Methodology of a quantitative assessment of welding and technological characteristics of covered electrodes

Abstract

The main parameters of the welding mode, which are traditionally used to assess the stability of mass transfer, are the duration of the short circuit of the arc gap (τs.c.., ms), the cycle duration - the period of formation and transfer of the drop (Ts.c., ms), current value (maximum - Imax and minimum - Imin, A); current rise rate (Vrise Iw. та Vdrop Iw., А/s). In addition, for example, in publication the authors propose to use as a criterion of stability the standard deviations of the duration of the short circuit (σ τs.c.) and their frequency (σ Ts.c.), while the authors of publications speak of rms deviation of the amplitude value of the current (σ Iw.), short-circuit current (σ Iw.mах) and the coefficient of variation of the rate of increase in the short-circuit current (Kv Iw.mах). Thus, there is no single standardized methodology for determining the stability of the welding process and the choice of research methodology depends on the parameters of the object of study.