One of the most important aspects of TIG welding is understanding the difference between AC and DC welding modes.
These two current types determine which materials can be welded and how the welding arc behaves.
If you’re exploring equipment options, start by browsing our selection of TIG welders designed for professional fabrication:
DC TIG Welding
DC TIG welding is typically used for:
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mild steel
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stainless steel
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copper
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titanium
DC welding produces a stable arc and deeper penetration, making it ideal for many industrial welding applications.
AC TIG Welding
AC TIG welding is primarily used for aluminum and magnesium.
The alternating current helps remove the oxide layer that forms on aluminum surfaces, allowing the weld puddle to properly form.
Fabricators working with aluminum usually rely on AC/DC capable machines like Lincoln TIG welders.
Choosing the Right Machine
If your work involves multiple metals, an AC/DC TIG welder provides the most flexibility.
Many fabricators researching machines start with guides like Best TIG Welder for Aluminum, which explains what features to prioritize.
Final Thoughts
Understanding AC and DC TIG welding helps welders select the right machine and settings for their projects.
Explore our full lineup of TIG welding machines to find professional equipment for aluminum, stainless steel, and steel welding.