Electric heating – Metal heating – For bonding with pressure
Patent
1989-01-19
1989-08-29
Shaw, Clifford C.
Electric heating
Metal heating
For bonding with pressure
2191171, B23K 1124
Patent
active
048619604
ABSTRACT:
This real time adaptive control and method of controlling a spot welding process compensates for electrode wear, oxidized surfaces, fit up variations and machine variations. Workpiece thermal growth is the measurement discriminant and the welding machine heat command is the control input. The control utilizes a least squares estimator to monitor the process and workpiece displacement, a precompensator to shape a desired displacement trajectory command, and a model reference control with a Smith-predictor to compensate for time delays and a proportional-integral-derivative compensator. The model reference control has a mathematical model of the spot welding process and calculates an estimated displacement using a predicated process gain and bias calculated by the estimator. The estimated displacement is compared to the precompensator displacement trajectory and an error is generated which regulates the heat command through the PID compensator.
REFERENCES:
patent: 4447700 (1984-05-01), Cohen
patent: 4459457 (1984-07-01), Jurek
patent: 4596917 (1986-06-01), Nied et al.
Computer Controlled System, K. J. Astrom and B. Wittenmark, Prentice-Hall, Inc., 1984, pp. 165, 166, 187-189.
Bernstein Bruce M.
Carey Bernard J.
Haefner Kenneth B.
Overton Kenneth J.
Davis Jr. James C.
General Electric Company
Shaw Clifford C.
Webb II Paul R.
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