Limesh;
See ASME Sc.IX QW-290. Use of temper beading is typically restricted to repair. Qualification in accordance with QW-290 is not trivial. However, the concept is fairly easily understood. One controls the heat input of welding layers such that the HAZ is tempered by the heat of subsequent welding passes. Bead sequencing and welding parameters must be controlled and are different than used in normal welding. Either close observation of the weldor or a weldor who understands the process, its demands, and is willing to perform as required must be employed. More than likely one would employ both.
John
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
Sent: Tuesday, July 27, 2010 3:04 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:6140] Re: Welding of ASTM A 335Gr.P11
Dear All,
Thank you verymuch for the valuable inputs.
@Manpreet,I would like to know more about bare electrode usage and temper bead technique in depth.
What is the difference between temper bead technique and normal welding technique?
Is there any different sequence of layering technique we are following in temperbead ?
If so how we can ensure it always since the welders are not much bothered about systematic layering?
If you don't mind please share some presentation or simulation on temperbead technique.
Thanks and Regards,
Limesh
On Tue, Jul 27, 2010 at 10:19 AM, manpreet <manpreetsin88@rediffmail.com> wrote:
Dear All
Completely agree with Mr, Hegazy.
Mr. limesh, there is nothing as such E7018 B2 (E7018 B2L is available).
ASME SECii part c, the best suitable covered electrode is E8018 B2, which you can use without PWHT with temperbead technique.
If you want to use the bare electrode or info regarding temperbead technique,Pls let me know.
Regards
Manpreet Singh
Welding Engineer
SpiecaPag LPG-LNG Project
On Sat, 24 Jul 2010 23:27:01 +0530 wrote
>i have specified "not E-7018B2" in my reply since it is not listed in
AWS classification. only 8018B2 is listed in addition to 7018B2L.
there is no restriction on use of both of these grades.
On Jul 24, 12:32 pm, MOHAMED HEGAZY wrote:
> Dear Raghuram,
>
> I Believe that as strenght point of view it's ok to use E7018B2L but why i have to go for this low carbon grades while there is no need for that specially that the base metal itself has a 0.05 to 0.15 %C range which will be higher than weld metal and conequently may cause carbon to migrate from HAZ to the weld metal resulting in embrittling effect & in case of high operating temperature this carbon is highly required to stablize the the chromium atoms in the weld metal to avoid loosing the strenght & creep resistance at high temperatures.
>
> So I recommend not to go for E7018B2L & as long as there's no E7018B2 so E8018B2 is more matching for this case .
>
> Another points of view are encouraged.
>
>
>
>
>
>
> Regards
>
> Mohamed.Hegazy
> F.S.I Coordinador
> PgDip of Welding Engineering
> AWS Certified Welding Engineer CWEng.
> TWI CSWIP Welding Inspection 3.1.
> VSA Consortium ( VEOLIA, SAIPEM & ALJABER )
> Power & Energy Projects.
> QATAR SHELL PEARL GTL Project.
> Ras Laffan ,Qatar
>
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>
>
> --- On Thu, 7/22/10, Raghuram Bathula wrote:
>
> From: Raghuram Bathula
> Subject: Re: [MW:6084] Welding of ASTM A 335Gr.P11
> To: materials-welding@googlegroups.com
> Date: Thursday, July 22, 2010, 5:50 PM
>
> you can use E-7018B2L (not E-7018B2). the “L-Grades” are limited to a maximum of 0.05% carbon. While the lower percent carbon in the weld metal will improve ductility and lower hardness,it will also reduce the high-temperature strength and creep resistance of the weld metal.
>
> Generally it is not a problem with P11, but in case of P22 if the operating temp is > 450 °C, one must not use low carbon grades
>
> On Thu, Jul 22, 2010 at 6:21 PM, limesh M wrote:
>
> Can we use E-7018B2 instead of E-8018B2 for welding of A-335 Gr. P11
> material. If yes then what care shall be exercised during welding?
> Would the resulting weldment be of adequate strength?
>
> Thanks and Regards
>
> Limesh
>
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