Thanks for the info...Oxy-Propane sounds like a good option, as I'm not wild about the sooty floaters that Acetylene creates...my workshop is in my basement and I'd hate to get soot all over the house. And, of course, I can just go to Sears and pick up a Blue Rhino tank for $20. The only time I think I would weld would be if I planned on cutting/grafting lugs together for sloping top tubes and that sort of thing. PaPa, I googled for oxygen concentrator and all I found was for medical applications. Do you have any more info on what to look for in an oxygen concentrator?

Thanks,

Pete