Frequently Asked Questions
For materials, such as aluminium, which has a tenacious oxide film on the surface, AC power must be employed. By switching between electrode positive and electrode negative polarity at typically fifty times a second, the periods of electrode positive will be sufficient to remove the oxide and clean the surface, Fig.1.
Extracted from an article entitled 'Let's get technical - choosing an arc welding power source' by W Lucas and G Melton, published in Welding & Metal Fabrication, Vol.67, No.4, May 1999, pp.18-21. (Publishers - dmg BusinessMedia Ltd, Redhill, Surrey, UK - http://www.dmg.co.uk/dmgbm/)
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