An analysis of volumetric radiation heat flux and experimental comparison with are light sensing in GTA welding process

The volumetric radiation heat flux was analyzed from a model of the entire free burning are of GTA welding and its results were compared with measurem ents of the are fight intensity to find a relationship between them. Experi ments were carried out for various welding currents using electrodes of dif ferent vertex angles. The results showed similar behavior for both the volu metric radiation heat flux and the light intensity of GTA welding are. Both presented a linear relationship with the logarithmic value of the are leng th. Consequently the are light intensity could be assumed to have a linear relationship to its radiation heat in the range of normal are length. (C) 2 001 Elsevier Science B.V. All rights reserved.