4.5 Article

The characteristics of dynamic stability in aluminium alloy keyhole weld pool flow

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Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2023.2252638

Keywords

Keyhole welding; Molten metal; Flow mechanism; Fluid flow; Characteristic extraction; Destabilisation; Aluminium alloy

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The keyhole welding process in Variable Polarity Plasma Arc Welding significantly improves weld quality, but introduces pool instability. Investigating molten metal flow within keyholes reveals convergence and separation points, which induce weld pool instability. Increases in keyhole area and reduction in pinch angle reflect pool instability. These findings provide a theoretical basis for weld control and advance vision-based intelligent manufacturing welding techniques.
The keyhole welding process in Variable Polarity Plasma Arc Welding enhances weld quality significantly, yet it introduces pool instability. Dynamic stability is pursued by investigating molten metal flowing within keyholes and their characteristics. Weld pool flow patterns are obtained via particle tracking, while instability characteristics are captured employing a high-speed camera. Analysing directional molten metal flow unveils Convergence and Separation Points in weld pool flow. The latter's displacement induces weld pool instability, resulting in an increase in keyhole area and a reduction in the pinch angle. The keyhole area signifies pool instability, while the rear wall angle reflects the welding state. These findings provide a theoretical basis for weld control and advance vision-based intelligent manufacturing welding techniques.

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