Investigation of TIG-welding plasma and the electrode contamination

摘要

TIG welding experiments have been used for the welded joints of the austeniticudstainless steel and molybdenum. The aim of the experiments was to find the optimal weldingudparameters. The problems that occurred throughout the welding process were due to the veryudhigh melting point of the Mo. Also, using optical microscopy and scanning electronudmicroscopy have performed a proper testing in parallel with the experiments. Regarding toudthe wear of electrode, there have been determined the tip angle, the tapering and the effect ofudthe electrode’s material composition. The latter parameter was investigated for thorium-oxideudand lanthanum-oxide alloyed electrodes.