Which is an advantage of using DCEN in TIG welding?

• A. Faster welding with less heat
• B. Deep penetration and concentrated arc
• C. Cleaner weld with less filler
• D. Low arc stability

Answer: (B)

Concentrating heat where it’s needed is the main idea here. In TIG welding, Direct Current Electrode Negative means the electrode is the negative terminal, so heat flows mainly into the workpiece rather than the tungsten. That concentrates the arc and pushes heat deeper into the base metal, giving deeper penetration and a tighter, more focused arc. This combination is especially useful when you want a strong root fusion in thicker sections. The electrode stays cooler, which helps control the process and reduces tungsten wear. So the best choice highlights deep penetration and a concentrated arc.

The other statements don’t fit this behavior: DCEN doesn’t inherently weld faster with less heat, cleanliness or reduced filler aren’t guaranteed by polarity alone, and arc stability isn’t typically described as low with DCEN.