Mr. Goswami,
Is it possible if we use duplex consumables from root to capping?
The reason is to simplify the welding consumables since we also have welding of duplex flange to Pipe CRA using duplex for the welding consumables.
Regard's
Budi Witjaksono
Project Manager
Phone: +62 778 413 250 ext: 135
Mobile: +62 811 770 5039
Fax: +62 778 413 260
Skype: budi.witjaksono
Email: budi.witjaksono@profab-group.com
Website: www.profab-group.com
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Saturday, March 16, 2013 10:21 AM
To: materials-welding@googlegroups.com
Subject: [MW:17114] RE: 17098] Welding Of Pipe CRA to Pipe CRA
Hello Budi,
The brief responses to your query are as follows:-
- weld Root with GTAW ER316- This is O.k as long as the root pass is contained within the clad (S.S-316L). However while containing 316L run within the clad, one has to ensure that root pass is free from weld defect, such that no repair is warranted
- Hot Pass with SMAW E309L Mo --this is acceptable, as 309MoL( 25Cr/12Ni/2.5 Mo) with will tolerate the dilution of the ferritic API 5L X65 steel
- Subsequent Fill/ Cap with E316L--Not acceptable, why?? Calculate the weld metal composition at the weld /HAZ interface. Assume nominal 20 % dilution occurring at the interface. What would be the 316L(19Cr/12Ni-2.5Mo) chemistry with this dilution? The weld metal could be just borderline austenitic. The weld ductility could be a factor. Hence the advice is to continue welding with 309MoL right up to the cap.
The other alternative would be to use 309MoL welding consumable ( both GTAW & SMAW process).For the root pass+one hot pass, use GTAW, followed by SMAW the rest. This is suggested provided the client allows weld metal of slight different chemistry for the wetted surface.
Note:-309MoL weld metal may have slightly higher ferrite no that 316L base metal.
Thanks
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario, Canada.
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Budi Witjaksono
Sent: Thursday, March 14, 2013 9:40 PM
To: materials-welding@googlegroups.com
Subject: [MW:17098] Welding Of Pipe CRA to Pipe CRA
Gents,
We have CRA pipe to be welded to CRA pipe (API 5LX65 16-in NB x 23 WT with 3 mm 316L cladding) to be welded from one side.
One electrode supplier suggesting to weld Root with GTAW ER316, Hot Pass with E309L Mo and Fill/ Cap with E316L.
Could you please advise whether advisable to use E316 L for Fill and Cap? Please assist to respond with technical back-up since I need to convince our welding manager.
Regard's
Budi Witjaksono
Project Manager
Phone: +62 778 413 250 ext: 135
Mobile: +62 811 770 5039
Fax: +62 778 413 260
Skype: budi.witjaksono
Email: budi.witjaksono@profab-group.com
Website: www.profab-group.com
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