The weld pak 100 is a hobby welder.. its ok to start to learn with but for general fab it is too light duty (10% duty cycle )...
You will very quickly outpace it for general fab work. To weld non critical stuff with it might be ok.. but even as an experienced weldor I would not make any critical welds with it.. and this includes chassis fab.. fix a gate sure... weld a lawnmover deck..ok.. but not in vehicle work doing anything that might affect my safety
Dont bother buying the gas valve for it and a bottle.. waste of money..unless you are never going to do anything other than make light guage fencing and weld on sheetmetal.. harry is right about fluxcore.. its hard to weld sheetmetal with.. but using .023 hardwire the 100 will weld acceptably on light gauge
the good news is that you can play with it as long as you like and sell it anytime and make all your money back.. at that point.. when you have some experience buy a 220 volt machine and own it for for life...
We certify (ICAR) on the SP135HD in Lincoln Welding School.. and use it around NASCAR for sheet metal (if the operator is very skilled sometimes on the tube frames,, but usually we tig them)... the 135 is getting phased out for a newer series (145).. still 110 volt... I still carry the 135 on my welding rig when I need to weld on a tower, inside a manhole, or other places its hard to drag my LN25. (220v portable wire feeder machine)... but when it comes time to put out electicity I have to drag the big boy with me
For 95 percent of what people do here in this forum you can get by with a small 220v machine... but a 135,, no,, not safely.. a 100... forget it
Im a red man... but the blue guys work just as well