Efflux plasma charge-based sensing and control of joint penetration during keyhole plasma arc welding

S. B. Zhang, Y. M. Zhang

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Keyhole plasma arc welding (PAW) is a promising technology for precision joining of metals. To develop an accurate penetration feedback control system, the space charge voltage generated by the efflux plasma was measured to predict the back-side width of the weld pool, which relates to the state of joint penetration. The resultant empirical model showed a linear relationship between the space charge voltage and the back-side width of the weld pool. To design the control system, step-response experiments were done to estimate the transfer function of the welding process. Based on the transfer function, a Pl controller was designed. Experiments verified the effectiveness of the developed penetration control system.

Original languageEnglish
Pages (from-to)157s-162s
JournalWelding Journal (Miami, Fla)
Volume80
Issue number7
StatePublished - Jul 2001

Keywords

  • Joint penetration
  • Keyhole
  • Penetration control
  • Plasma arc
  • Sensor

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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