MNK
Presume the weld is F91 to it self ( P= 15E to P15E) where you require to follow certain welding discipline
i.e. Preheat -> Welding continuously not below preheat temp->Post heat at about 300-320C (If asked by client spec)-> cool below 100C to convert to martensetic sructure -> later PWHT as per Code say 730-760C Then only you will get hardness between 190-260BHN which is generaly acceptable limit
(If SMAW E9015 B9 is used with lower H control)
Regards
Hegde P.b.
On Friday, 4 August 2017 5:37 PM, mmm <mustaqnk@gmail.com> wrote:
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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