ANALYSIS OF ELECTRICAL PARAMETERS OF THE WELDING ARC IN ARGON WITH TUNGSTEN ELECTRODE AND FLUX-OXIDES
In order to identify the influence of metal oxides on the characteristics of DC-welding arc in argon with a non-consumable electrode we analyzed the oscillograms of electrical parameters in the time and spectral range - voltage and welding current, obtained in welding austenitic steel 12X19H9T with the oxides Al2O3, CuO, Fe2O3, CaO, CuO, ZnO, TiO2 and Cr2O3. The standard deviation of welding current and voltage was used as a criterion of arc burning stability in the time domain. In the spectral region, discrete Fourier transform was used to analyze the process. Investigated fluxes were ranked according to their influence on arc discharge stability. Characteristic harmonic components of welding current spectrum of traditional process of welding with nonconsumable electrode in argon and welding with the use of some oxides have been determined. It was established that aluminum oxide causes the least disturbance of the arc, and calcium oxide СаО and manganese dioxide have the most disturbing influence on the welding process. The instability of the welding process when using some oxides was associated with the detected changes in the spectrum of electrical parameters.