Beno
4 inch angle grinder with metal cut off discs first and then a 4 inch grinding stone to clean the welds back. Easy mate just take your time cutting and checking as you go.
Yeah, I know... I have everything to doing it just dreading it due to me usually screwing up stuff like this!
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Sir, I do not know how you are setup to use air tools, but I have found that die grinders (straight and a 90 degree model) with cut off wheels are a handy complement to the angle grinder. The die grinders can get into some of the spots that the angle grinder can't. Good luck. Be sure to wear hearing protection and dust filters with much grinding.