You may use 87% Argon + 10%Helium +3% Nitrogen. (as backing and shielding)
Maintain inter pass temperature below 100 C.
Use ER2594 Filler Wire (ESAB or DAIKO Brand)
Most importantly, make sure you do pickling and passivation after welding, for the time specified for Super duplex materials. ( you will find the time in
pickling and passivation gel itself. We used S weld gel)
Im sure you will reap the result. we got Corrosion value as = 0 MDD
Thanks and Regards
Aneesh Kizhakkekalam
QA/QC Manager (Saudi Aramco Project)
On Tuesday, July 18, 2023 at 8:26:20 AM UTC+3 Ashish Chacko wrote:
I am currently working on developing a Procedure Qualification Record (PQR) for Duplex Steel. In the process, I conducted welding using the base material SA 790 (UNS:32205) and utilized two different filler wires: ER-2594 and ER-Nicr-Mo-14 for different coupons. Size of the coupon 6" Thick:10.97 mm.
However, I encountered a concern during the corrosion testing phase, as per ASTM A923-03 standards. Both test materials failed the corrosion test. I'm seeking guidance from the experts in this group to understand the possible reasons for the failure and to explore potential solutions or alternative approaches.
If anyone has experience with similar issues or insights into the matter, I would greatly appreciate your assistance.
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