Electric resistance welding system
First Claim
1. A resistance welding system comprising:
- a pair of electrodes for gripping workpieces therebetween;
an electric power source for generating a welding current comprising a plurality of cycles that is conducted across said workpieces by said pair of electrodes;
a controller for controlling said electric power source and executing a welding operation process, and,means for adjusting one of a welding current and a welding voltage based on a sensed voltage between said pair of electrodes between welding cycles to a value required to apply a predetermined power per unit time and per unit volume so that a predetermined total power per unit volume is applied to the workpiece that will be welded.
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Accused Products
Abstract
A predetermined value is used for adjusting welding power to an optimum value to consistently achieve sturdy welds. The predetermined value is not affected by variations in workpiece materials and in wear of electrodes. Preferably, total power per unit volume of the workpieces is used as the predetermined value. In a resistance welding system, total power per unit volume required to satisfactorily weld the workpieces is calculated from a total thickness of the workpieces and a welding time. From this calculated total power per unit volume, power per unit volume and per unit time is calculated. The present welding system adjusts one of the welding current or the welding voltage to an optimum value required to produce the predetermined value.
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Citations
14 Claims
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1. A resistance welding system comprising:
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a pair of electrodes for gripping workpieces therebetween; an electric power source for generating a welding current comprising a plurality of cycles that is conducted across said workpieces by said pair of electrodes; a controller for controlling said electric power source and executing a welding operation process, and, means for adjusting one of a welding current and a welding voltage based on a sensed voltage between said pair of electrodes between welding cycles to a value required to apply a predetermined power per unit time and per unit volume so that a predetermined total power per unit volume is applied to the workpiece that will be welded. - View Dependent Claims (2, 3, 4)
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5. A resistance welding system comprising;
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a pair of electrodes for holding workpieces therebetween; an electric power source for generating a welding current that is conducted across said workpieces by said pair of electrodes; and a controller for controlling said electric power source and executing a welding operation process, means for measuring a total energy per unit volume applied to the workpieces during a welding period; and means for comparing said measured total energy value and a predetermined total energy value. - View Dependent Claims (6)
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7. A method for resistance welding comprising the steps of:
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providing a pair of workpieces; providing a pair of electrodes; gripping said workpieces with said electrodes; connecting an electric power source to said electrodes; executing a welding operation process by generating an electric current across said electrodes and adjusting one of the welding current and the welding voltage to a value required to apply a predetermined power per unit time per unit volume in a series of steps so that a predetermined total energy per unit volume is applied to said workpieces said value based on the voltage between said workpieces between said steps. - View Dependent Claims (8, 9, 10)
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11. A method for resistance welding comprising the steps of:
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providing a pair of workpieces in contact with one another, each having a thickness and being comprised of a material; providing a pair of electrodes; gripping said workpieces with said electrodes; connecting an electric power source to said electrodes; determining a total power per unit volume for a weld based on said material and the thickness of said pair of workpieces; determining a number of welding cycles based on the thickness of said pair of workpieces; applying a first predetermined power per unit volume to said workpieces; measuring the voltage between said electrodes; adjusting said power source based on said measured voltage and applying a second predetermined power per unit volume; repeatedly measuring the voltage, adjusting said power source based on said measured voltage and applying subsequent predetermined amounts of power per unit volume until said number of welding cycles has been completed. - View Dependent Claims (12, 13, 14)
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Specification