally pwhted (due to butt weld thickness of 50 mm), this new repair fillet weld would have to undergo pwht. Is there any code...
@David The vessel was PWHTed during initial construction because the shell thickness was 50 mm. Now we are attaching supporting plates of thickness less than 10 mm only.
@weldstan My question is why should I look for alternate welding methods of PWHT or why I go for preheat? Why PWHT or its alternative methods are required?
UW 40 or UCS56 not fulfilled for this throat thickness.
A Section VIII, Div. 1 vessel was originally PWHT for code related reasons only. However, the vessel is not stamped. An R Certificate Holder while modifying the internals, welds a 10 mm thick demister support ring internally with the shell of 50 mm thickness by fillet welding. The weld throat...
