The cases are aluminum alloy. Aka, lots of other junk metal mixed in with aluminum. That stuff is quite difficult to weld. I think that someone who is competent with a TIG can probably get it done, but you'll have to talk to such a person first. I weld with different systems, but I only have very basic training in TIG.
I actually had a Cobra T5 a couple years ago that had one of those very ears broken off! I scored a good case off ebay for $15. Cheaper and easier than welding. :yelpleased:
I've welded a bunch of aluminum transmission cases. Some are easier than others. 4043 is the correct rod for cast aluminum. Don't be surprised if the weld has a bunch of pin holes in it where the weld meets the case. If the part that is broke isn't very large I would toss it and just build the weld up and mill it flat and redrill the hole instead of welding the broke part back on. It would be stronger this way.
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