| 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_INSPECT@YAHOO.COM
--- On Thu, 7/22/10, Raghuram Bathula <raghurambathula@gmail.com> wrote:
From: Raghuram Bathula <raghurambathula@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 <limesh78@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
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