Novel stability evaluation for short circuiting transfer based on features of input power

Abstract

An experimental platform of carbon dioxide arc welding, which is used to measure input and output electrical signals, is established. On the basis of input signals, an algorithm for instantaneous input power is introduced. By analysing the waves of instantaneous input power and output current, it is found that the peak of pulsating input power (PPIP) and the pulsating input energy (PIE) are basically consistent with the variation trend of the output current. hort circuiting transfer frequency, coefficient of variation for PPIP and coefficient of variation for PIE are calculated based on the input power characteristics with different wire feedrate . As a result, it shows that all of them can be used to evaluate the stability of short circuiting transfer process. In addition, the optimum method for evaluating the stability is identified, according to comparison of the Pearson correction coefficients, and the results demonstrate that the short circuiting transfer frequency is the best.

Stability Analysis of Metal Active-Gas Welding Short-Circuiting Transfer Based on Input Pulsating Energy

“…The input side runs simultaneously with the capacitor C and the arc load power supply, at this time diode D1, D6 conduction; that is, iU = iin, iW = −iin, iV = 0, corresponding to the current wave at about 5 ms in Figure 5. Therefore, the instantaneous input power Pin is calculated from the input voltage and input current [17] as follows. Therefore, the instantaneous input power P in is calculated from the input voltage and input current [17] as follows.…”

“…Therefore, the instantaneous input power Pin is calculated from the input voltage and input current [17] as follows. Therefore, the instantaneous input power P in is calculated from the input voltage and input current [17] as follows.…”

“…A calculation of the input energy during each pulsation cycle T gives the input pulsation energy E P , which corresponds to the welding current as shown in Figure 7. Therefore, the instantaneous input power Pin is calculated from the input voltage and input current [17] as follows.…”

“…The parameters they selected were based on the output side, such as arc voltage and welding current, but the analysis of the input electrical signal of the welding machine was rarely covered. That was until Xiaoqing Lv and other researchers explored the connection between the input and output electrical signals of carbon dioxide arc welding and found that the short-circuiting transfer frequency of carbon dioxide arc welding calculated from the input pulsation energy and welding current maintains a consistent variation law [17].…”