The electric arc used in welding is a high current discharge sustained through a thermal ionized gaseous column, restricted to a small region in space. It is characterized by high temperatures, in a wide range of electromagnetic radiation, heavy material flow and important variations of physical properties. The analysis of the phenomena involved in the arc is complex but of major interest, since it is the primary source of energy in welding. The electric arc used in fusion welding has been studied for more than 50 years, but to this day, the phenomena involved are still not totally clarified. For instance, heat losses to the atmosphere are well known to influence the efficiency of the process, but its influence on the arc voltage is not clear (arc voltage can be understood as the electrical energy potential to sustain the column in regards the process of ionization and deionization). Simulation and modeling have been contributing to a better understanding of arc phenomena, nevertheless experimental observation is always needed, not only to confirm results, but also as a means to clarify and prove concepts.The present paper aims to analyze the influence of heat flow to the atmosphere around an electrical arc on the arc voltage, by using two different approaches based on experimental observation.
|Title of host publication||research welding school|
|Publication status||Published - 1 Jan 2012|
|Event||2nd Research Welding School - |
Duration: 1 Jan 2012 → …
|Conference||2nd Research Welding School|
|Period||1/01/12 → …|