Rob, didn't mean to be a smart a$$...
A stick welder draws more amperage than a Mig welder so unless you are using very tiny electrodes you need the higher amperage avaialble with 220 service. The stick welder has a transformer inside that steps down the voltage and ups the amperage. Open circuit voltage on a stick machine is typically around 30-50 volts and amperage is constant according to what you set the machine at. Even a small home 'buzz-box' will easily weld 3/8" - 1/2" plate but the machine is working pretty hard and will need a cool down period now and then.
Typically the duty cycle on a small stick machine is similar to the small MIG machines...roughly 20%.
The big dog machines you see in a shop are as big as they are to get between 60% and 100% duty cycle.
A bit more info for you. A stick machine is also known as a 'constant current' machine. You set the amperage(current) and the voltage will vary as it needs to depending on arc length, and rod angle etc etc. If you had a meter on it while someone was welding and had it set at 100 amps...you'd see that plain as day.
A MIG machine is also known as a constant voltage machine. To set the heat you adjust the voltage seen at the tip of the wire. Usually between 17-32 volts depending on the size of the machine. Then the amperage will vary depending on how much wire speed you have, stick out length etc etc. Again with a meter hooked up you would see that plain as day.
Our machines at work are all digital readout and infinte adjustmant Millers. We have a CV Miller that's good to 35 volts and 400 amps for small wire feed stuff, and we have a dual purpose machine for Stick welding (600 amp CC) and heavier wire (35 volts and 600 amp)
This reply is getting a little long, but the general jist is if you're building bumpers and stuff the stick welder would be OK...with a fair bit of practice. If you plan on smaller thinner stuff or any rust repair a small 110 volt MIG would be better.
Hope that clears a few things up. /forums/images/graemlins/weld.gif
Rene