Control apparatus for resistance welding machine
First Claim
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1. A control apparatus for a resistance welding machine, comprising:
- setting nugget input means for inputting a setting nugget size;
nugget estimating means for estimating a size of a nugget being formed;
nugget growth predicting means for predicting a nugget growth curve after a certain time interval and a required welding time for the predicted nugget growth;
current control judgement means for generating a control signal to equalize the required welding time with a recommended welding time; and
control means for controlling a welding current in accordance with said control signal.
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Abstract
A control apparatus for a resistance welding machine comprises a welding current detecting device for detecting a welding current, interelectrode voltage detecting device for detecting an interelectrode voltage, a calculating section for predicting a nugget growth or estimating an expulsion & surface-flash generation probability, and control section for controlling the welding current so that the nugget growth or the expulsion & surface-flash generation probability can be adjusted to a predetermined value.
21 Citations
12 Claims
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1. A control apparatus for a resistance welding machine, comprising:
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setting nugget input means for inputting a setting nugget size; nugget estimating means for estimating a size of a nugget being formed; nugget growth predicting means for predicting a nugget growth curve after a certain time interval and a required welding time for the predicted nugget growth; current control judgement means for generating a control signal to equalize the required welding time with a recommended welding time; and control means for controlling a welding current in accordance with said control signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control apparatus for a resistance welding machine, comprising:
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welding current detecting means for detecting a welding current; interelectrode voltage detecting means for detecting an interelectrode voltage; energy distribution estimating means for estimating an energy distribution in a portion being welded based on time variations of the welding current and the interelectrode voltage detected by said welding current detecting means and said interelectrode voltage detecting means; and expulsion &
surface flash generation probability estimating means for estimating an expulsion &
surface-flash generation probability based on said energy distribution obtained by said energy distribution estimating means and for supplying a control signal to said welding machine based on said estimated probability. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification