In DC TIG welding, how should the tungsten be ground to optimize arc start?

• A. Grind across to a point
• B. Grind to a point along the length of the electrode, not across
• C. Grind to a rounded tip
• D. No grinding needed

Answer: (B)

Concentrating current at the tip of the tungsten is what makes a reliable DC TIG arc start. Grinding the tungsten to a sharp point that tapers along the axis of the electrode creates a slender, aligned point at the very end. This focused, small contact area helps ignite the arc quickly and keeps it stable once it starts, which is essential for clean welding.

If you grind across to a point or leave the tip rounded, the current is less concentrated and ignition can be erratic or difficult, leading to poor arc starts or wandering. No grinding leaves a relatively blunt end with more surface area, which also hampers easy arc initiation.