How To Weld Aluminum On Dc. Part 1 TIG Time - YouTube. The oxide is essentially formed when metal is exposed to air and it has much higher melting point of about 3600-degree F.
When your TIG machine has an ACDC switch AC is the way to go for welding aluminum. The welder holds the electrode over the workpiece and melts it by striking up the arc while continuously feeding a filler rod or consumable to the weld pool. The preferred method is AC because people do not know what they are doing when it comes to aluminum DC plain and simple.
Choosing a gun and wire feeding system is an important step before MIG welding aluminum.
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. Stick welding Aluminum polarity. Choose the Right TIG Welding Application for DC Power. Clean your aluminum remove any oxide and file the edges that will be joined.