A lot of people think a low amp 110v welder is good for spot welds on sheetmetal,however you need to make a quick weld w/good penetration which requires some amperage. Be carefull of your choice there are 110v welders that do not have enough amperage or duty cycle. Try to get one of the big three.......Miller,Lincoln, or Hobart.If y can get a 220v it will be a good investment.