Abstract
The dynamic behavior of keyhole in plasma arc welding determines the weld quality. In this study, the keyhole images are observed during the process, and both the keyhole geometry and its position relative to the torch axis are determined. The deviation distance of the keyhole exit at bottom side of the workpiece from the torch centerline is used to describe the extent of keyhole inclination and is measured based on the captured sequential images of the keyhole exit. Experiments are conducted to study the dynamic variation of keyhole exit and its inclination extent. The interaction between the plasma arc and the molten pool and its influence on the keyhole inclination are analyzed. The results lay solid foundation for monitoring and controlling the thermal process in keyhole plasma arc welding.
Published Version
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