For welding 40 mm thk. EN8 flange, with SA 106 Gr. B pipe, you can use any
low hydrogen electrode like E 7018.
The preheating is required at 250 to 300 deg. C. Pwht to be carried out at
640 ± 20 deg. C even if the vessel service conditions in this case is not a factor.
From: Rajnish Dixit <rajnishcv@yahoo.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Tuesday, 13 August 2013 8:56 AM
Subject: Re: [MW:18408] Welding of EN 8 to SA 106 GrB
Good Morning,
I hope that docs for this material to be used in pressure vessel (as per ASME sec. VIII div. 1) are approved by designer/ client hence there should not be question for the suitability. Also considering that the vessel is not to be stamped like 'U', etc.
EN8 is carbon steel material and as it is not listed in ASME, it has no P no./ grp. no. In this case you have to qualify a WPS/PQR for EN8 (unassigned material) to A 106 Gr B ( P no. 1, Group No. 1). Welding consumables for this may be used GTAW : ER-70S2, SMAW-E7018/ E-7018-1.
PWHT will depend upon:
1. service requirement
2. thickness of welded parts and HAZ (if PWHT is not mandatory as per pt. 1)
Thanks & Best Regards,
Rajnish Dixit
Rajnish Dixit
In the interest of environment please don't print this e-mail unless you really need to.
From: Riaan Stoltz <Riaan@ritc.co.za>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Monday, August 12, 2013 1:47 PM
Subject: [MW:18403] Welding of EN 8 to SA 106 GrB
Good Day Experts
We need to weld a EN 8 40mm flange(not listed in ASME) to a SA106 Gr B 14'' schedule 40 pipe. This will form part of a pressure vessel being built generally in accordance with ASME VIII Div 1.
The vessel service conditions in this case is not a factor.
Please advise on the following.
1. Is a pwht cycle required?
2. The best selection of SMAW electrode?
Your valuable input will be greatly appreciated.
Regards.
RIAAN STOLTZ
RITC INSPECTION
083 640 5909
021 556 4884 (TEL)
021 556 6941 (FAX)
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