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| Number | Title | Issue Date |
| 7246736 | Supplying shielding gas A flexible articulate tubular device has a shank, a plurality of pivot rings, and a terminus with heat sensors and a fiber optic device. The flexible articulate tubular device is initially positioned, either manually or automatically, near a target weld path with th... | 07/24/2007 |
| 7183526 | Apparatus and method for heating works uniformly through high frequency induction coils A high frequency induction-heating device 3 of the apparatus 1 for heating work includes a pair of opposite work coils accommodated within the coil casings 17 and 19 respectively. The casings 17 and 19 can be displaced in a ... | 02/27/2007 |
| 7087854 | Spot welding apparatus A spot welding apparatus for spot welding superposed workpieces by putting the superposed workpieces 3, 4 between a pair of electrodes 1, 2 and applying a welding current between the electrodes under application of pressure, the apparatus having heatin... | 08/08/2006 |
| 7034498 | Resonant motor system In a resonant motor system, an electrical motor having a stator with one or more windings, a rotor which may or may not be wound, and an air gap between the stator and the rotor for storing magnetic energy such that the motor exhibits a definite electrical inductanc... | 04/25/2006 |
| 6911632 | Method for controlling the position of a foil strip edges A method for controlling the edges (7, 7′) of a foil strip guided in a shaping funnel of a device producing tubular bodies from the foil strip by an overlapping weld seam using a guide wedge, the strip being then welded. According to the invention, after we... | 06/28/2005 |
| 6452139 | Method of joining metal components A process for joining high strength metal components by electromagnetic forming techniques. One of the metal components carries high loads or is subjected to combined stresses and strains, thus requiring that it be relatively strong and ductile. EMF or MP... | 09/17/2002 |
| 6359267 | Induction heating system An induction heating system that can be used to braze metals and that overcomes many of the disadvantages of conventional brazing systems. The induction heating system improves quality and lowers production cost for many brazing requirements. The system i... | 03/19/2002 |
| 6264765 | Method and apparatus for casting, hot rolling and annealing non-heat treatment aluminum alloys This invention provides a method and apparatus for casting, hot rolling and annealing of non-heat treatable aluminum alloys which comprises continuously casting, hot rolling, and, in-line with the hot rolling line, inductively heating the aluminum sheet. ... | 07/24/2001 |
| 5902506 | Matching apparatus for connecting high frequency solid state electrical power generator to a load High frequency electrical heating apparatus in which metal parts are heated as they are advanced,either for annealing or forge welding purposes,and in which the electrical heating current is supplied by solid state D.C. to A.C. inverter through a load mat... | 05/11/1999 |
| 5889262 | System for and method of automatically controlling amount of input heat in high-frequency electric resistance welding machine A system and a method for automatically controlling an input heat amount of a high-frequency electric resistance welding machine. The automatic input heat amount control system includes a coil antenna for sensing a spark signal which is generated by elect... | 03/30/1999 |
| 5820703 | Production method of steel pipe excellent in corrosion resistance and weldability A steel pipe having excellent corrosion resistance in an environment containing wet carbon dioxide and a small amount of hydrogen sulfide and having also excellent weldability is produced at a low production cost and with high productivity. The production... | 10/13/1998 |
| 5777299 | Induction generator to heat metallic pipes with a continuous process under a controlled atmosphere An induction heating generator is described for braze-welding metallic pipes with a continuous process under a controlled atmosphere, comprising at least one heating inductor composed of two half-inductors in series whose winding directions for their wind... | 07/07/1998 |
| 5223683 | High frequency electronic welding system A high frequency welding system for tubular members applies high frequency current I to the gap for creating an alternating field. According to magnetic flux of the alternating field, an opposed current i is generated in a conductive portion of the weldin... | 06/29/1993 |
| 4798925 | Method for measuring effective heating power for high frequency heating A method of measuring an effective heating power applied to a workpiece at a position to be heated by a high frequency heating apparatus having a source of high frequency AC power connected to a resonant circuits having a supply of high frequency AC power... | 01/17/1989 |
| 4621176 | Method of and device for monitoring and/or controlling welding current in the high-frequency resistance pressure welding of pipes with longitudinal seams It is necessary to determine welding temperature as precisely as possible in order to properly control the high-frequency welding of longitudinal pipes. Changes in welding temperature are proportional to alterations in the welding current that flows throu... | 11/04/1986 |
| 4599502 | Induction hardening of steel A method for induction hardening through hardened chromium-molybdenum hot work die steel comprising the steps of induction heating to a uniform temperature above the upper critical temperature, cooling, and double tempering at temperatures below the lower... | 07/08/1986 |
| 4584453 | Method and an apparatus for inductively welding a front fork of bicycle The present invention discloses a method for welding the front fork of a bicycle which makes each junctures among the joint, the handlebar, and the fork blades simultaneously reach the melting temperature of a weld metal, so that the weld metal located in... | 04/22/1986 |
| 4578564 | Series-connected, skin-current heating pipe including current trouble detector A series-connected, skin-current heating pipe circuit includes a first ferromagnetic pipe; a first insulated wire extending along and inside the first pipe; a first AC source connected to one end of each of the first pipe and first wire; and an impedance ... | 03/25/1986 |
| 4535215 | Method and device for controlling the welding process in the manufacturing of pipes with longitudinal seams It is necessary to determine the effects of welding pressure in order to control the high-frequency welding process in the manufacture of pipes with longitudinal seams. It has been discovered that measurements of the height of the welding bead provide an ... | 08/13/1985 |
| 4479043 | Controlling the zone of longitudinally seam-welding split tubes The h.f.-heated edges of a split tube are prepared prior to heating by means of contour-rolling the edges in order to obtain a convex contour in which the temperature is isothermically distributed, parallel to the convex edges.... | 10/23/1984 |
| 4377732 | Method of and apparatus for the production of profile members and hollow bodies from a plurality of metal strips of constant thickness A method and apparatus for manufacturing metal profile members, hollow bodies and the like wherein a plurality of continuous band-like metal strips of constant wall thickness as viewed in cross-section are continuously fed along separate paths which conve... | 03/22/1983 |
| 4357512 | Apparatus for continuous manufacture of butt-welded pipe An apparatus for continuous manufacture of butt-welded pipes is constituted by a heating furnace for heating a skelp continuously passed therethrough up to a predetermined temperature less than the butt-welding temperature for the material of the skelp, h... | 11/02/1982 |
| 4303826 | Shielded skin-effect current heated pipeline A pipeline to be laid over a very long distance e.g. 100 km, and heated by skin-effect-current, and used underground or on the seabed by employing an electric source frequency lower than commercial ones, is provided. The pipeline consists of a fluid-trans... | 12/01/1981 |
| 4165246 | Process for the heat treatment of thick walled steel pipes A process in which pipes, particularly thick walled pipes, are inductively heated to the austenization temperature, quenched with a coolant to form martensite in the surface zone, then drawn, with additional heat added when necessary and left to cool with... | 08/21/1979 |
