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[MW:4890] valve to pup piece

By Materials & Welding
Dear All

this is a case of welding b/w valve & pup piece.

Material specs for v/v -ASTM 350 LF2 & for PUP -API5Lx60

thk for v/v is 39mm & for pup piece is 16 mm.

Kindly tell me, is it required to do PWHT, weld process(GTAW,
SMAW & SAW).since one is more than 19 & other is less than
19mm.

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