Evaluation Method of Usability of the Flux-cored

Wire in CO² Arc Welding

WANG Yong¹  WANG Bao²

(1. Institute of Welding Materials, Taiyuan University of Technology, Taiyuan 030024;
2. Training Center of Welding Consumables Technology, North University of China, Taiyuan 030051)

Abstract: Metal transfer behaviors of the flux-cored wire in CO² arc welding have a direct effect on usability of the flux-cored wire. These behaviors are indirectly showed in welding electric signals. Using the ANALYSATOR HANNOVER, welding electric parameters of the flux-cored wires in CO² arc welding are measured and analyzed. Four characteristic information values closely correlated with usability of the flux-cored wire are extracted, such as the sum of probability density of big short-circuiting current, frequency of short-circuiting transfer, frequency of brief short circuit and the sum of brief short-circuiting time, and then method of principal component analysis is applied to determining evaluation index of usability of the flux-cored wire. Usability of the flux-cored wire is quantitatively evaluated. Thereby it offers a new method for scientifically evaluating usability of the flux-cored wire.

Key words: Flux-cored wire  Usability of the flux-cored wire  Metal transfer  Principal component analysis  Evaluation method

CLC No: TG42

Received 20070331, received in revised form 20071012

References

[1] LI Zhuoxin, LI Huan, CHEN Banggu. Study on effects of droplet transfer on operation performance of self-shielded flux-cored wire[J]. Chinese Journal of Mechanical Engineering, 2000, 36(5): 66-68.
 [2] WANG Bao, YANG Lin, WANG Yong. Observation and analysis of metal transfer phenomena for flux-cored electrodes in CO2 arc welding[J]. Transactions of the China Welding Institution, 2006, 27(7): 77-80.
 [3] REHFELDT D, POLTE T. Three systems for process monitoring, process analysis and quality determination in arc welding[C]// Proceedings of International Conference on Joining of Materials JOM-9. Denmark, 1999: 277-283.
 [4] ZHANG Xiaonan, LI Junyue, HUANG Shisheng, et al. Statistical analyzing evaluation method of dynamic characteristic of CO2 arc welding power source[J]. Transactions of the China Welding Institution, 2001, 22(3): 12-16.
 [5] WU Chuansong, POLTE T, REHFELDT D. Kohonen network system for process monitoring in gas metal arc welding[J]. Chinese Journal of Mechanical Engineering, 2002, 38(1): 131-134.
 [6] HU Qingxian, WU Chuansong, SUN Junsheng, et al. Fuzzy pattern recognition of disturbing information in GMAW[J]. Transactions of the China Welding Institution, 2001, 22(6): 48-52.
 [7] YANG Lin, WANG Bao. Measurement and analyses of several kinds of flux-cored wires by HANOVER Analysator[J]. Welding Technology, 2004, 33(5): 39-41.
 [8] REHFELDT D, BOLLMANN A. Using statistical signal analysis for analyzing and monitoring GMAW- processes
[C]// Proceedings of the Symposium on Strategy of Welding Research in 2000 and Possible Aspects of China- Germany Cooperation. Beijing, China, 1991: 10-25.
[9] REHFELDT D, BOLLMANN A, KORBE T, et al. Computer-aided quality control by process analyzing, monitoring and documentation[C]// Joining/welding 2000, in the Hague, the Netherlands, 1991: 371-383.
[10] JOHNSON R A, WICHERN D W. Applied Multivariate Statistical Analysis[M]. 4th Ed.. LU Xuan, GE Yubo, ZHAO Hengxiu, et al, translation. Beijing: Tsinghua University Press, 2001.
[11] YUAN Zhifa, ZHOU Jingyu. Multivariate statistical analysis[M]. Beijing: Science Press, 2002.