Direct current pulse welder
First Claim
Patent Images
1. A direct current resistance spot welder comprising:
- pulse amplifying means having an input and an output side for generating a welding energy pulse;
electric circuit means interconnecting the output side of the amplifying means to welding electrodes of the welder;
voltage feedback means interconnected between the output and input sides of the amplifying means in a first feedback path to supply a voltage feedback signal to the input side;
current feedback means interconnected between the output and input sides of the amplifying means in a second feedback path to supply a current feedpack signal to the input side; and
a source of power electrically coupled to the pulse amplifying means and the electric circuit means for delivering energy through the amplifying means to the welding electrodes whereby the voltage and current feedback signals from the feedback means are summed to control the output impedance of the welder and produce an essentially constant voltage-current product at the welding electrodes.
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Abstract
A direct current pulse welder including circuitry for controlling the amount of electric energy delivered to the weld site. By means of feedback techniques the output impedance of the welder is adjusted and changed by utilizing a voltage feedback signal and a current feedback signal to match the impedance of the weld site. Matching the impedance of the welder to the impedance of the weld site enables the welder to deliver the correct amount of power desired to each weld regardless of variations in actual impedance of the weld sites that occur in actual production situations.
6 Citations
11 Claims
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1. A direct current resistance spot welder comprising:
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pulse amplifying means having an input and an output side for generating a welding energy pulse; electric circuit means interconnecting the output side of the amplifying means to welding electrodes of the welder; voltage feedback means interconnected between the output and input sides of the amplifying means in a first feedback path to supply a voltage feedback signal to the input side; current feedback means interconnected between the output and input sides of the amplifying means in a second feedback path to supply a current feedpack signal to the input side; and a source of power electrically coupled to the pulse amplifying means and the electric circuit means for delivering energy through the amplifying means to the welding electrodes whereby the voltage and current feedback signals from the feedback means are summed to control the output impedance of the welder and produce an essentially constant voltage-current product at the welding electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A direct current welding power supply comprising:
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welding electrodes for delivering a predetermined welding energy pulse at a weld site; control means for adjusting the amplitude and duration of the welding energy pulse; amplifying means having a summing junction and an output; means for connecting the control means to the summing junction; voltage feedback means connected in a first feedback path to the summing junction to provide a voltage feedback signal representative of the voltage developed across the welding electrodes; current feedback means connected in a second feedback path to the summing junction to provide a current feedback signal representative of the current flowing through the welding electrodes; and a source of power electrically coupled to the amplifying means for delivering energy to the amplifying means and to the weld site whereby the voltage and current feedback signals cause the welding energy pulse to have an essentially constant voltage-current product at the weld site.
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Specification