Journal
MEASUREMENT
Volume 46, Issue 1, Pages 272-278Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2012.06.014
Keywords
Square wave alternating current submerged arc welding; Arc stability; Quantitative indicator; Largest Lyapunov exponent
Funding
- National Natural Science Foundation of China [51005073]
- Hunan Provincial Natural Science Foundation of China [11JJ2027]
- Project of Hunan Provincial Research Scheme [2011GK3052]
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Based on the experimental non-linear time series of welding current produced by Square Wave Alternating Current Submerged Arc Welding (SW AC SAW) at different frequency and duty cycle, the largest Lyapunov exponents of the welding system are numerically evaluated by the phase space reconstruction technique and the improved small-data method algorithm. The experimental and calculated results show that the largest Lyapunov exponent can describe the arc stability as a quantitative indicators at the process of Square Wave AC SAW. Further analysis proves that when the duty cycle of welding current is 0.5, the largest Lyapunov exponent reaches small values and the welding processes approach high steady states. When the welding current frequency is larger, the largest Lyapunov exponent reaches small values and the welding processes approach high steady states. When the welding current frequency is smaller, the system is at the unsteady mode and the largest Lyapunov exponent attains large values. Therefore, the welding current frequency is negatively correlated with the welding process stability. (C) 2012 Elsevier Ltd. All rights reserved.
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