[MW:6111] Re: Welding of ASTM A 335Gr.P11

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 <mh_w_insp...@yahoo.com> 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
>  
> QATAR : +9743694501 
> EGY:       +20142345614
> Email         : MH_w_INSP...@YAHOO.COM
>      
>
> --- On Thu, 7/22/10, Raghuram Bathula <raghurambath...@gmail.com> wrote:
>
> From: Raghuram Bathula <raghurambath...@gmail.com>
> 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 <limes...@gmail.com> 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
>

--
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.