Resistance welding controller and method including thermal conduction simulation of weld nugget condition
First Claim
1. An apparatus for controlling resistance welding, comprising:
- a current detection means for detecting a welding current;
a voltage detection means for detecting a voltage between welding electrodes;
a first operating means for outputting an estimated condition value, which represents a state of a nugget being formed, obtained by inputting said voltage and current detected, and applying a thermal conduction simulation on a welding part;
a second operating means for outputting a modification to a welding condition, based on the result of a comparison between said estimated condition value and a change rate of the temperature at a point of a simulation calculation model for forming a desired nugget; and
an output means which changes said welding condition of a welding unit in accordance with the modification to said welding condition.
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Accused Products
Abstract
An apparatus for controlling the resistance welding comprises a first operation for yielding an estimated condition value representing a state of nugget formation through the application of a thermal conduction simulation to welding part, a second operation for outputting a modification to welding condition based on the result of comparison between the estimated condition value and a predetermined standard condition value for forming a desired nugget, and an output for practically changing the welding condition of welding unit in accordance with the modification. Namely, the welding condition is kept controlled through the feedback of difference between a given standard condition value and an estimated condition value derived from simulation.
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Citations
9 Claims
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1. An apparatus for controlling resistance welding, comprising:
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a current detection means for detecting a welding current; a voltage detection means for detecting a voltage between welding electrodes; a first operating means for outputting an estimated condition value, which represents a state of a nugget being formed, obtained by inputting said voltage and current detected, and applying a thermal conduction simulation on a welding part; a second operating means for outputting a modification to a welding condition, based on the result of a comparison between said estimated condition value and a change rate of the temperature at a point of a simulation calculation model for forming a desired nugget; and an output means which changes said welding condition of a welding unit in accordance with the modification to said welding condition.
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2. A method of controlling resistance welding, comprising the steps of:
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obtaining an estimated condition value which represents a condition of nugget formation, by applying a thermal conduction simulation to a welding part; outputting a modification to a welding condition based on the result of comparison between said estimated condition value and a predetermined standard condition value needed for forming a desired nugget; changing said welding condition in accordance with said modification to welding condition, wherein said predetermined standard condition value is a change rate of the temperature at a standard point. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification