Thanks for your reply.
I haven't verified ferrite scope against solid material. I will do that.
Ferrite after 2nd layer is quite low as i am using nitrogen mix gas to pass corrosion.
Wire selected as per client specifications.
Intermetallics not checked yet.
Thanks for tour prompt reply.
First attempt of PQR failed in corrosion (923 Method C)with 300mdd (acceptable 10mdd), further tests haven’t done due to this.Pure argon was used as shielding gas.
2nd attempt of PQR,2%Nitrogen mixed argon is used for ER2594 first layer and pure argon for 2nd...
Hi
I have super duplex weld overlay PQR on carbon steel pipe need to have ferrite 35 to 60% and ASTM A 923 PART C to be passed.
Base material thickness-7mm (carbon steel pipe)
GTAW-pulsed hot wire machine welding
First layer-ER309LMO (1.2 mm wire)
2nd layer-ER2594 (1.2mm wire)
3rd layer-ER2594...
