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.
AC Versus DC Steel TIG Welding Choice: Which Current Delivers the Best Results for Your Steel Project
However, the lower penetration of AC on thin material requires careful torch angle and speed. This flexibility is what makes AC balance such a powerful tool for professional welders tackling varied steel projects.
The Case for DC Current on Steel When working with mild steel or low-alloy steel, DC negative (DCEN) is often the preferred choice. Understanding the Fundamentals of Current Flow To decide between AC and DC, it is essential to first grasp how these currents interact with the tungsten electrode and the metal itself.
AC Versus DC Steel TIG Welding Choice
For thicker sections, the high penetration of DC negative allows you to create a strong root pass without the risk of burning through, provided the joint preparation is correct. Ideal for building up layers or welding in tight spaces.
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