Using E-7018B2 for welding A-335P11

Post by **Nabeel Ahmed Qureshi** » 20 Jul 2010, 06:27

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?
Regards
NAQ

inconel · Post by **inconel** » 23 Jul 2010, 08:12

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

Post by **ashfaqanwer** » 27 Jul 2010, 06:44

Nabeel,
There would not be any problem using E7018-B2 instead of E8018-B2 for welding of P11. Exercise the same controls as you do for E8018-B2 like preheat, interpass, post heating and PWHT.

thePetroStreet