"This crack I mentioned was on a b utt weld joint, not a crack that was in the aluminum before I received it. I still feel aluminum welds better if it is hot. A good example is the pictures that puddles posted."
When you talk about preheating and the next sentence is about about Puddles example, just about everyone will think that means Puddles preheated his pieces before welding. Puddles showed an example of an excellent TIG weld and why stick welding isn't used much for aluminum. He did say for some MIG machines, aluminum would benefit from preheating so you don't have a cold start. The original topic was regarding preheating thin aluminum for TIG welding.
Actually aluminum does get hot all over when you start welding. It's not magic though, it's the properties of aluminum and why aluminum wires aren't used in houses anymore and make poor welding cables. They heat up too quickly and won't carry as much current. That's why you need more amps to weld aluminum than the same thickness of steel. Take a torch and heat one end of a piece of aluminum and do the same thing on a similar piece of steel. The aluminum will get hot a lot further away from the heat source than the steel and it won't take long. You need to do more reading and less typing before you go into long debates trying to convince yourself you understand what's going on. It's no different when you couldn't understand why thieves would sell stolen welding cable to scrap yards instead of to welders.
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