I have the same welder. 2.3A at idle (fan) 47.5A at max output (235AC/160DC), I used #6. One day I may get a 300-400A machine and I am good, instead of pulling #10 out and pulling #6 in. Also, same circuit powers my 50A RV receptacle outside of building. #6 neutral also.
With this said, #10 on...