Abstract: The apparatus for acoustic-emission inspection of articles has channels e including a series connection of a transducer of acoustic emission signals, positionable on an article under inspection, and an amplifier of electric signals, having connected to its output a unit for measuring the parameters of acoustic emission signals and a shaper of single pulses, of which the output is connected to the first input of a unit for measuring time intervals. The other input of the unit for measuring time intervals of each channel is connected to the output of a clock pulse generator. The output of the clock pulse generator is also connected to the input of a frequency divider. The apparatus further comprises an OR gate of which the inputs, in a number equalling the number of the channels, are connected to the outputs of the shapers of single pulses of each channel, and the output is connected to the third inputs of the units for measuring time intervals in each channel.

Abstract: An apparatus for overhead submerged-arc welding has a rotatable hopper containing flux and accommodating a bowl communicating with a driven auger feeder having an auger rotating at a constant speed. In the bowl is extended a welding nozzle for a consumable electrode and a former is provided adjacent to the welding nozzle above the brim of the open part of the bowl facing towards a work being welded. The apparatus is also provided with a counter for counting the number of revolutions of the auger and a means for controlling flux supplied to the bowl which are connected to each other for actuating the latter when the auger has completed a preset number of revolutions.

Abstract: The machine incorporates two clamping means, a static one fitted to a bedframe and a movable one mounted on rods which are attached to upsetting hydraulic cylinders with their ends with provision for reciprocating back and forth. Each clamping means consists of a base and a holding-down plate which is hinged to the base and displaced by a hydraulic cylinder a body of which is hinged to the base and a piston rod of which is hinged to the holding-down plate interacting with a holding down roller in clamping workpieces. The machine is provided with a fastener in the form of an inverted L-shaped lever, a means of adjusting the alignment of the workpieces for welding, and a means of setting a gap between the workpieces, made as a plunger and an adjustable stop installed coaxially.

Abstract: A method of producing monolithic metal blanks by freezing-on techniques resides in that the surface of a liquid metal melt is heated with the formation of a variable temperature field, defined by the temperature gradient between heating zones and cooling zones. The lines of equal temperatures constitute isotherms. The heating zones are disposed so that the isotherms having a temperature close to the crystallization temperature T.sub.c repeat the shape of the cross-section of the blank to be produced. A dummy bar is immersed equidistantly to the isotherm with the temperature of crystallization T.sub.c. Subsequent drawing out of the dummy bar from the melt with a linear speed defined by the rate of crystallization results in the formation of the blank.

Abstract: Disclosed is a machine for flash butt welding of pipes located in the bore of the pipes welded together, a housing (2) whereof is provided with rigidly attached thereto a first supporting disc (3) and a second supporting disc (4) and with a pipe flashing-and-upsetting means (5) which has a carrier (7) and a hydraulic actuator (6) for displacing said means along the housing (2) and also has two pipe clamping means (9, 10) each whereof is provided with a carrier (12 and 13) and self-contained hydraulic actuators (11) imparting axial motion to this clamping means.

Abstract: A method of manufacturing the adapter of a multipole slab includes assembling simultaneously a stack of alternating plates of magnetic steel and non-magnetic steel, a solder and a thin-wall steel container of which the walls sealingly enclose the stack of the plates and the solder. Then the container with the stacked plates and solder therein is heated to a soldering temperature, and subsequently cooled. Then the walls of the container adjoining the edges of the stacked plates are removed.

Abstract: The proposed method relates to the ionization of plasma-generating gas in a ilot arc before being supplied to the electrode region, thus generating charges in this electrode region, the charges promoting dispersion of an arc spot. For this purpose, an electrode assembly is provided within the plasma-arc torch, which electrode assembly comprises a hollow tungsten electrode and a solid electrode of the same metal, the solid electrode being radially spaced from the hollow electrode. Both electrodes are put in an electric power circuit, whereby an arc is initiated between the electrodes when switching on the electric circuit, plasma being generated in the arc, which plasma serves to start the main arc and provides for dispersion of the arc spot over the surface of the hollow electrode. This decreases the current density in the arc spots and, hence, minimizes electrode erosion.

Abstract: 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.

Abstract: Ground metallic adding material is fed into the welding gap. Electrodes are introduced into the gap in pairs, one electrode in a pair opposite the other, at an angle equal to the angle of divergence of the end faces being welded together. The electrodes are positioned so that their larger faces are parallel with the end faces being welded together and the smaller faces extend beyond the side surface of the workpiece being welded.

Abstract: The arrangement comprises a body constructed in the form of a grip clamp arable from the vertical axis of a workpiece, and having two jaws coupled with each other in the upper portion thereof by a clamping cylinder. The arrangement further comprises cutters for deburring, and a mechanism for pressing said cutters to the workpiece surface. The cutters are mounted in the lower portion of the jaws so that cutting edges thereof form a profile of the workpiece cross-section. The cuttes disposed on the same jaw are pivotally connected with each other. The mechanism for pressing the cutters is constructed in the form of a system of hydraulic cylinders mounted on the jaws in symmetrical relationship relative to the vertical axis of the body. Said hydraulic cylinders are provided with rods operatively connected to corresponding cutters.

Abstract: The apparatus comprises a current transformer coupled to the welding tranrmer primary and connected with an analog transmitter of the welding current and with a digital transmitter of the duration of short-circuits in the welding circuit, having a memory element at the output.

Abstract: Shapes with circular corrugations are produced by spinning a sheet metal blank under the action of oppositely directed deforming and backing forces. The blank is given the configuration of an envelope of revolution with a continuously diverging flare and is secured at the end nearest to the geometrical apex of the flare, and the circular corrugations are formed sequentially from the smaller towards the larger diameter by applying a concentrated deforming force to the inside surface of the blank, the deforming force being directed along the blank axis.

Abstract: The invention provides a method for electroslag welding of light metals, which includes establishing a slag bath, fusing an electrode and edges to be weld-joined, and filling with molten metal the gap between the edges, the weld metal being held in a liquid state after switching off the welding current with concurrently increasing the slag bath heat capacity.The method employs a flux of the following composition (in wt. %):______________________________________ barium fluoride 60.0 to 90.0 calcium fluoride 5.0 to 15.0 lithium fluoride 1.0 to 5.0 sodium fluoride 1.0 to 10.0 potassium fluoride 1.0 to 15.

Abstract: A method for electroslag welding of metals by a large-section electrode includes establishing a slag bath, fusing the electrode and the edges being weld-joined, filling with molten metal the inlet metal mould and the gap between the edges, and subsequently removing the inlet shrinkhead. The electrode is, in establishing the slag bath and filling with metal the inlet metal mould, fused at a rate lower than the electrode fusion rate in filling with metal the gap between the edges being weld-joined at constant electrical parameters of the electroslag welding. A brittle interlayer is formed between the inlet shrinkhead and the weld in the course of welding, and the weld is made so that it has a low electrical resistance.

Abstract: 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.

Abstract: 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.

Abstract: The parts to be welded together are caused to continuously approach each other and their ends are fused by an alternating current, and concurrently an oscillatory motion along the direction of approach is imparted to one of the parts, whereby additional relative movements of the parts towards and away from each other are accomplished. During the stage of a relative movement of the parts being welded together away from each other, the welding voltage is reduced to within the range of 0.7 to 0 of its working value, and during the stage of a relative movement of the parts towards each other, the voltage is restored to its initial value. Reducing the voltage is carried out in a time interval of not less than 1/8 of the period of the oscillatory motion from the beginning of the relative movement of the parts away from each other, and restoring it, in a time interval of not more than 1/8 of the period of the oscillatory motion from the beginning of the relative movement of the parts towards each other.

Abstract: The primary winding of a welding transformer is provided with controlled rectifiers and the primary winding of a current transformer. The secondary winding of the current transformer is connected to a welding current pick-up. The phase angle of opening of the controlled rectifiers is varied through a phase shifter and a programmer. A pulse shaper is provided for shaping pulses synchronized with the voltage of a supply circuit and has an output connected to a phase delay unit. An OR circuit is provided having inputs connected to the output of the welding current pick-up and to one output of the programmer, and an output connected together with the output of the phase delay unit through AND logical circuits and an inverter to the inputs of a voltage switching flip-flop having outputs each being connected in pair with another output of the programmer through additional AND circuits to corresponding inputs of the phase shifter.

Abstract: A plasma-arc furnace comprises a casing with plasma torches, particularly ree torches, mounted therewithin in symmetrical relationship relative to the vertical axis thereof. Each of these torches comprises a body provided with a nozzle and an axial conduit for feeding a plasma-forming gas therethrough, and a cylindrical electrode disposed within said conduit. According to the invention, the distance between the centers of working ends of electrodes disposed within adjacent plasma torches is not more than 15 diameters of the electrode.

Abstract: A method for electroslag welding of metals whose density is less than that f welding fluxes, is provided. The method is based on floating-up of drops of molten metal of the edges being welded and of the electrode in a slag whose density exceeds that of the metal. The floating-up metal drops form a metal bath on the surface of the slag bath, and crystallization of the metal bath produces a weld. In the course of welding, the electrode metal is fed into the slag bath in the upward direction, while the electrode metal melts and the weld is built up in the downward direction.