How does a lift start initiate an arc?

A lift start initiates an arc by pressing the tungsten electrode against the workpiece and then pulling it away. This method relies on the physical contact that creates a localized arc once the tungsten has been retracted away from the surface. When the electrode is moved away, the gap between the electrode and the workpiece becomes narrow enough for the electrical current to jump across, thus establishing the arc necessary for welding.

This technique is particularly useful in situations where high-frequency starting is not desired or cannot be used. It provides a straightforward and effective way to start welding without the complications or additional equipment that high-frequency methods require. This method is often favored in environments where the welding conditions may interfere with equipment designed to generate high-frequency signals.