By stating that an improved understanding of the physical mechanisms controlling process performance can usually be translated into higher levels of consistency and productivity for that process, it is expected to investigate these mechanisms. Among the various approaches for process physical characterisation, the electric-arc study unveils the process stability from the related phenomena. Specifically for arc welding, which high quality levels are required, the TIG process outstands. Further looking into this process, a parameter set calls the attention: 100-A current and pure argon as shielding gas. These values attribute to the arc special transitional characteristics, such as static characteristic, laminar-turbulent regime, arc dimensions and anode voltage fall. These characteristics are presented and discussed. From this discussion, a challenging for the Revista Soldagem & Inspeção readers is brought out. The idea is gathering their point of view and contributions with the objective of consolidating the knowledge on the electric arc in non-consumable process and, eventually, leading to technological results for a better process application.
Arc Physics; Transition; Electric Arc
