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[MW:22034] PWHT holding time range for Pqr acc.to EN15614-1

By Materials & Welding
Hello friends,

I have a question about welding procedure qualification with post weld heat treatment which will be prepared as per EN 15614-1.

Material 13CrMo4-5 group number 5.1 as per ISO 15608. Material thickness 25m and diameter 273mm.

As per EN 13480-4 it requires Pwht holding time (2xt) = 50 minutes.

As per EN 15614-1, t=25mm thickness, qualification thickness range is 12.5<t<50mm.

 

If we do pqr with holding time 50 minutes,

1.       Does it qualify 50mm thickness with Pwht (as per EN 13480-4 t=50mm requires 100minutes holding time)

2.       What will be holding time for t=12.5mm material at reality (it will be same as pqr which we hold 50minutes, if so there is conflict with EN 13480-4 because as per this standard t=12.5mm require 25 minutes holding)

3.       For to qualify pqr in case weld repair after pwht, what shall be my holding time?

Pwht subject is not clear for me on procedure qualification. Hence there is several pqr I need to prepare and most of them with Pwht. I hesitate if the pqr which I prepare will not qualify repair weld after PWHT.

I need your help about issue.

Thanks in advance.

 

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