[MW:4032] Impact

Dear all,

 

I am facing the problem of impact test at -60 deg C in welding.

 

The material is SA 537 Cl 1 and welding consumable used is E7018 C1L ( Advani make). as C1L contain Ni its weld should pass impact but the same is not.  where as impact is OK with E-7018 C3L electrodes.

 

can any body suggest ????

--
Amarjit Singh