Conversely, AC alternates direction thousands of times per second, creating a cleaning action that removes surface contaminants but offers less concentrated heat. In DC welding, the electron flow moves in a single, constant direction.
AC vs DC TIG Welding Steel: Strength and Performance Differences
The alternating current provides the cleaning action necessary to break up the oxide layer that can form on steel, especially when it has been exposed to high temperatures or stored in humid environments. AC is the standard for welding aluminum and magnesium, but it is also beneficial for certain steel applications, particularly when surface preparation is critical.
Welding reactive alloys that may form an oxide layer. Material Thickness and Joint Design The physical properties of the workpiece should heavily influence your choice of current.
AC DC TIG Welding Steel Strength Compared
This setting provides excellent penetration while keeping the tungsten electrode cool, which results in a stable arc and a narrow, concentrated weld bead. Shifting the balance toward penetration mimics DC behavior, providing deeper fusion while still benefiting from the cleaning phase.
More About Ac or dc for tig welding steel
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