Aluminum is hard to weld, it gives no indication it is about to fall through or blow out from heat. Steel turns cherry red before it blows out. Aluminum takes a lot of practice to put enough heat and not blow through.
One thing I learned the hard way is that the tungsten has to be VERY clean. I sharpened a tungsten on a grinding wheel reserved for tungstens, and after some of my welds werent right. All my welds I tested failed. Some jackass ground some edges of sheet metal that was galvanized on that wheel earlier and contaminated my tungsten. That is all it took to ruin my welds. I had to seriously resurface the wheel and grind a whole bunch of my tungsten off. Clean base metal, clean rods, clean tungsten and plenty of argon are the keys.
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