I found my AGA guide to welding equipment. There are a couple of
useful tables and rules of thumb that I'd thought I'd send out.
Use 1 amp for every thousandth of an inch plate thickness up to 200 amps.
Wire diameter for different gauges of steel:
<1/16 .023-.030
1/16 - 3/16 .030-.035
>1/8 .035-.045
Starting current for different wires sizes:
.023 60A
.030 90A
.035 110A
.045 150A
If you know the current, you can roughly work out the wire feed speed:
.030 Amps X 2.5
.035 Amps X 1.5
1/16 Amps X 1
They don't give an additional entry for .023, but I'd imagine it would
be in the 3-4 X Amps range.
These are all starting points and have to be adjusted to the work at hand.
In particular, current is not a linear function of wire speed (it's
exponential), but it's a useful apporoximation below 150 Amps.
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