TIG Welding: How Does AC Clean Oxide Layer?

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SUMMARY

AC (Alternating Current) is essential for TIG (Tungsten Inert Gas) welding of aluminum due to its ability to clean the oxide layer on the surface. The cleaning action occurs through a process where the AC current alternates, allowing the oxide layer to be broken down and removed. This oxide does not vaporize but is instead disrupted and displaced, facilitating a cleaner weld. For metals with oxide layers that are not welded with AC, mechanical or chemical removal methods are recommended prior to welding.

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patshek
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Hello,
I know AC is used for welding of Aluminum or materials that have oxide layer on the surface
Books also tell me that the oxide layer is cleaned by AC
However, what is the exact mechanism of this cleaning action? Besides, where does the oxide gone? Vaporized? Dissolved?
Thanks
 
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