A plasma cloud charge sensor for pulse keyhole process control

Y. M. Zhang, S. B. Zhang, Y. C. Liu

Research output: Contribution to journalArticlepeer-review

87 Scopus citations


Keyhole plasma are welding achieves much deeper penetration than do all other existing are welding processes. Because of its ability to penetrate thicker material, the control of the keyhole in plasma are welding becomes critical. From an analysis of the physical process, a sensor to detect the state of the keyhole for keyhole process control has been proposed and developed. This sensor measures the electrical effect of the plasma cloud generated during keyhole plasma are welding. It is found that the plasma cloud, which rapidly decreases to zero upon establishment of the fully penetrated keyhole, can be used to detect the state of the keyhole reliably. The effectiveness of the proposed sensor for detecting the keyhole state has been verified during pulse keyhole plasma are welding.

Original languageEnglish
Pages (from-to)1365-1370
Number of pages6
JournalMeasurement Science and Technology
Issue number8
StatePublished - Aug 2001


  • Arc
  • Plasma
  • Welding

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics


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