Analysis of an arc light mechanism and its application in sensing of the GTAW process

P. J. Li, Y. M. Zhang

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Sensing plays a key role in automating and controlling welding processes. In recent decades, arc light sensing has been studied for arc length control, joint tracking and droplet transfer detection in arc welding. However, the current technology relies on experimental data and lacks theoretical foundation. To improve measurement accuracy, this work addresses the theoretical foundation for arc light sensing. A theoretical model has been developed to correlate arc light radiation to welding parameters. Distributions of different 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 can 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 tungsten arc welding. The relationship between the argon lines and the welding parameters has been derived from the theoretical model. Joint tracking examples showed the effectiveness of the developed method in improving accuracy.

Original languageEnglish
Pages (from-to)252-s
JournalWelding Journal (Miami, Fla)
Issue number9
StatePublished - Sep 2000

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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