What is the rule of thumb for estimating GTAW stickout?

• A. 1 to 2 electrode diameters
• B. 2-1/2 to 3 times electrode diameter
• C. equal to the cup diameter
• D. 3/4 times cup diameter

Answer: (A)

In GTAW, stickout is the distance from the tip of the tungsten electrode to the workpiece where the arc forms. The common rule of thumb is to keep this distance about one to two times the electrode diameter. This length provides a stable, controllable arc and sufficient heat focused into the weld pool while minimizing tungsten contamination of the weld and excessive shielding gas loss. If the stickout is too short, you risk tungsten inclusions or an unstable arc; if it’s too long, the arc becomes harder to control, shielding efficiency drops, and heat placement becomes less precise. Using a length equal to the cup diameter or extending several times the electrode diameter would typically degrade arc stability and shielding effectiveness. So, sticking to roughly one to two electrode diameters gives a practical balance for most GTAW setups.