Electric heating – Metal heating – For bonding with pressure
Patent
1986-07-09
1987-09-15
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
219109, 2191171, B23K 1124
Patent
active
046941355
ABSTRACT:
A method and apparatus are disclosed for analyzing the dynamic resistance of a resistance spot welding process to determine the time of an expulsion event and use that time as the weld completion time for controlling weld termination via a weld feedback signal, controlling automatic current stepping, and identifying maintenance needs. A preconditioning pulse is used to stabilize the weld process and aid in obtaining interpretable resistance information. After an initial blanking period the resistance curve is analyzed by calculating first and second derivative values and applying several algorithms that make possible the computer recognition of characteristic resistance curve shapes resulting from weld expulsion under good geometry, bad geometry and edge weld conditions.
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Cleveland Dixon
Lee Anthony
Murty Balarama V.
Nagel Gregory L.
Sidlosky David M.
General Motors Corporation
Hill Warren D.
Shaw Clifford C.
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