RE: [MW:26699] Welding of F91 material

Hi MNK,

What were the temperature/time parameters of the :

1. Weld preheat heat treatment (PHT) and interpass?
2. The post weld dehydrogenation heat treatment (DHT)?
3. The post DHT cooling?
4. The post weld heat treatment (PWHT)?

Regards,
DT

-----Original Message-----
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of mmm
Sent: Friday, August 04, 2017 6:43 AM
To: Materials & Welding
Subject: [MW:26698] Welding of F91 material

Seal weld joint between bonnet and body
1)Weld deposit thickness is 8mm.
2)design code- API-602
3)Electrode - E9015-B91
4)base material for bonnet and valve
body- SA 182 Gr F91
5)hardness of the weld joint is 300 BHN.

Dear experts
a)Please let me know what are method to reduce the Hardness of the weld joint?
b) is this electrode is correct or not please specify if its wrong

Thank you.
MNK

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