Impact of the Samples’ Surface State on the Glow Discharge Stability in the Metals’ Treatment and Welding Processes

The low temperature plasma of glow discharge has found a widespread use as heating source in welding and surface treatment metals. meticulous analysis discharge’s instabilities these processes allowed us to highlight the physicochemical characteristics cathode (the welded or treated samples) one main reasons its transition into an electric arc—as more stable form gas discharges. prolonged arc action on samples surfaces inevitably leads disruption technological process and, consequently, undesirable overheating samples. In this regard, aim work is study influence macro- micro relief existence metals diffusion welding. It been analytically established experimentally supported that stability mainly affected by sharp protrusions generated because pre-treatment machining before rough with Rz about 60–80 µm decreases pressure range sustainable from 1.33–13.3 kPa 1.33–5.3 compared 10 µm.