Chaos and Fractal Characteristics of Electrode Displacement Signals in the Spot Welding

An arc stability evaluation approach for SW AC SAW based on Lyapunov exponent of welding current

“…The largest Lyapunov exponent has been also gradually applied to the field of welding. Based on Lyapunov exponent, Luo calculated and analyzed chaos characteristics of electrode displacement signals in spot welding process [14], and Cao described stability of carbon dioxide gas metal arc welding (CO 2 GMAW) with short circuit transfer [15,16]. However, the current studies of Lyapunov exponent in welding field were only used to initially determine the chaos existed in the arc welding process, which did not be used to quantitatively research (evaluation and measurement) the relationship between arc stability and welding process parameters.…”

Effect of Laser Power on Stability of Laser-Twin-Wire Hybrid Welding Process

“…Non-linear time series processing method is an important mean for quantifying chaotic degree, which has been widely used in some bio-medical, non-linear electronics and mechanical engineering fields but very few applications on welding manufacture monitoring and evaluation. Luo calculated and analyzed chaos characteristics of electrode displacement signals in spot welding process 4 , and Cao described stability of carbon dioxide gas metal arc welding with short circuit transfer [5][6] . However, these studies of Lyapunov exponent were only used to certify there is chaos existing in the arc welding process.…”