"Goose pooper" - now that's a new one for me! I've got a lot of years as a professional welder, thought I heard them all.
DO NOT WELD!!! DO NOT WELD!!! DO NOT WELD!!! DO NOT WELD!!! DO NOT WELD!!!
If the barrel is bad, replace it with a known good quality new one. A few dollars saved won't mean a thing if it blows-up in your hand and in front of your face! Sorry, I'm not as tactful as Harry when it comes to safety issues.