Method and apparatus for controlling resistance welding
First Claim
1. A control apparatus for resistance welding, comprising:
- time measuring means for measuring an energization time of a welding current, the energization time being required by a given electrode displacement during welding between an electrical conductive weld member and a member to be welded which are arranged between two electrodes;
time difference calculating means for calculating a time difference between the energization time measured by the time measuring means and a preset target energization time; and
feedback control means for correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating means.
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Abstract
A control apparatus for resistance welding includes a time measuring device for measuring an energization time of a welding current, the energization time being required by a given electrode displacement during welding between an electrical conductive weld member and a member to be welded which are arranged between two electrodes. A time difference calculating device is operative for calculating a time difference between the energization time measured by the time measuring device and a preset target energization time. A feedback control device is operative for correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating device.
35 Citations
6 Claims
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1. A control apparatus for resistance welding, comprising:
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time measuring means for measuring an energization time of a welding current, the energization time being required by a given electrode displacement during welding between an electrical conductive weld member and a member to be welded which are arranged between two electrodes; time difference calculating means for calculating a time difference between the energization time measured by the time measuring means and a preset target energization time; and feedback control means for correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating means.
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2. A method of controlling resistance welding, comprising:
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a time measuring step of measuring an energization time of a welding current, the energization time being required by a given electrode displacement during welding between an electrical conductive weld member and a member to be welded which are arranged between two electrodes; a time difference calculating step of calculating a time difference between the energization time measured by the time measuring step and a preset target energization time; and a feedback control step of correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating step.
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3. A control apparatus for resistance welding, comprising:
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time measuring means for measuring an energization time of a welding current, the energization time being required by a given electrode displacement during welding between a terminal and a coated electric wire which are arranged between two electrodes, the terminal containing copper, the coated electric wire having an electric conductor coated with a film of resin; time difference calculating means for calculating a time difference between the energization time measured by the time measuring means and a preset target energization time; and feedback control means for correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating means. - View Dependent Claims (4)
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5. A control apparatus for resistance welding, comprising:
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time measuring means for measuring an energization time of a welding current, the energization time being required to generate a given amount of heat during welding between a terminal and a coated electric wire which are arranged between two electrodes, the terminal containing copper, the coated electric wire having an electric conductor coated with a film of resin; time difference calculating means for calculating a time difference between the energization time measured by the time measuring means and a preset target energization time; and feedback control means for correctively increasing and decreasing a welding current, which occurs at a next weld timing, on the basis of the time difference calculated by the time difference calculating means.
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6. A control apparatus for resistance welding, comprising:
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first means for feeding a first welding current to a first portion to be welded, and then feeding a second welding current to a second portion to be welded; second means for detecting a period during which the first welding current remains fed by the first means; third means for detecting a difference between the period detected by the second means and a preset target period; and fourth means for controlling a magnitude of the second welding current in response to the difference detected by the third means.
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Specification