Take that one back to Sears and get your money back.. I know people hate Harbor Freight but I found this little DC Inverter ARC welder there that just kicks butt! Go to HF or order it off line! This little 80 amp inverter penetrates 1/4 inch metal with no problem and the duty cycle is 35% at full power, can't beat that! I have had mine for a year now and I haven't had any problems with it at all! Plus it is DC... Check this guy welding with it on Youtube. I have a Miller Thunderbolt AC\DC and a couple other welders and I use this one all the time! Small, easy to setup, weighs 8 pounds, plugs into 110v, you can take it anywhere just about and weld.
This thing really gets the job done even on 1/4 inch plate!!!http://www.youtube.com/watch?v=bujvEHMcnEEhttp://www.harborfreight.com/cpi/cta...emnumber=91110