TIG Welding: How Does AC Clean Oxide Layer?

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AC welding is essential for aluminum due to its oxide layer, which must be cleaned for effective welding. The cleaning action of AC occurs through a process where the alternating current helps break down the oxide layer, allowing for better metal fusion. The oxide is typically vaporized or dissolved during this process, facilitating a cleaner weld. While AC is effective for aluminum, other metals with oxide layers may require mechanical or chemical removal methods before welding. Understanding these mechanisms is crucial for successful welding practices.
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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