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| Number | Title | Issue Date |
| 5768779 | Method of manufacturing cylinder head for engine An improved method of forming a bonded valve seat for a cylinder head wherein the configuration of the insert ring and cylinder head recess is such to ensure good bonding over the entire area and the proper amount of sinking of the insert ring into the cy... | 06/23/1998 |
| 5030814 | Indirect spot welding method A method of indirect spot welding two or more members together, comprising the steps of pressing electrodes against at least one of the members, flowing a square wave current between the electrodes and across the members during a first time period, pausin... | 07/09/1991 |
| 4901506 | Heat seal temperature control Method and circuitry is disclosed for controlling and stabilizing temperature of a resistance heat sealing element used in packaging operations. Temperature of the heat sealing element is measured by monitoring its resistance by means of a current sensing... | 02/20/1990 |
| 4785159 | Dental welding device and system A precision electric welding device is used for welding dental crowns and bridges in the mouth. The dental elements to be welded comprise dentally suitable metals, especially titanium and titanium alloys. The device comprises a welding gun and a base unit... | 11/15/1988 |
| 4687900 | Fusing methods and apparatus therefor Methods and apparatus for fusing elements such as wires to one another. The elements to be fused are engaged in a notch or channel in one electrode, so that a first element, typically a stranded wire, contacts this electrode and also contacts the other el... | 08/18/1987 |
| 4681999 | Apparatus for welding dental elements A precision electric welding device is used for welding dental crowns and bridges in the mouth, the dental elements to be welded being made up of dentally suitable metals, especially of titanium and titanium alloys. The device comprises, in combination, a... | 07/21/1987 |
| 4560852 | Spike welding system having improved power supply A power supply for a pulse type electrical resistance welder includes an A.C. source of electrical power, a firing circuit for delivering spikes of current to a pair of welding electrodes and a precharging circuit for precharging the firing circuit with a... | 12/24/1985 |
| 4447698 | Welding system monitoring and control system A monitoring and control system for use in conjunction with a pulse type welder which utilizes a computer to calculate the impedance characteristics of a weld and compare these characteristics to a preselected set of characteristics to determine if a qual... | 05/08/1984 |
| 4409461 | Electrical resistance welder for nails used in an automatic nailing machine In an electrical resistance welder, whenever a material to be welded approaches the welding electrodes, a start signal is produced, so that welding current is supplied to the welding transformer in one direction for a certain period of time set by a time ... | 10/11/1983 |
| 4395615 | Apparatus for welding metal trusses Apparatus for fabricating metal trusses having spaced preformed chord members of generally longitudinal predetermined length and cross-section joined by at least one preformed supporting web member of predetermined length and cross-section by electrically... | 07/26/1983 |
| 4359623 | Method and apparatus for bonding terminals to electrical devices A strip (21) of pairs of terminals (13 and 14) are incrementally advanced into a bonding station (24) where electrical components, e.g., metallized film capacitors (10), are successively advanced adjacent to each pair of terminals. Each pair of terminals ... | 11/16/1982 |
| 4342899 | Method of fabricating honeycomb core structure A machine or apparatus simultaneously manufactures a core-reinforced welded panel and assembles core strips in operative relationship with the face sheets of said panel. The machine includes a first welding head which is insertable in the space between th... | 08/03/1982 |
| 4302653 | Method and apparatus for monitoring and controlling a resistance welding operation A resistance welding controller for dynamically controlling both weld current and weld time in order to achieve a desired ƊR value. The resistance across the weld electrodes is monitored by the controller during the heat-up phase of the weld and compared... | 11/24/1981 |
| 4230929 | Control circuit for a welding device A control circuit for accurately controlling the duration of a welding operation. In a preferred embodiment the control circuit includes first and second connectors for connecting the control circuit to a power source, welding and control transformers, th... | 10/28/1980 |
| 4158121 | Spot welder control circuit A phase controlled regulating circuit for a portable spot welder having an output transformer, utilizes a normally saturated transistor across one diagonal of a diode bridge circuit to interrupt the connection between the control voltage source and the re... | 06/12/1979 |
| 4144440 | Method and apparatus for controlling welding operations during resistance welding A method of, and apparatus for, respectively controlling the start of welding and the termination of welding during continuous resistance welding with the aid of an alternating-current at a roll-welding machine, wherein at least at one measuring station o... | 03/13/1979 |
| 4135075 | Resistance welding apparatus and method In combination with a resistance spot welding machine for welding superimposed electrically conductive members an improved apparatus for and method of cleaning welding electrodes and associated portions of the members to be welded are provided utilizing i... | 01/16/1979 |
| 4132880 | Seam welding method and apparatus A high speed seam welding system wherein single phase alternating current welding pulses are applied to electrode mechanism during only a less than maximum amplitude fractional portion of the wave form representing each successive current half cycle, and ... | 01/02/1979 |
| 3992602 | Resistance welding apparatus and method In combination with conventional apparatus for joining members of aluminum or other electrically conducting material by resistance welding, adjustable supports for arranging the work-contacting electrodes in spaced proximity to the work, and circuitry for... | 11/16/1976 |
