If it is pipeline, go with GMAW or FCAW but if it is a piping spool you'd better use GTAW for root & hot pass and filling & cap with SMAW or FCAW.
Whatever filler metal you use (should be Ni-alloyed), do not exceed the base metal strength by more than 10 ksi since it won't do any good except more cost and care during welding. Check the vendor catalogue for instructions.
Ramin Kondori 
QC/Welding Engineer
IWE AT 0070
On Thu, Jan 26, 2012 at 7:50 AM, Fitria Rahman <t.chintaqa@gmail.com> wrote:
in most situations, you will receive numerous suggestions with several
electrodes falls under E80XX. If you are not going with PWHT, i would
rather suggest you to go with E81T1.
To me, TIG process is not suitable for large diameter - 30".
Rgds
2012/1/25, Lakshman Kumar.B <lakshmankumar4@gmail.com>:
> DEAR,
>
>
>
> Is GTAW is required?
>
> We used SMAW or GMAW for the root and remaining for with FCAW or GMAW which
> is more economical and good work progress.
>
>
>
> Thanks and Regards................?
>
>
> cid:image001.jpg@01CC3048.5836D9B0
>
> Lakshman Kumar.B|Manager |Lanco Infratech Limited
>
> Plot No 1255 | Sanjeevani chowk | Mahanadi vihar | Cuttack 753004
>
> Phone : + 91 671 2445033 | Mobile : +91 9937286851 |www.lancogroup.com
>
> Go Green|The future will thank you
>
>
>
>
>
> From: materials-welding@googlegroups.com
> [mailto:materials-welding@googlegroups.com] On Behalf Of Mohamed Elsayed (
> BTG)
> Sent: Tuesday, January 24, 2012 9:42 AM
> To: materials-welding@googlegroups.com
> Subject: [MW:13556] Welding API 5L X70 By ER 80S-Ni1 + FOX EV 60
>
>
>
> Dear,
>
>
>
> We have material API 5L X70 , 30" O.D ; Thk. 13.33mm , we are planning to
> do PQR using ER 80S-Ni1(mod) 2.4mm for GTAW and E8018-C3H4R - Bohler welding
> consumable. Is it correct?
>
>
>
> Please advice.
>
>
>
>
>
> Thanks
>
> Mohamed
>
>
>
> --
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> w.r.t. applicable code/standard/contract documents.
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