Dale Watney Phones & Addresses
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Franklin, TN
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114 Long Valley Rd, Brentwood, TN 37027 (615) 373-4998
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Troy, MI
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Detroit, MI
Publications
Us Patents
Method And Apparatus For Predicting And Controlling The Quality Of A Resistance Spot Weld
View pageUS Patent:
44939655, Jan 15, 1985
Filed:
May 25, 1983
Appl. No.:
6/498061
Inventors:
Albert F. Houchens - Rochester MI
Dixon Cleveland - Vienna VA
Basil A. Decina - McLean VA
Dale K. Watney - Troy MI
James R. Havens - Sterling Heights MI
Gregory L. Nagel - Royal Oak MI
Dixon Cleveland - Vienna VA
Basil A. Decina - McLean VA
Dale K. Watney - Troy MI
James R. Havens - Sterling Heights MI
Gregory L. Nagel - Royal Oak MI
Assignee:
General Motors Corporation - Detroit MI
International Classification:
B23K 1100
US Classification:
219109
Abstract:
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, R is calculated and stored and the function is divided by power P to obtain R/P. The resistance curve is searched to obtain the maximum value R. sub. m which occurs during the heating phase and the function R/P is searched prior to the time of R. sub. m to find the maximum of that curve representing the highest rate of resistance increase. Then the R/P curve is searched subsequent to its maximum to determine when the function reaches a specified percentage of the maximum. That value occurs at the knee of the resistance curve and approximates the onset of melting in the weld. A prediction of whether a weld is a nugget or a sticker is made by calculating the ratio of weld energy after the onset of melting to the total weld energy, the ratio of the resistance drop after the resistance peak to the peak resistance, and then a weighted sum of the energy ratio and resistance drop ratio.