Re: [MW:35245] SA 387 Grade 22 Cl.2 - Welding Crack

Dear, 

From the look of the crack it seems this is a hot crack. The reason of this is likely due to not being able to manage the welding parameters. take care of the following: 

Lower the heat input: Adjust welding parameters to reduce heat input, especially given the thin material (6 mm).

Ensure uniform weld bead geometry: Aim for a balanced, wider bead to minimize centerline solidification cracking.

Verify material cleanliness: Ensure the base metal and filler wire are free from impurities.

Monitor preheat and interpass temperatures: Keep the heat input consistent across the entire weld to avoid uneven cooling.

Refine welding technique: Control weld speed, clean between passes, and ensure proper FCAW process controls as per the WPS. 

keep us updated after following the above please. 

Thanks, 

On Wed, Sep 11, 2024 at 1:21 PM williams p wilson <williamswilsonp@gmail.com> 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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