Weld Pool Oscillation During Gas Tungsten Arc Welding

摘要

The oscillation behavior of Gas Tungsten Arc (GTA) weld pools in mild steels Fe360 and in austenitic stainless steel AISI 304 is considered. Special attention is given to the possibility of using the weld pool oscillation behavior as a sensor of weld pool geometry during welding, which is one of the objectives in adaptive control of the welding process. The topics discussed include the theoretical background of the oscillation phenomenon, the direct observation of weld pool oscillation, the experimental determination of the relation between the weld pool geometry and the oscillation frequency both under stationary arc conditions and under traveling arc conditions and the possibility of sensing the weld pool geometry, especially the weld pool penetration, by monitoring the oscillation frequency.