PWHT

[tonnesen]

Hello,

I would like some help in determining the necessity of PWHT because I didn't understand very well the paragraph UW-40(f)(5)(d) about determining the nominal thickness of groove+fillet weld.

The groove design is similar to that in figure UW-16.1 (y-1).

The weld is between a head and the nozzle neck.

The thickness of the head is 32 mm and the thickness of the nozzle neck is 106 mm, should I consider the nominal thickness equals to thickness of the head (depth of the groove) + fillet weld throat dimension or should I compare them and use the thicker one?

To calculate the holding time at the PWHT temperature and the heating and cooling taxes should I use this nominal thickness or should I use the thickness of the thicker part, in this case, the thickness of the nozzle neck?

Thanks!!

 

[tonnesen]

Another information is that the groove is a double bevel and we have fillet welds in both sides.

 

[metengr]

Nominal thickness as stated in Section VIII-Div 1 UW-40 (f) is the thickness of the welded joint, and not the pressure part thickness (thicker part).

 

[tonnesen]

metengr,

In your opinion, in this case what part of the welded joint should be considered as the nominal thickness? The head thickness, because it's a full penetration joint?

 

[metengr]

Yes, if it is a full penetration welded joint.