Electric heating – Metal heating – For bonding with pressure
Patent
1983-05-25
1985-01-15
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
2191171, B23K 1100
Patent
active
044939655
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.
An edge weld geometry is detected by calculating from the resistance and power curves the weld energy during the period of expulsion, if any, divided by the cumulative energy between the onset of melting and the end of expulsion, a measure of expulsion intensity based on the maximum degree of resistance inflection, and then a weighted sum of the energy value and the inflection value.
REFERENCES:
patent: 3518399 (1970-06-01), Vanderhelst
patent: 3582967 (1971-06-01), Beckman et al.
patent: 3609285 (1971-09-01), Scarpelli
patent: 3746829 (1973-07-01), Petzold
patent: 4024371 (1977-05-01), Drake
patent: 4343980 (1982-08-01), Stanya et al.
patent: 4376242 (1983-03-01), Buff et al.
Cleveland Dixon
Decina, Jr. Basil A.
Havens James R.
Houchens Albert F.
Nagel Gregory L.
General Motors Corporation
Hill Warren D.
Shaw Clifford C.
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