Response of the welding power source in pulsed TIG welding of stainless steel
This research analyses the influence of welding parameters in pulsed TIG welding on the electrical response of the welding power source, and consequently on heat input and weld geometry. In the experiment, we varied pulse frequency and the proportion of base current. By measuring welding current and arc voltage, we analysed the response of welding power source, determined heat input, and examined weld geometry. The results show that, particularly at higher pulse frequencies, the welding power source fails to follow the intended pulse shape and fails to achieve set values of welding current. This directly affects heat input and weld geometry. Increasing pulse frequency up to 5 kHz results in higher weld penetration depths and weld width, mainly due to higher heat input.