-----Original Message-----
From: materials-welding@googlegroups.com
[mailto:materials-welding@googlegroups.com] On Behalf Of KC
Sent: Wednesday, December 09, 2009 1:44 AM
To: Materials & Welding
Subject: [MW:3807] Welding of P5A & P5B Material
Can any body inform about the .....
For the welding of SA 335 Gr. P91 (PNo-5B, Group No-2) Material.........
1) What is the Preheating Temperature? 400F (200C)
minimum
2) What is the Post heating Temperature & Time ? Typical 1400F
+/- 25F (760C +/- 15C)
3) PWHT is require or not ? P91 should
always be PWHT'ed, only exception - ERW tube finning with qualifiers
4) While welding (GTAW) Backing is require if yes, then Argon is OK
? P91 open root welds should always be gas backed with Argon due to
high Cr.
For the welding of SA 335 Gr. P22 (PNo-5A, Group No-1) Material.........
1) What is the Preheating Temperature? 300F (150C)Code
minimum, I recommend 400F (200C)
2) What is the Post heating Temperature & Time ? Depends on
Code: Sec I or VIII 1250F (675C) min.; B31.X 1300F (705C) min.
3) PWHT is require or not ? Depends on (1)
Code and then (2) thickness, (3) diameter, and (4) type of weld -
insufficient detail
4) While welding (GTAW) Backing is require if yes, then Argon is OK
? Not required by Code, some customers want it others do not. My
opinion is that Cr content low enough it is not really required except
perhaps for highly aggressive corrosive environments certainly should
not be necessary for steam service.
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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
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