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Yes the general theory says increasing heat input will reduce the impact values. But the feedback from the consumable manufacturer is because of low heat input PQR fails. He is suggesting to increase the heat input for better values. Manufacturer feedback is somehow contradictory. Now can't proceed further without correct root cause.
One more thing, can welding consumable with more nickel content will satisfy the requirement?
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Please see the attached, info on typical FCAW consumable conforming to AWS E71 T12 CJ specifications. Qualifying PQR with FCAW process on 70mm thk plates with PWHT and with impact @-46 Deg C is not easy. Following areas should need attention:-
· Impact values of the consumable, qualification position , 1G or 3G?
· If required ask the consumable manufacturer for impact results in 3G position.
· Your coupon passed in 2G, that’s due to the stringer bead technique and lower heat input, what were the recorded heat input??
· Any data on results of the similar product with PWHT(ask consumable manufacturer).
· In order to have a good and consistent impact 1.2.-1.4% Mn or more would be desirable. However in case of hardness restrictions, Manganese have to be restricted.
· Last of shielding gas, for consistent -46 Deg C impact on 70mm thk coupons, use of mixed gas, 80/20 Argon+CO2 or better(90/10). Would be advisable.
Thanks.
P.Goswami.P.Eng, IWE.
Independent & Consulting Welding & Metallurgical Specialist
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgos...@quickclic.net,pradip....@gmail.com
Cell/Whasapp:1-905-9793232
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