Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Capacitor discharge weld modeling using ultra high speed photography.

Authors
Wilson-RD; Hawk-JA; Devletian-JH
Source
Joining and adhesion of advanced inorganic materials symposium, April 12 - 14, 1993, San Francisco, California. Carim AH, Schwartz DS, Silberglitt RS, eds. Pittsburgh, PA: Materials Research Society, 1993 Sep; 314:151-162
Link
NIOSHTIC No.
10012200
Abstract
Capacitor discharge welding (CDW) is a rapid solidification joining process where high cooling rates (10(6) K/s) are obtained as a result of the large weld surface area to small weld volume. The objective of this study, directed by the U.S. Bureau of Mines and the Oregon Graduate Institute of Science and Technology, was to use ultra-high speed photography to quantify transient arc behavior during the CDW cycle. The simple cylindrical geometries of the CD welds have been used to formulate analytical models which are compared to the high speed photographs of the welding process. The high speed photographs were analyzed with respect to welding time and process weld variables and compared to predicted values from the analytical model. The detailed photographic analyses revealed that material is continuously ejected as a plasma from the weld area due to induced magnetic forces, rather than having the liquid metal squeezed out of the weld upon contact. It was found that welding time was controlled by tip length and drop height. Results from high speed photographs found the arc travel speed around tube welds to be 109m/s. Finally, the high speed photographs revealed that the velocity of arc propagation during ignition was fast enough to allow the CDW process to be modelled as one dimensional heat flow.
Keywords
Welding; Analytical processes
Publication Date
19930901
Document Type
Conference/Symposia Proceedings
Editors
Carim-AH; Schwartz-DS; Silberglitt-RS
Fiscal Year
1993
NTIS Accession No.
NTIS Price
ISBN No.
9781558992122
Identifying No.
OP 215-93
NIOSH Division
ALRC
Source Name
Joining and adhesion of advanced inorganic materials symposium, April 12 - 14, 1993, San Francisco, California
State
OR
TOP