Evolution of cathode surface morphology and distribution of oxides during TIG welding L. Belgacem1,∗, S. Benharat1, M. Hakem1, M. Sakmeche2 1 Research centre in industrial technologies - CRTI- Cheraga-Algiers- Algeria 2 Department of Hydrocarbons and Renewable Energies,University of Adrar- Algeria ∗ l.belgacem@crti.dz Keywords: TIG, electrode, tungsten, cathode. The high quality of TIG welds as well as their good appearance, is owing to non-consumable tungsten electrode which allows to precisely direct the arc. The succession of welding operations leads to a change in the morphology of the electrode tip [1,2] which affects the stability of the arc plasma and consequently the welded product quality. In this work, the effect of the type of current arc on the oxides behavior inside of the electrode and its impact on the morphology of its surface was analyzed. Following the experimental results obtained, it was found that the DC generates a considerable degradation of the electrode while it is better preserved by applying a pulsed current. References [1] Liu, Z., Fang, Y., Chen, S., Zhang, T., Lv, Z., Luo, Z. (2019). Focusing cathode tip characteristics in cooling tungsten. Energy, 167, 982-993. [2] Tanaka, K., Yamada, T., Shigeta, M., Tanaka, M., Nakabayashi, S. (2019). The electrode reletion between electrode lifetime and additive consumption during TIG welding. Welding letters37, 4-6 95
RkJQdWJsaXNoZXIy MjM0NDE=