Other

Ivan A Chernenko

Vladimir I Tishura

Vladimir K Lebedev

Sergei I Kuchuk-Yatsenko

Leonid V Litvin

Alexandr T Dyshlenko

Mikhail V Bogorsky

Vitaly T Cherednichok

Alexandr I Kulesh

Nikolai Ivanovich Postolaty

Yakov Borisovich Entin

Evgeny Petrovich Martynov

Alexandr Nikolaevich Filippov

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

In accordance with the disclosure, the workpieces being welded are brought together by rectilinearly oscillating at least one of them along the line of bringing them together with the amplitude in the movement of the workpiece towards the other workpiece greater than that in the movement of the same workpiece in the direction opposite to the direction towards the other workpiece, voltage is applied to said workpieces for flashing and heating them in the course of bringing them together, and then an upset force is applied to the workpieces. The hydraulic drive adapted to generate the oscillatory rectilinear motion in a continuous flash butt-welding machine includes a hydraulic cylinder with two chambers which provides for moving one of the workpieces being welded with respect to the other and comprises apparatus for feeding hydraulic fluid alternately into either of the chambers of the hydraulic cylinder of the machine, the apparatus being connected with the cylinder through two hydraulic lines. The lines serve alternately one as the inlet line and another as the outlet line and are interconnected by two hydraulic conduits, either of which incorporates an adjustable throttle and a check valve. The check valves are arranged so that either of them by-passes hydraulic fluid from the inlet line into the outlet line. The adjustable throttles are adjusted so that the hydraulic fluid volume admitted into the hydraulic cylinder of the machine to move the workpiece towards the other workpiece is greater than the hydraulic fluid volume admitted thereinto to move the same workpiece in the opposite direction.

Method of continuous flash butt welding and hydraulic drive of

A method for controlling flashing speed during resistance butt welding comprises measuring values of current density for at least two joints between parts being welded, converting them into d-c. voltages, detecting a maximum voltage value, comparing it to a preset d-c. voltage, the resultant difference value being used as flashing speed control parameter. An apparatus for carrying out the method comprises electric circuits whose number is equal to the number of joints being welded. Each circuit comprises a welding transformer and a circuit for conversion of flashing current density into d-c. voltage. A maximum signal detector comprises circuits for conversion of current density into d-c. voltages, whose number is equal to the number of joints being welded. The detector output is connected to the circuit for comparing a current voltage value to the preset one. The apparatus according to the invention may be used mainly for controlling flashing speed during concurrent resistance butt welding of several joints of large and different respective cross-sectional areas.

Method and apparatus for controlling flashing speed during resistance

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Kyiv, Ukraine

Ivan A Chernenko