http://www.use-enco.com/CGI/INSRIT?PMAKA=140-0005

I was complaining on another site about my crucible problem and how I
didn't have a welder. Someone said "so just buy one". I had no idea
that welders could be so cheap.

I'm not planning to buy one, but I am interested in more information.
Could the welder as linked above do the welding that I need done? (If
you don't remember, I have a 4" pipe nipple to attach to an endcap....or
I did; now I'm planning to go another route.) Would it survive a trip
through a ~1500 F furnace? How much experience/training is required to
use something like this?