“…Many studies are devoted to investigation of the processes of TIG welding with arc current modulation . Modes with low-frequency (modulation frequency f ≤ 50 Hz) [3,5,6,8,9,11,15,25,30], medium-frequency (f ~ 5 kHz) [2, 4-9, 15, 17] and high-frequency (f > 10 kHz) [2, 5, 6, 10, 13-15, 17, 20-24, 27-29] with pulse current modulation were experimentally studied. Works [7, 11, 12, 16, 18, 19, 24, 26-29, 31, 32] are devoted to theoretical study and mathematical modeling of TIG welding by modulated current.…”