ریجکت شدن PQR متریال A333 Gr6 با فیلر مشخص شده

we have a WPS and PQR for A333 Gr 6 welded with ER 70S-3 and E7018 , the mechanical test in the PQR are only tensile test and bend test.

Our client didn't accept the PQR because is missing impact test and he ask to repeat all the PQR with all mechanical test ( with ER70 S-6 for better impact test result ).

it's possible to keep the PQR and to make only the impact test ( we can weld a 6" pipe according the WPS but with ER 70 S-6 and take specimens for impact test ). ????

we have  to weld an ammonia liquid line ( temperature of service -33 °c) with ER 70 S-3 for penetration and E 7018 for filling and cap .

Our client ask to weld with ER 70 S - 6 because of better impact test proprities.

THis is true ?? please give me more details

ER-70S-6 

has  high Manganese and provide more UTS values comparatively..

 

You can try 80S-Ni filler Wire under SFA 5.28 and this filler provides impact @ -46 Deg C. Similarly

 while E 7018 provides  27 J at -30 deg. C  , E 7018-1 provides at -46 C

Yes, the impact properties of ER 70S-6 (27 J at -30°C) is better than that of  ER 70S-3 (27 J at -20°C)

Please refer Sec II Part C SFA 5.18