Abstract
According to the current real-time quality inspection requirements for welding processes, the electrical signals in double-pulse variable polarity gas tungsten arc welding (VP-GTAW) welding process of 2219 aluminum alloy were collected. The characteristics of steady-state and non-steady-state signals of the welding process were studied. The Hilbert-Huang transform based on empirical mode decomposition was applied to analyze the stability of double-pulse VP-GTAW. Fast Fourier Transform (FFT) spectrum and Hilbert spectrum of the intrinsic mode functions were obtained, and the stability of the welding process was studied. The relationship between the welding signal of the welding process and the weld formation was established, as the welding process becomes unstable, the time-frequency entropy of the welding process increases.
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