Originally Posted by rivergrunt
Can you pre-heat before using spool gun to get good penetration?
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Ive never tried aluminum on a spool gun but I would think this would be very difficult if at all possible. And what would you use for preheat? Nothing is as efficient as the arc itself. The beauty of tig is you control all the variables - preheating, arc, power, feed rate, etc. Since Aluminum draws heat away from the weld puddle so effectively you need to be able to tweak the process on the fly. As a what I consider a beginner (not enough hours or practice) , I often find myself doing shorter weld runs, then walk away and wait for the metal to cool to initial conditions.