Method and apparatus for detecting edge welds during resistance spot welding
CA 1192956 A · Owner: General Motors Corporation · Inventors: Jenuwine, William C.; Cleveland, Dixon; Decina, Basil A. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure During a weld period the weld parameters are monitored and data representing the weld resistance curve and the power curve are acquired and stored for analysis by a suitably programmed computer. The derivative of R, ? is calculated and stored and the function is divided by power P to obtain ?/P The, resistance curve is searched to obtain the maximum value Rm which occurs during the heating phase and the function ?/P is searched prior to the time of Rm to find the maximum of that curve representing the highest rate of resistance increase. Then the ?/P curve is searched subsequent to its maximum to determine when the function reaches a specified percentage of the …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 3, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 2002.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.