Re: [MW:12146] Repair procedure on severely punctured root

It is better go with P Goswami suggesstions, This thick weld metal not required pwht. Since GTAW is used for build, tempering of bead will take place , no require HT

pandithan

On Sat, Aug 6, 2011 at 10:31 PM, sudhakar kuppuswamy <mechsudhakar@gmail.com> wrote:

 

 Dear all,

                      Further to Mr Ramin Kondori comments, I like to add some more point to this discussion, I too suggest PWHT for that joint, since repair weld buttering or built up with GTAW, the deposit of weld metal will be in small layer .So cooling rate will so high which may leads to martensite formation (Hard structure), more over HAZ would have been subjected to uncontrolled heating and cooling during initial and repair welding.

               So It will be better to carry out a PWHT on that Joint by studying the  design temperatures& mechanical properties requirements. If toughness requirement is there it always better to do  a PWHT. 

---------- Forwarded message ----------
From: sami ali <sami_irq@yahoo.com>
Date: Sat, Aug 6, 2011 at 9:10 PM
Subject: Re: [MW:12131] Repair procedure on severely punctured root
To: materials-welding@googlegroups.com

Yes you need to do PWHT after checking  that the hardness is out of the tolerance value after welding. I think if you weld the root and hot by GTAW +filling by SMAW you will pass. Regards SAMI --- On Fri, 8/5/11, Ramin Kondori <raminkondori@gmail.com> wrote: From: Ramin Kondori <raminkondori@gmail.com> Subject: Re: [MW:12125] Repair procedure on severely punctured root To: materials-welding@googlegroups.com Date: Friday, August 5, 2011, 9:58 PM Wherever you have large amount of welding, you need PWHT... If you have a standard joint, then 19mm or 25mm criteria roles for PWHT but when the gap is 10-12 mm then the weld volume is high enough to call for a PWHT You can draw a sketch and calculate the volume of the weld in a 19mm thick pipe, then draw a sketch of you joint with 10-12 mm gap and you will see the weld volume is much more... Of course it is a matter of engineering judgement. You should consider you fluid, process parameters like temperature, pressure and design requirements. In my opinion if your specifications requires PWHT for thicknesses above 19mm (for this line) then you should probably carry out PWHT because of your weld metal volume.   Regards Ramin  Kondori    QC/Welding Engineer           IWE AT 0070     On Fri, Aug 5, 2011 at 9:29 PM, pgoswami <pgoswami@quickclic.net> wrote: Ramin.   Why PWHT? Does a weld thickness of 12.7 mm on  SA 106 Gr B base metal require any PWHT as per any commonly referred boiler and pressure vessel code?   I would think the suggestion of Prem Nautiyal is the way to go.   The technique referred is" common bridging technique" to close in wide-root gaps, which is quite common for manual GTAW. Using 6010 with 10-12 mm root gap would not be safe , as the welder would not be able to control the weld puddle.Hence GTAW would be the preferred technique to bridge the root and proceed further.   Thanks.   Pradip Goswami,P.Eng.IWE Welding & Metallurgical Specialist & Consultant Ontario,Canada. Email-pgoswami@sympatico.ca, pgoswami@quickclic.net   From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ramin Kondori Sent: Friday, August 05, 2011 11:10 AM To: materials-welding@googlegroups.com Subject: Re: [MW:12121] Repair procedure on severely punctured root It's better to apply PWHT after completion of the weld. Regards Ramin  Kondori    QC/Welding Engineer           IWE AT 0070     On Fri, Aug 5, 2011 at 12:50 PM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote: Yes you can do weld buildup on the punctured rootface by ER70S-2 (TIG) till you get a uniform root gap of @3mm. Then weld the root run with ER70S-2 and complete the joint with E7018 provided you have a WPS / PQR for the same.   Regards   Prem Nautiyal --- On Fri, 8/5/11, limesh M <limesh78@gmail.com> wrote: From: limesh M <limesh78@gmail.com> Subject: [MW:12110] Repair procedure on severely punctured root To: "Materials & Welding" <materials-welding@googlegroups.com> Date: Friday, August 5, 2011, 10:45 AM Dear All, Material : ASTM A106 Gr. B Thickness : 12.70 mm Welding Process : SMAW Electrodes used as per approved WPS : SFA 5.1, E6010 (Root)+ SFA 5.1, E7018(Fill&Cap) During through thickness repair, by mistake root pass has been punctured badly(5-8cm in length after complete removal).Unfortunately,now the root gap is almost 10-12 mm wide and it is difficult to weld root again with E6010.In this case what is the better option other than cut and bevel the joint.Is there any problem to build root with GTAW by using ER 70S2 and fill remaining thickness with 7018? Regards, Limesh -- 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. -- 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. -- 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. -- 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. -- 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.

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With regards,
Sudhakar.k

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