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Зварювання та споріднені технології для відновлення України: Тези допов. конф. під ред. О.Т. Зельніченка. Київ, ТОВ «Видавничий Дім «Патон», 2025, с. 21-21

Features of increasing penetration in high-frequency pulsed tig welding of carbon and stainless steel (experimental studies)

Kovalenko Dmytro1, Krivtsun Igor1, Biber Alexander2, Mokrov Oleg2, Pavlov Oleksii1

1ІЕЗ ім. Є.О. Патона НАН України. 03150, м. Київ, вул Казимира Малевича, 11.
2ISF – Institut für Schweißtechnik und Fügetechnik (Welding and Joining Institute), RWTH Aachen University, Aachen, Germany

The TIG welding process using high-frequency modulation of the welding current is one of the methods for controlling and increasing the penetration of the weld metal. The description of the developed at PWI module of high-frequency modulation of welding current as applied to TIG welding is presented. The module provides independent regulation of the current pulse frequency f in the range of 4–12 kHz, the duty cycle D = tp/T in the range of 0.3–0.7, the maximum pulse current Ip and mean current Imean to values lying in the range of 100–290 A and 50–150 A, respectively. The methodology and results of experimental studies of the characteristics of high-frequency pulsed TIG welding of carbon (S235 in 10 mm thick) and stainless (1.4301/AISI 304 in 5, 6 and 8 mm thick) steels are presented. It is shown that no influence of material and welding frequency on current rising speed visible. Current drop speed for all frequencies identical (function of the current). As the welding frequency increases, the pulse shape changes from trapezoidal to triangular. The module that stores and releases electrical energy, acting like a capacitor. It has been established that the penetration depth depends on the current pulse frequency. In this case, regardless of the type and thickness of the steel, the maximum penetration depth is achieved at a frequency of 6 kHz, which corresponds to an increase in the penetration depth compared to DC welding of up to 40 % for stainless steel in 5 mm thick.

Features of increasing penetration in high-frequency pulsed tig welding of carbon and stainless steel (experimental studies)

Kovalenko Dmytro1, Krivtsun Igor1, Biber Alexander2, Mokrov Oleg2, Pavlov Oleksii1

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