Direct current welding system
First Claim
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1. A welding system comprising:
- a direct current source providing welding current and an applied voltage;
an arcing electrode delivering welding current to a workpiece; and
a tungsten member coupling the direct current source to the arcing electrode to limit the amount of welding current delivered to the workpiece without substantially reducing applied voltage.
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Abstract
A battery-powered welder delivers limited DC current to a workpiece without substantial reduction in applied voltage. The DC current is limited by utilizing a tungsten member in series between the battery and an arcing electrode. There is specifically disclosed a TIG welder embodiment.
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Citations
19 Claims
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1. A welding system comprising:
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a direct current source providing welding current and an applied voltage; an arcing electrode delivering welding current to a workpiece; and a tungsten member coupling the direct current source to the arcing electrode to limit the amount of welding current delivered to the workpiece without substantially reducing applied voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tungsten inert gas welding system comprising:
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a direct current source providing welding current and an applied voltage; a tungsten member connected in series to the direct current source to limit the amount of the current delivered to workpiece without substantially reducing the voltage; a handpiece having an arcing electrode connectable to the tungsten member, and delivering welding current to a workpiece; said handpiece including an operator-actuated switch for on and off control of weld current delivery to the workpiece; an inert gas supply coupled to the handpiece and providing shield gas to an arc struck by the arcing electrode; a plurality of receptacles connected to the tungsten member at various locations along its length, the receptacles being adapted to provide electrical tap connections to establish a desired magnitude of welding current; a housing for enclosure of the tungsten member; a valve to control inert gas flow into the housing for cooling the tungsten member; a first solenoid actuating said gas valve between open and closed positions; a second solenoid interconnected between the direct current source and the length of tungsten; and an electrical connection of the operator-actuated switch to the first and second solenoids. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of welding a workpiece comprising the steps of:
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a. applying a direct current voltage to an arcing electrode; b. establishing an arc between the arcing electrode and a workpiece; and c. conducting welding current to the arcing electrode through a tungsten member that limits current delivered to the workpiece without substantial reduction in applied voltage.
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Specification