The invention discloses a method for evaluating resistance
spot welding spattering quantitatively in real time through
acoustic emission signal frequency spectrum. The method comprises the following steps that structure load
acoustic emission signals in the resistance
spot welding process are collected in real time, and a dynamic oscillogram of the signals is drawn;
acoustic emission signals of
welding spattering are extracted according to the dynamic oscillogram of the structure load acoustic emission signals in the resistance
spot welding process; the
frequency spectrum of the acoustic emission signals in the
welding spattering process is calculated, and a
spectrogram is drawn;
frequency spectrum lines with the frequency
ranging from 1800 HZ to 2600 HZ are extracted through a band-pass filter; the arithmetic mean value of three maximum peak values of the frequency spectrum lines with the frequency
ranging from 1800 HZ to 2600 HZ is calculated; according to the judgment rules of quantitative evaluation of the amount of
welding spattering, the larger the arithmetic mean value of the three maximum peak values of the frequency spectrum lines with the frequency
ranging from 1800 HZ to 2600 HZ is, the larger the amount of the spattering in the resistance spot
welding process is. Analytical calculation of the frequency spectrum can be carried out through both power spectrum and amplitude spectrum. Through the method for evaluating resistance spot welding spattering quantitatively in real time through the acoustic emission
signal frequency spectrum, the quantitative evaluation of the amount of spattering in the resistance spot welding spattering process can be achieved.