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.
|Title of host publication||Manufacturing Science and Engineering|
|Number of pages||7|
|State||Published - 1999|
|Event||ASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999 - Nashville, United States|
Duration: Nov 14 1999 → Nov 19 1999
|Name||ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)|
|Conference||ASME 1999 International Mechanical Engineering Congress and Exposition, IMECE 1999|
|Period||11/14/99 → 11/19/99|
Bibliographical notePublisher Copyright:
© 1999 American Society of Mechanical Engineers (ASME). All rights reserved.
ASJC Scopus subject areas
- Mechanical Engineering