Analysis of an are light mechanism and its application in sensing of the GTAW process - A theoretical model was developed that correlates arc light radiation with welding parameters
Pj. Li et M. Zhang, Analysis of an are light mechanism and its application in sensing of the GTAW process - A theoretical model was developed that correlates arc light radiation with welding parameters, WELDING J, 79(9), 2000, pp. 252S-260S
Sensing plays a key role in automating and controlling welding processes. I
n recent decades, arc light sensing has been studied for arc length control
, joint tracking and droplet transfer detection in arc welding. However, th
e current technology relies on experimental data and lacks theoretical foun
dation. To improve measurement accuracy, this work addresses the theoretica
l foundation for arc light sensing. A theoretical model has been developed
to correlate are light radiation to welding parameters. Distributions of di
fferent radiant sources in the arc column are studied. It is found that the
distributions of the ions of the shielding gas and the vapors of the base
metal and tungsten are not even, while that of the shielding gas atoms is.
This suggests the spectral lines associated with the shielding gas atoms ca
n be used to improve the accuracy of arc light sensing. Hence, an arc light
sensor has been developed to detect argon atom spectral lines in gas tungs
ten are welding. The relationship between the argon lines and the welding p
arameters has been derived from the theoretical model. Joint tracking exam
pies showed the effectiveness of the developed method in improving accuracy
.