Porsche sheet metal is 20 gauge (.o40") . (Some of the panels for the late small cars run about 24 gauge, because they are tempered. You can't weld these.) For a butt-welded joint space the two pieces about 1/16 apart. Plan for about 20 to 40 amps depending on the circumstances. Do a spot weld about every 2 inches (again depending on the particular situation. This is to keep the panels from warping as you weld. After all this is done full weld between spots but skipp a few inches so the heat buildup is not concentrated.
However if you are welding 1/8 " sheet you will need a lot of amps. The rule of thumb is to start with the current equal to the thickness of the metal. 1/8" = 125 amps for starting out. i would estimate that you will need about 150 to 200 amps. Spacing the initial spot welds applies here too.
You would be much better off in practicing on 20 gauge metal so you can used to the tecniques with this gauge.
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