Method of controlling welding conditions of a resistance welder
First Claim
1. A method of controlling welding conditions of a resistance welder, comprising the steps of:
- detecting a welding current and a chip-to-chip voltage;
using a heat conduction simulator for performing simulation of a welding portion on the basis of heat conduction calculation from the detected welding current and the detected chip-to-chip voltage;
estimating a status quantity expressing a nugget-forming state during welding in said welding portion;
comparing said status quantity with a reference status quantity at the time of estimation;
correcting the welding conditions on the basis of the result of comparison; and
modifying at least one of a configuration of said heat conduction simulator and a numerical value of said heat conduction simulator on the basis of a monitored value expressing a state of welding after welding is started so as to make said status quantity coincide with said reference status quantity.
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Accused Products
Abstract
The invention concerns a method of controlling welding conditions of a resistance welder, in which the nugget generating state can be estimated with general-purpose properties, and in which accurate and high-quality resultant welding can be obtained. Through a process of using a heat conduction simulator for performing simulation of a welding portion on the basis of heat conduction calculation, estimating the status quantity expressing the state in which a nugget is formed in the welding portion during welding, comparing the status quantity with reference status quantity led out of a physical phenomenon generating during welding at the time of estimation, and correcting the heat conduction simulator on the basis of the comparison result, it is possible to control the welding conditions accurately, and it is possible to obtain accurate and high-quality resultant welding.
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Citations
11 Claims
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1. A method of controlling welding conditions of a resistance welder, comprising the steps of:
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detecting a welding current and a chip-to-chip voltage; using a heat conduction simulator for performing simulation of a welding portion on the basis of heat conduction calculation from the detected welding current and the detected chip-to-chip voltage; estimating a status quantity expressing a nugget-forming state during welding in said welding portion; comparing said status quantity with a reference status quantity at the time of estimation; correcting the welding conditions on the basis of the result of comparison; and modifying at least one of a configuration of said heat conduction simulator and a numerical value of said heat conduction simulator on the basis of a monitored value expressing a state of welding after welding is started so as to make said status quantity coincide with said reference status quantity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling welding conditions of a resistance welder by using a heat conduction simulator, said heat conduction simulator performing simulation of a welding portion on the basis of heat conduction calculation from detected values of a welding current and a chip-to-chip voltage, said method comprising the steps of:
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estimating a status quantity expressing a nugget-forming state during welding in said welding portion by said heat conduction simulator; comparing said status quantity with a reference status quantity at the time of estimation, said reference status being determined on the basis of a monitored value expressing the state of welding; and on the basis of the result of comparison, correcting the welding conditions, while modifying at least one of a configuration of said heat conduction simulator and a numerical value of said heat conduction simulator so as to make said status quantity coincide with said reference status quantity.
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11. An apparatus for controlling welding conditions of a resistance welder by using a heat conduction simulator, said heat conduction simulator performing simulation of a welding portion on the basis of heat conduction calculation from detected values of a welding current and a chip-to-chip voltage, said apparatus comprising:
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means for estimating a status quantity expressing a nugget-forming state during welding in said welding portion by said heat conduction simulator; means for comparing said status quantity with a reference status quantity at the time of estimation, said reference status being determined on the basis of a monitored value expressing the state of welding; means for correcting the welding conditions on the basis of the result of comparison; and means for modifying, during a welding operation, at least one of a configuration of said heat conduction simulator and a numerical value of said heat conduction simulator on the basis of the result of comparison so as to make said status quantity coincide with said reference status quantity.
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Specification