Welding Aluminum With Tig Ac Or Dc. In a TIGs case aluminum is always welded with AC current because of a special property of aluminum alloy that has a problem with melting point. The most common reason to try DC power on Aluminum is a situation when the metal is thick usually thicker than ½ in most cases.
When your TIG machine has an ACDC switch AC is the way to go for welding aluminum. There is a welding forum here. For proper welding you need both AC and DC Currents.
Choose the Right TIG Welding Application for DC Power.
One of the things that makes welding aluminum different than welding steel is Aluminums oxide layer. Ad Find China Manufacturers Of Aluminum Welding. AC or DC on Aluminum Lets get to the vital part of figuring out which current type is better for TIG welds in aluminum. Turning on the pulse is as easy as setting the pulses per second from 01 - 2 Hz getting that penetration and filler rod consistency you have been after without even thinking about it.