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A Study on the Quality Estimation of Resistance Spot Welding Using Hidden Markov Model  

김경일 ((주)아이엠티)
최재성 ((주)아이엠티)
Publication Information
Journal of Welding and Joining / v.20, no.6, 2002 , pp. 769-775 More about this Journal
Abstract
This study is a middle report on the development of intelligent spot welding monitoring technology applicable to the production line. An intelligent algorithm has been developed to predict the quality of welding in real time. We examined whether it is effective or not through the In-Line and the Off-Line tests. The purpose of the present study is to provide a reliable solution which can prevent welding defects in production site. In this study, the process variables, which were monitored in the primary circuit of the welding, are used to estimate the weld quality by Hidden Markov Model(HMM). The primary dynamic resistance patterns are recognized and the quality is estimated in probability method during the welding. We expect that the algorithm proposed in the present study is feasible to the applied in the production sites for the purpose of in-process real time quality monitoring of spot welding.
Keywords
Intelligent spot welding monitoring; Primary circuit; Dynamic resistance patterns; Hidden markov model (HMM); Real time quality monitoring;
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