[MW:4323] Re-welding of completed weld joint

Posting a query from a Message Board:

Good Morning Everybody,

We have following situation during fabrication of a pressure vessel :

There are 3 Long seams in a fabricated Shell section.
Welding of all 3 seams are completed and all NDT are balance for these seams.
There are some stringent dimensional requirements as per client's specification. Due to high thickness, significant distortion (peak-in/out) had occurred. Now production people is planning to correct it. For that, they have removed some 50% of one side of weld in one particular joint by grinding. And planned to re-weld it to negate the distortion effect.

Shell material is SA387 Gr 11 Cl 2 with SA 240 Type 410S cladding having thickness of 44.5+4.5 mm.
Pre-heating, Interpass Temp., DHT & ISR/PWHT are required as per WPS.

Now my question is
(1) Is it allowed as per general engineering practice of pressure vessel fabrication ?
(2) Can I call it a repair and can use WPS of weld-repair ?
(3) Is it a case of NCR ?
(4) Is it acceptable as per Code ?

Please suggest your views on this.

Regards,

Krissy

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