A study on spot welding quality judgment based on hidden Markov model

Aiming at the influencing factors of spot welding quality and the shortcomings of the method of judging the spot welding quality based on the monitoring waveform curves: it is impossible to deeply analyze the differences between the corresponding monitoring waveform curves and spot welding qualities. In this study, according to the monitoring waveform curves of the welding current, inter-electrode voltage, electrode pressure and other signals when the spot welder executes the process parameters, by establishing the HMM model to realize the judgment of spot welding quality. The proposed method was also applied to the experiments of spot welding quality judgment for verifying the algorithm effectiveness.