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| Number | Title | Issue Date |
| 7234627 | Method of joining coiled sucker rod in the field A method of joining coiled sucker rod in the field. In its most basic form, the method includes a first step of placing abutting ends of sucker rod in face to face relation. A second step involves positioning a gas burner in proximity to the abutting ends of sucker ... | 06/26/2007 |
| 7112898 | Real-time digital voltage sag compensator An economical digital voltage sag compensator for overcoming sags in distributed electrical power. The voltage sag compensator employs an inexpensive micro-controller, a full wave bridge rectifier, a DC power supply, a voltage divider and an output switch. The micro... | 09/26/2006 |
| 6825435 | Power supply and control equipment for a resistance welding machine A power supply and control equipment for a resistance welding machine including a battery, battery charger, transistor or mechanical switches, pulse width modulation controller, a unit for generating either constant or time varying power, voltage, or current referen... | 11/30/2004 |
| 6756558 | High current, low impedance resistance welding device A resistance welding apparatus characterized by very low output impedance, and providing a substantially constant voltage source to low impedance (e.g., resistances on the order of 1-100 micro-ohms) materials-to-be-joined. The welding apparatus includes one or more ... | 06/29/2004 |
| 6303894 | Resistance welding with an electrochemical capacitor as the current power source A resistance type pulse welding apparatus for workpieces, including a handpiece, a pair of electrodes mounted at the tip of the handpiece adapted for delivering weld current pulses to a workpiece to be welded, an electrochemical capacitor providing a high... | 10/16/2001 |
| 5880425 | Method and apparatus for joining metals The present invention discloses methods and apparatus for joining of two workpieces. The present invention includes special preparation of the joining ends of the two workpieces to be joined. Methods of the present invention include delivering a high curr... | 03/09/1999 |
| 5814783 | Method and apparatus for real-time weld-quality control and post-process weld-quality verification for homopolar pulsed welding The present invention provides a method and apparatus to control and verify weld-quality in a homopolar pulsed weld by measuring in-process parameters. Methods are disclosed for real-time weld-quality control in a weld-quality control system for homopolar... | 09/29/1998 |
| 5770832 | Method for determining and controlling the cooling rate for metal alloys in an electrical resistance welding process The system of the present invention includes a homopolar generator, a hydraulic uniaxial press to hold the metal alloys to be welded, and electrical connections set at selected distances from the weld interface to provide a desired cooling rate for metal ... | 06/23/1998 |
| 4746783 | Welding current control circuit for spot welder In a spot welder in which the electric charge stored in an electrolytic capacitor (1a) is discharged through a welding circuit 3 to perform a welding operation, in order to prevent the lowering of the welding performance due to the inversion in polarity o... | 05/24/1988 |
| 4656328 | Welding fixture A welding fixture by which two elongate members are manipulated in a manner to become butt welded together. Two gripping members in the form of groups of spaced slip assemblies are enclosed in mounted relationship within a housing. The slips of each group... | 04/07/1987 |
| 4228340 | Voltage regulated capacitive discharge welding power supply A welding power supply that includes a combination of series and shunt regulating circuits controlled by a single controller, in the charging circuit for a welding energy storage capacitor. The series circuit, which includes a series thyristor, regulates the s... | 10/14/1980 |
