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Mathematical Problems in Engineering
Volume 2014, Article ID 869631, 8 pages
http://dx.doi.org/10.1155/2014/869631
Research Article

Sample Entropy-Based Approach to Evaluate the Stability of Double-Wire Pulsed MIG Welding

1College of Electromechanical Engineering, Guangdong Polytechnic Normal University, Guangzhou 510635, China
2School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
3Department of Mechanical and Aerospace Engineering, Hong Kong University of Science and Technology, Hong Kong

Received 15 March 2014; Revised 9 May 2014; Accepted 9 May 2014; Published 3 June 2014

Academic Editor: Hamid Reza Karimi

Copyright © 2014 Ping Yao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

According to the sample entropy, this paper deals with a quantitative method to evaluate the current stability in double-wire pulsed MIG welding. Firstly, the sample entropy of current signals with different stability but the same parameters is calculated. The results show that the more stable the current, the smaller the value and the standard deviation of sample entropy. Secondly, four parameters, which are pulse width, peak current, base current, and frequency, are selected for four-level three-factor orthogonal experiment. The calculation and analysis of desired signals indicate that sample entropy values are affected by welding current parameters. Then, a quantitative method based on sample entropy is proposed. The experiment results show that the method can preferably quantify the welding current stability.