That is a short term load tho and the load calcs give you a lot of wiggle room on the amps you need to use in the calculation. Most of the amps are drawn while you are striking the arc. My 230a Buzz Box still runs on a dryer plug (30a) and has happily done it for almost 50 years. I cut the original 50a plug off and put a dryer plug on it day one. (~1972). Three prong dryer plugs are my go to 240v plug here. I have six
10-30Rs here and one dryer. I also have a 25' and a 50' dryer extension cords. ;-)