[AT] Wire size for welder?? Help welder people!

[John Wilkens]

If I have a 230 volt mig welder that is rated at 45 amps input current I 
assume I would want a 50 amp 230 volt breaker .  But what minimum romex 
wire gauge would I need to run 25' from the breaker box to the outlet box 
for the welder?   For years I've used 10 gauge wire for my 225 amp output 
Lincoln buzz box.     John W.

                    In the wide-open spaces of NE Oregon