Lift Arc Ignition
Lift-arc start is an ignition method in TIG welding where the electrode is briefly touched and the arc is struck as it is lifted. It prevents electromagnetic interference in the vicinity.
Physical-Chemical Mechanism
Lift-arc starting begins with a brief contact between the electrode and the workpiece to establish an electrical path. The arc is only established when the electrode is lifted, making the start more controlled.
Metallurgical Relevance & Welding Risks
This method prevents electromagnetic interference and improves control over the start. Improper use can lead to irregular arc heights, which can compromise weld quality.
Workshop Practice & Instructions
Use lift-arc starting when sensitive equipment is nearby. Make sure the electrode and the workpiece make brief contact, then lift to start the arc in a controlled manner. High control over the starting height is crucial.