The issue with 110v welding machines tends to be lack of penetration on thicker materials (3/16 and thicker). Until some experience is gained, it can seem as if a weld has been made, only to discover that the bead did not penetrate sufficiently. Also, a regular 15 amp household circuit breaker will trip regularly using a welder on it, so 20 amp should be considered a minimum for those machines. An arc welder running on 110 volts can do some decent welding for small shop stuff if using small electrodes and multiple passes, and tends towards better penetration than a 110 volt wire feed welder.