DETERMINING KEYHOLE STABILITY FOR PLASMA ARC WELDING PROCESS CONTROL

Shaobin Zhang, Yu Ming Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Stability of the keyhole plays a fundamental role in producing quality welds in keyhole plasma arc welding. Currently, keyhole size is assumed to be a measurement of its stability. To verify this idea, keyhole and weld pool were simultaneously imaged from the opposite side of the welding torch. Experimental results revealed that the width of the keyhole was not correlative with the stability of the keyhole: as long as the keyhole mode was maintained, the width remained constant despite the changes in the welding current and speed. However, it can be used to estimate the lower limit of the pool width for preventing keyhole collapse. Also, the upper limit of the pool width for preventing bum-through is approximately fixed for given applications. Hence, in this sWdy, pool width, its upper limit, and keyhole width were used to determine the margins of the process from collapse and bum-through. To measure the state of the stability of the keyhole process, the stability distance and stability factor were proposed. Based on the imaging system used, the state of the stability can be monitored in real-time.

Original languageEnglish
Title of host publicationManufacturing Science and Engineering
Pages123-129
Number of pages7
ISBN (Electronic)9780791816462
DOIs
StatePublished - 1999
EventASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999 - Nashville, United States
Duration: Nov 14 1999Nov 19 1999

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume1999-U

Conference

ConferenceASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999
Country/TerritoryUnited States
CityNashville
Period11/14/9911/19/99

Bibliographical note

Publisher Copyright:
© 1999 American Society of Mechanical Engineers (ASME). All rights reserved.

ASJC Scopus subject areas

  • Mechanical Engineering

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