[MW:35306] Re: SA 387 Grade 22 Cl.2 - Welding Crack

Hi Dear

You should do DHT operation immediately after finishing the welding process

post heating is to minimize the susceptibility to cold cracking due to residual hydrogen in the welds and to minimize problems due to low as-welded toughness. Because of hydrogen pick up during the welding process, a dehydrogenation heat treatment is applied to the weld to outgas the hydrogen before a weld allowed to cool.

DHT will be started at 300 C within a minimum 200 mm band with weld in the center line promptly at the first strike of arc and will be finished minimum 2 hours after taking the strike off the base metal.

Thanks,

On Wednesday, September 11, 2024 at 1:52:03 PM UTC+3:30 williams p wilson wrote:

Hai Experts,

Greetings!!

Hope you are doing well.

We found crack on Turbine Exhaust Stack butt weld joints made by 6 mm thick, SA 387 Grade 22 Cl.2 

We repaired with E91T1-B3 with FCAW welding process  with a preheat of 140 degree C , maximum Interpass temp. of 240 degree C.

But again welding crack observed while doing the MPI, request to please share your comments to solve this matter.

Thank You & Regards

Williams P Wilson

+968-94600828

QA/QC Engineer

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