Seeking FEA Help with Final Year Project

AI Thread Summary
A final year mechanical engineering student in Ireland is seeking help with a project focused on reducing solidification cracks in a NI-Super alloy weldment. They believe that finite element analysis (FEA) could help them understand the stresses and strains during the welding process but lack experience in thermal analysis. Responses suggest that FEA may not be suitable due to the rapid cooling and changing metallurgical properties of the weld pool. Additionally, consulting a metallurgist is recommended to address crater cracking issues, and considerations regarding preheat temperatures, interpass temperatures, carbon content, and weld joint geometry are highlighted as important factors. The discussion emphasizes the complexity of welding brittle alloys and the need for expert guidance.
Dixie14
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Hi Guys,

I'm new to the forum so please be gentle with me.

I am a final year mechanical engineering student in Ireland and i am doing my final year project on reduceing solidification cracks that are occurring in a weldment of a NI-Super alloy during the welding process. I believe that a FEA of the process that would show me the stresses/strains that are occurring as the weld pool solidifies would be of great benefit to me but i don't know where to start. I've done a bit of FEA work before but never on thermal analysis. Does anyone know of any online tutorial that might help me or if ye could maybe steer me in an appropriate direction id really appreciate it.
 
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FEA would not be good for this. The weld pool is cooling very fast and going thru a phase change with the metallurgical properties are constantly changing. You should consult with a metallurgist about the crater cracking that is occurring. Have you considered the preheat temperatures and the interpass temperature yet? Also, how high is the carbon content? Welding of a brittle allow is very tough. Also, is the weld joint geometry and weld prep correct?

Thanks
Matt
 

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