Metal Casting - Weld Guru

Summary: Casting is a process by which a material is introduced into a mold while it is liquid, allowed to solidify in the shape inside the mold, and then

I am trying to make an impeller but am struggling to get the exact shape of the inner curve ( red highlighted) so I can welding it properly. Any ideas fellow redditors?

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Metal Casting - Weld Guru

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