How To Weld Aluminum With Dc Tig. TIG welding aluminum with a DC current leads to contamination. Beginning TIG welders often unintentionally produce a lot of scrap because they dont practice basic hand placement and control before striking an arc on the base material.
As said above the only way to weld aluminum and magnesium with the TIG process is on the alternating current. This page focuses on welding aluminum with a DC TIG welder electrode negative DCEN argon and flux. Although you wont have the finesse in controlling the front surface of the puddle like you can with AC TIG since youll have a layer of molten flux on the surface and so you wont.
When TIG welding aluminum make sure that all oxide compounds are burned away and the weld spot is perfectly shiny before introducing filler wire to prevent contamination.
Issues to Consider with TIG Welding Aluminum on DC. Issues to Consider with TIG Welding Aluminum on DC. The current type of aluminum welding should always be AC welding. DCEN should provide good penetration.