Quote:
Originally Posted by DannoXYZ
Welding is really only way to join aluminium reliably with strength. While you can TIG weld alloy with reverse-polarity DC (cheaper machine), it's A LOT easier with high-frequency AC unit.
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You're right that AC is best for welding aluminum, but the HF is for starting the arc. The welding current comes from much lower frequency AC, often 60 Hz in the US, but with inverter units it can be variable in a range from very low to a couple hundred Hz.