Welding is not an approved repair on a McCauley spinner. We had a Cessna 414 get a red tag on the door handle by an over zealous FAA inspector doing a ramp check on another plane, and saw it.
I have seen positive and negative results from welded spinners. One failed in flight, and spun down the leading edge in flight, causing a bunch of sheetmetal damage. Others just plugged along.
Remember, if its not an approved repair, your airworthiness certificate (block 13) is not valid, and your insurance will be at risk.
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