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Nice pictures of the ISC with deposits. Good find. This is behind a lot of rough idle/stalling with these engines. I have usually seen dry powdery deposits choking off the air bypass passage ways. Seldom see the ISC itself go bad. This is a clean up and reinstall for sure.
 

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Applying a weld bead to the tip sounds like a strange attempt to fix by a prior owner. I assumed it was some solidified carbon deposits. Why would anyone try to weld on the tip? Looks like you did a really good job reshaping it. Hope it works. Let us know how it turns out.
 
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