For sheet metal I was used the same sized tungsten as the metal thickness. So much easier and less burn through, better heat control and less distortion that way. Cup size I used small to save of gas and you only have a small weld pool to protect.
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Marcus
aka. Gojeep
Victoria, Australia
http://willyshotrod.com
Invention is a combination of brains and materials.
The more brains you use, the less materials you need.
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