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Institut Elektrosvarki, Imeni E.o. Patona

Live Tissue Connect, Inc.

Institut Elektrosvarki Imeni E.o. Patona Akademii Nauk Ukrainskoi Ssr

Livo Tissue Connect, Inc.

Institut Elektrovarki Imeni E.o. Patona

Vladimir K Lebedev

Boris E Paton

Sergei I Kuchuk-Yatsenko

Vasily A Sakharnov

Boris A Galyan

Boris A Galian

Vladimir I Tishura

Olga N Ivanova

Yuri A Furmanov

Valery G Krivenko

Mikhail R Unigovsky

Vitaly T Cherednichok

Ivan A Chernenko

Irina M Savitskaya

Alexsey V Lebedev

Alexandr Y Furmanov

Valery A Vasilchenko

Yevgen V Zhyvodernikov

Andrei A Lyashenko

Stanislav D Dobrovolsky

Volodimir I Karchemsky

Dmitry F Sidorenko

Vitaly P Iemchenko-Ribko

David S Vorona

Vladimir A Troitsky

Sergei A Solodovnikov

Orest M Serafin

Grigory B Asoyants

Boris E Scherbina

Alexandr T Dyshlenko

Mikhail Petrovich Pashulya

Pavel Petrovich Sheiko

Oleg M Ivantsov

Leonid V Litvin

Mikhail V Bogorsky

Nikolai V Podola

Evgeny V Rulevsky

Grigory B Asoiants

Alexei P Obolonsky

Nikolai G Bely

Vladimir A Nagaitsev

Pavel A Zhinzhikov

Dmitry N Parshin

Boris Antonovich Steblovsky

Vasily F Zagadarchuk

Jury D Gupalo

Semen Arefievich Kalinnikov

Gennady I Chelnokov

Gennady V Vinogradov

Valentin I Krivorotenko

Alexandr K Kharchenko

Alexandr I Krasnov

Jury I Borju

Alexandr N Korneev

Boris V Nudelman

Mikhail N Sidorenko

Mykhailo P Zakharash

Nikolai Ivanovich Postolaty

Anatoly A Toldin

Lev G Mironov

Yakov Borisovich Entin

Alexandr P Miroshnichenko

Yurii A Masalov

Evgeny Petrovich Martynov

Mikhail F Vorobei

Boris I Kazimov

Alexandr Nikolaevich Filippov

Alexei A Rossoshinsky

Alexei V Lebedev

Valentin I Balakin

Alexandr K Babak

Technique for bonding soft biological tissue having an incision therein with forceps adapted to grip a portion of tissue on both sides of incision. Electrodes are secured to forceps for contracting the tissue portion. An electrical power source provides a high frequency electrical signal to electrodes to be passed through the tissue portion. The electrical power source is controlled to provide electrodes with one voltage signal during a first of two stages, wherein the voltage rises linearly, and another voltage signal during a second of the two stages, wherein the voltage is stabilized and modulated with a low frequency rectangular signal. A clamping means applies force with the forceps to compress the tissue at one or different levels during two time periods while the high frequency voltage is passed through the electrodes. The tissue impedance is measured as a function of time, with its minimal value being determined and stored.

Bonding of soft biological tissues by passing high frequency electric current therethrough

A system and method for welding of biological tissue by applying an RF voltage during a first stage to electrodes of a tissue welding tool; monitoring tissue impedance, and determining a minimum tissue impedance value during the first stage; determining relative tissue impedance; detecting when the relative tissue impedance reaches a predetermined relative tissue impedance value and starting a second stage; calculating the duration of the second stage as a function of the duration of the first stage; and applying the RF voltage during the second stage to the electrodes of the tissue welding tool.

System and method for control of tissue welding

A technique for bonding soft biological tissue having an incision therein with forceps adapted to grip a portion of the tissue on both sides of the incision. Electrodes are secured to the forceps for contacting the tissue portion. An electrical power source provides a high frequency electrical signal to the electrodes to be passed through the tissue portion. The electrical power source is controlled to provide the electrodes with one voltage signal during a first of two stages, and another voltage signal during a second of the two stages. During the first stage the voltage rises linearly. During the second stage, the voltage is stabilized and is modulated with a low frequency rectangular signal. A clamping means applies force with the forceps to compress the tissue at one level or at different levels during two time periods while the high frequency voltage is passed through the electrodes. The tissue impedance is measured as a function of time, with its minimal value being determined and stored. At an instant when the impedance reaches its minimal value, the linear rise of the high frequency voltage is stopped, and the voltage is stabilized at the attained level. After that the ratio of the tissue impedance to its minimal value is determined as a function of time. The passing of the high frequency voltage to the electrodes is stopped as soon as such ratio reaches a preset value, which is specific for each tissue being bonded. The material for making electrodes is selected so that the electrode may serve as an effective heat sink for conducting heat away from the tissue surface. The electrodes are dimensioned relative to the thickness of tissue in a compressed state.

A welding complex in accordance with the invention comprises a machine for resistance butt welding, means for supporting the end part of the pipeline and holding means including a platform reciprocable axially of the pipeline and a plate with a device for carrying the pipe section to be welded, rotatable by a drive between the positions of loading a pipe section and aligning it with the pipeline. For loading the holding means with the plate rotated into the loading position, by longitudinally displacing a pipe section from the accumulator, the latter is arranged alongside the platform, so that the pipe section it delivers extends at an acute angle relative to the end of the pipeline.

Welding complex

The machine of the invention, intended for resistance butt welding of pipes, comprises two semi-housings mounted externally on the pipes to be welded to the opposite sides of a joint and interconnected by the flash and upset drive, a clamping device mounted in each semihousing, including radially arranged hydraulic cylinders with clamping shoes, and a control system of the hydraulic cylinders. The control system of the hydraulic cylinders includes control valve units structurally associated with the piston rods of the hydraulic cylinders. The control valve units include follow-up spool valves interconnected by their common actuator linkage.

Machine for resistance butt welding of pipes

An electromagnetic power drive for a friction welding machine, comprising a magnetic core installed immovably, which carries a power coil connected to a voltage regulator made as a switch and at least one pickup coil connected to an integrator producing voltage proportional to the actual value of the magnetic flux during friction welding, which is connected to a comparison means comprising two comparators, a driving input of one of said comparators receives voltage proportional to the assigned value of the magnetic flux during friction welding, the driving input of the other comparator receives voltage proportional to the other assigned value of the magnetic flux, and a control signal generator having a hysteresis-loop output characteristic, which is connected to the comparators, the output of said generator being the output of the comparison means electrically coupled with the voltage regulator.

Electromagnetic power drive for a friction welding machine

A method of friction welding wherein the parts to be welded, of materials with inherent Young's moduli, are jigged coaxially, set to rotate with respect to each other under an axial pressure recurrently varying with a frequency which is in inverse proportion to the lower value of the Young's moduli and to the diameter--or to the smaller diameter--of the parts while these are being heated up for welding, whereby, the value of the frequency varies over a range between + and -15% and the parts are then upset-forged together.

Method of friction welding

A mobile arrangement for laying a continuous pipeline comprises a resistance welding apparatus, an outer flash trimmer, and at least one pipe-laying means. A jib of the pipe-laying means has a longitudinal support structure suspended therefrom. A suspension is attached to this longitudinal support structure. The front end of said longitudinal support structure carries an outer flash trimmer, and the rear end of said longitudinal support structure carries an inductor for thermal treatment of the weld.

Mobile arrangement for laying a continuous pipeline

An internal apparatus for flash welding pipes together in end to end relationship both under factory conditions and in the field, for example in laying trunk pipelines, comprises an elongate supporting member carrying an axially movable clamping assembly with electrode jaws for clamping one pipe, an axially immovable clamping assembly with electrode jaws for clamping the other pipe, and a doughnut-type welding transformer. The welding transformer is disposed at the side of the axially immovable clamping assembly, which is distant from the joint. The axially immovable clamping assembly is mounted on the elongate supporting member in a manner to provide an annular clearance therebetween such that there are extending therethrough two coaxial contact tubes, which are electrically insulated from one another and connect the welding transformer with the electrode jaws, whereby in operation a welding circuit is established.

Apparatus for flash welding of pipes

Disclosed are welding current pick-ups which are switched into welding circuits. Outputs of these pick-ups are connected to inputs of a logical coincidence unit having its output connected to a control input of a welding program control unit whose output is connected with a drive adapted for moving the workpieces being welded.

Program control device for controlling flash butt welding process

A pipe resistance butt welding apparatus comprises a body with an elongated arrying member and two internal expanding clamps including current-feeding shoes. One of the clamps is rigidly attached to the body, whereas the other is movably mounted on the elongated carrying member and connected with a drive intended to communicate reciprocating motion to the other clamp. A trimming mechanism for removing flash is mounted on at least one of the internal expanding clamps. The body of the apparatus mounts centering supporting rollers and driving wheels, the former and the latter being secured thereto by means of spring-loaded levers. The driving wheels are connected with a rotation drive intended to rotate the wheels. The body carries a powder cylinder and spring-loaded three-arm rockers, the latter being turnably mounted. The first arm of each of said three-arm rockers carries a driving wheel, the second arm carries an additional supporting roller, and the third arm is connected with a rod of the power cylinder.

Pipe resistance butt welding apparatus

In an electrolytic cell for producing a mixture of hydrogen and oxygen bipolar electrodes adapted for operating electrically in series have a through shaped configuration and are arranged so that their depressions are on one and like side. Interposed between the electrodes are gaskets of electrical insulating material forming the cell tank. Each gasket is placed around the edges of the electrode depression so that a portion thereof axially of the electrolytic cell is in touch with the adjacent electrode. The electrolytic cell is held as a unit with studs extending through openings in peripheral portions of the electrodes that project laterally of the electrolytic cell.

Electrolytic filter press cell for producing a mixture of hydrogen and

An apparatus comprises a body having V-shaped two-arm levers mounted thereon. Around the periphery of the body there are mounted cutting tool holders pivoted each to one arm of each of the levers. Secured to the body are drives for turning the levers and each connected with the other arm of each of the levers. On the front and rear ends of the cutting tool holders there are mounted rollers in contact with the inside surface of the pipe. Rigidly attached to the cutting tool holders are cutting tools.

Apparatus for removing flash from pipes

Surfaces of metal workpieces being welded are fused at a constant speed of feeding the workpieces towards each other, and the speed of feeding is, before the upsetting, increased to a final value thereof for a period of (1.0 to 4.0) (.DELTA.max/v.sub.1), where .DELTA..sub.max is the maximum gap between the workpiece surfaces being welded and v.sub.1 is the average speed of feeding the workpieces over the period of its increase. Empirical formulas are given to determine the maximum gap for workpieces of various thicknesses.

Method of resistance flash butt welding

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Kyiv, Ukraine

Vladimir K Lebedev