The selection of welding rod is very "tricky" and "not so straight forward"
matter. I would like to say that the original selection of E6010+E7018-P1
may be the appropriate even though the specified/guaranteed strength level
of the WM is somewhat to far less than that of the BM. If you feel it is
difficult to clear the PQR you may use E8018-P1 for outer pass, but I
recommend to use E6010 for root run. This is mainly because its ease in
welding at low current for root run (thin and detachable layer of slag is
an added advantage). Also, the lower strength weld metal may be a safer
choice to avoid typical problems of root cracking, particularly, X65 grade.
But please note that the lower strength of E6010 may be compensated by
higher strength of E8010. And the same proportion should be judiciously
followed.
I hope this clarifies,
Best regards,
Prasad
"G.Alagarasan"
<galagarasan@redi
ffmail.com> To
Sent by: materials-welding@googlegroups.com
materials-welding cc
@googlegroups.com
Subject
[MW:1787] Re: Query on SMAW
19/03/09 06:07 PM electrode selection for API 5L X65
Please respond to
materials-welding
@googlegroups.com
Ari,
Offshore Pipe industry prefer to use 6010 for root
1.to avoid root defects
2.better ductility than 7010 and 8010.
3.welder friendly electrode
Though electrode is classified under 6010, its UTS and YS will be higher
than 70 Ksi.
Regards,
Alagu
On Thu, 19 Mar 2009 Ari wrote :
>
>Dear All,
>
>Can you please advise, why E6010-G (root) & E-7010-P1 (hot/fill) are
>used for Oil pipelines(Sour) containing parent material of API 5L X65.
>Since these type of PQR/WPS are being approved by most of the
>Company.
>
>As, X65 has an YS of 65,000 Psi, whilst the electrodes used E6010 has
>YS of 48,000 Psi, and E-7010-P1 has YS of 60,000 psi. By using both
>of these electrodes the weld metal strength would not exceed YS
>60,000 psi.
>
>How its acceptable to keep the low weld metal strength(<YS 60,000 Psi)
>than the parent metal (= YS 65,000Psi).
>
>Thy suppose to use E8010 for root and E8018 for hot/fill, for API 5L
>X65 materials, which only would give the equivalent WM strength.
>
>As we all know that overmatching weld metal strength causes gross
>section yielding in the pipe, whereas Undermatching weld metal
>strength will cause straining of the weld.
>
>Your advise/suggession, based on experience is appreciated.
>
>Regards,
>
>Ari
>
>>
Save a tree...please don't print this e-mail unless you really need to.
Save a tree...please don't print this e-mail unless you really need to.
This email and any attached files ("Message") may contain confidential and/or privileged information. It is intended solely for the addressee(s). If you receive this Message in error, inform the sender by reply email, delete the Message and destroy any printed copy.
Any unauthorized use, distribution, or copying of this Message or any part thereof is prohibited. Emails are susceptible to alteration. Neither Technip nor any of its affiliates shall be liable for the Message if altered or falsified nor shall they be liable for any damage caused by any virus that might be transmitted with this Message.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---
No comments:
Post a Comment