Ok, first, I'm no electrician or engineer.
I'm contemplating purchasing a mig/flux welder for around the house. I don't have 220v in my shop. I do have a 110v 20a circuit.
Here's my question.
If some 110v mig/flux units are rated at 140+ amps output, which I find hard to believe unless they have close to 100% transformer efficiency, (how do they get such high amperage from a 110v line?) then why do the 220v models only pack an extra 40 amps?
After all, running on a 220v circuit nearly doubles the available power so shouldn't it double the available output amps?
I'm also confused when I read the fine print on the 110v units. They're labelled as 140 amp units but then hidden somewhere in the manual or webpage is a statement that goes like
Maximum output: 88amps/18v/20% duty cycle.
So where's the 140 amp rating come from? Is that like the current flow in a dead short condition for a millisecond or so? Is it the DC power equivalent into the mains of the transformer (before transformer losses), assuming an arc voltage of 17v ?
Finally, if you really can get 140 amps of current from a 110v unit why doesn't anyone make a 110v buzz-box that puts out 140 amps?
Hopefully someone has the answers for me.
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