I highly doubt Puddles preheated any of the welds he showed. Heat travels through aluminum so fast just striking an arc preheats it. That's why they have foot pedals to control amperage. Turn it up to establish the puddle and turn it down to fill the crater. Aluminum takes a lot more amps to weld the same thickness as steel because it draws the heat away. Some aluminum is crack sensitive and you have to use a different technique to prevent cracks. It could be welding the ends first to add reinforcement, back step welding, etc.
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