If your Code is ASME you need to PWHT whatever the thickness is. So the best practice is to do buttering and then PWHT. Once PWHT completed you weld to 316.
The thickness of the buttering should be such that the haz of the second weld does not fall on P91. I would suggest 5 mm
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| From: pradip kumar Sil Sent: Δευτέρα, 8 Φεβρουαρίου 2016 - 14:56 To: materials-welding Reply To: materials-welding@googlegroups.com Subject: [MW:24251] P-91 to SS Welding |
Dear Expert,
-- We have to weld P-91 Material to 316 (SS) material with ERNiCr-3 filler Wire Socket Weld.
My question is needs to do buttering the P-91 material if required how much layer we Need ?
During & After buttering needs to conduct preheating & Post heating ?
During & after welding socket weld only P-91 side or both side we will conduct preheating +post heating + PWHT
Thanks in advance.
Regards
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