Spot welding

[ROBERT SUGGITT <rsuggitt@bmts.com>]

        My wonderful wife gave me a Miller 110 volt hand held spot welder for 
Christmas. I now need to buy the tongs. Anyone have any experience using 
one?  I was interested in the gauges of metal that could be joined using 
the  standard tong lengths of  12 and 18 inches.  The owners manual is 
mostly useless, specifying only that the maximum thickness (using the 6 
inch tongs) is 0.125 inch (or 2 X 16 gauge).  Also any suggestions on how 
many seconds it might take to complete  welds for the various gauges?

Rob