Abstract: In order to join a tube to a tubesheet of a heat exchanger, the end of the tube is inserted into a socket at the end of a hole that passes through the tubesheet. The socket is large enough to receive the tube, but the hole is not, so the tube bottoms out in the socket and is thus located both radially and axially by the socket. A ring mold is fitted around the tube and moved against the tubesheet, so that its end fits into an annular groove that surrounds the socket in the back face of the tubesheet. The ring mold has a chamfered confining surface that surrounds the tube where the tube emerges from the socket. Once the ring mold is in place the portion of tube that is within the socket is welded autogenously to the tubesheet by rotating an electrode within the hole. The molten weld metal flows outwardly to the confining surface, but is prevented by that surface from flowing circumfentially, even when the welding is performed with the tube in a horizontal position.

Abstract: In an electro-discharge machining method for progressively conducting precise machining through relative approach movements between an electro-discharge machining electrode and a workpiece in the horizontal direction substantially perpendicular to a direction in which said electrode is opposed to said workpiece, the method comprises a step of dividing a movement region of said relative approach movements into a plurality of sections within the horizontal plane and a step of selecting trajectories of said relative approach movements for the respective sections for successively and progressively achieving the machining.

Abstract: A method of welding ferritic stainless steel to austenitic stainless steel to form a corrosion-resistant welded article having a stabilized weld joint is provided. The ferritic steel contains 17 to 35% chromium and a total carbon and nitrogen less than the total carbon and nitrogen of the austenitic steel containing 16 to 29% chromium. The weld is stabilized with up to 4% stabilizer selected from the group consisting of titanium and columbium, and at least 0.5% stabilizer when the weld deposit contains at least about 22% chromium or at least 30% total of chromium and three times the molybdenum content, and at least 0.8% stabilizer for less than about 22% chromium or less than about 30% total of chromium and three times the molybdenum content. The source of the stabilizer may be the ferritic steel or austenitic steel or a weld filler metal.A corrosion-resistant welded article produced by the method is also provided, such as a ferritic stainless steel tube and austenitic stainless steel tubesheet.

Abstract: A kit for adapting tungsten-inert-gas welding torches of conventional design to use high amperage current. This comprises an internally and externally screw-threaded tube of highly conductive heat-resistant material which is designed to screw onto a cable housing terminal on the torch body, an insulating gasket which seats against an external shoulder of the torch body, and an insulating sleeve which fits over the internally and externally screw-threaded tube in place on the cable housing terminal, and seats against the gasket. This combination provides gripping means for the operator of the welding torch while dissipating the heat generated by the high operating current.

Abstract: A metal deposition process and apparatus is used to surface materials and includes a power supply connected to electrode wires and to the workpiece to establish a wire arc between the electrodes and a substrate arc between the positive electrode and the workpiece.

Abstract: Multiple movable support members positioned to shape transverse elements about multiple longitudinal elements, each support member supporting an electrical welding member and a shaping member which, upon movement of the support member, simultaneously shapes a transverse element about a longitudinal element and welds the transverse element to the longitudinal element.

Abstract: A rotary arc-welding apparatus which comprises: a rotatable nozzle having in its interior thereof a passage for directing a consumable welding electrode eccentrically from the center axis of the nozzle toward a groove formed between objects of welding; a consumable welding electrode feeding mechanism for continuously directing the consumable welding electrode toward the groove through the nozzle; a welding current feeding mechanism for feeding a welding current to the nozzle, which comprises a current receiving plate fixed to the top end of the nozzle, a brush having on the upper surface thereof a current feeding plate, the brush and the current receiving plate having a flat contact interface therebetween, a plurality of rods for stationarily holding the brush and the current feeding plate, and a plurality of springs for applying a pressure onto the contact interface between the brush and the current receiving plate; a nozzle rotating mechanism for rotating the nozzle about the center axis thereof at a high s

Abstract: A transfer member is provided for welding apparatus wherein fluid is deposited about the weld area during the welding process and T-studs are automatically fed from a remote source to a welding gun. The transfer member comprises two tubular members, one disposed within the other, and sealed one from the other. Studs are transferred through the inner tubular members and fluid, in the form of gas or liquid, is transferred through the outer tubular member.

Abstract: Disclosed herein is a fluid baffle assembly suitable for use in water-cooled welding or cutting torches for providing a fluid passageway for efficient cooling of the torch head. The baffle assembly is comprised of a thin arcuate baffle member held in compression within the cylindrical outer sleeve of the torch head and about the inner body portion of the torch head so as to bifurcate the upstream portion of the water cooling area between the sleeve and the outer body portion of the torch head into separate water inlet and outlet channels. The inlet and outlet channels terminate at the lower end of the baffle in an annular water cooling chamber and at their upper ends communicate with water inlet and outlet tubes so that cooling water can flow from the inlet tube down the inlet channel, about the lower portion of the torch head in the annular water cooling chamber and out the outlet tube via the outlet channel.

Abstract: Methods and apparatus for manufacturing tapered, hollow metal poles which can be used for manufacturing poles of various lengths, tapers and cross-sectional dimensions with the same apparatus. A substantially complete, tapered tube is formed from a plate or sheet of metal having lips at its longitudinal side edges which extend transversely to the major surface of the plate or sheet. The tube is guided at its lip portions to a weld point where pressure is applied to force the lips together by a grooved roller which applies pressure to the oppositely facing surfaces of the lips in directions transverse to such surfaces. The lips are spaced in advance of the weld point, and high frequency, electric heating current is supplied to the tube at opposite sides of the gap between the lips to heat the tube at the lips to welding temperature as it is advanced to the weld point.

Abstract: In apparatus for repairing printed circuit lines or attaching electrical components, a pair of brazing electrodes and holder therefor in which the electrodes can be repetitively extended to compensate for wear without necessity of removal and machining heretofore required. The holder is a part of the circuit delivering electrical power to the electrodes and makes contact with the electrodes close to the working tip to maintain uniform circuit resistance and repairs of consistent quality.

Abstract: A three o'clock welding method in a narrow groove, wherein a lateral butt welded joint is formed by carrying out welding in a narrow groove. The narrow groove is inclined with respect to the horizontal in such a manner that the center face of substantially parallel upper and lower groove faces is lowered on the initial layer side, when the welding is performed.

Abstract: A method of and apparatus for electroerosively machining a 3D cavity in workpiece, in which a coil is wound on a tool electrode and energized by a current source to produce a magnetic field therein. The magnetic field of flux density in excess of 100 Gauss and preferably not less than 300 Gauss is passed through the ferromagnetic electrode body and applied to the machining gap formed between the tool electrode and the workpiece which are relatively displaced multiaxially under commands of a NC unit to cause the frontal end portion of the tool electrode to sweep in a scanning manner over the workpiece while following a prescribed 3D path to progressively develop the desired cavity electroerosively machined with a succession of electrical discharges affected by the magnetic field.

Abstract: In a resistance welding device wherein the welding gun is carried by a robot for rotation about a robot axis, an electrical slip ring assembly for carrying weld current to the weld gun also supports the rotary weld gun. Axially stacked collector discs insulated from one another are electrically and mechanically connected to separate bus members for connection to the weld gun and a pair of adapter plates for connecting the assembly to the rotary drive of a robot and to a weld gun respectively are all bolted together into a unitary rotary arbor assembly. Each collector disc presents a cylindrical outer surface and a nonrotating supply ring surrounds each disc and is connected to one terminal of a power supply. The supply rings are expansible and a fluid actuator operates each supply ring to clamp it tightly to its corresponding collector disc for good electrical connection and to release the ring from the collector disc to allow rotation of the arbor assembly.

Abstract: Grid bodies which consist of two parallel plane grid mats of longitudinal and transverse wires crossing one another and welded together at the points of cross, and of spacer wires, which hold the mats spaced apart and which are welded at each end to one wire of one of the two grid mats, are produced in a continuous method and in such a way that if necessary an insulating core may be introduced into the grid body during its production. For this purpose two widths (3,4) of grid matting are drawn off in steps from stock coils (1,2), straightened and arranged at a distance apart. Simultaneously a number of wires (22,23) are drawn off in steps from stock coils (20,21), straightened and introduced through one (3) of the widths (3,4) of grid matting from the side into the gap between the widths of grid matting, welded to one wire in each width of grid and separated from the wire stock.

Abstract: A flux retainer retains a granular flux upon a rotating cylindrical pipe to which a metal reinforcement layer is applied by a submerged arc welder. The flux container comprises a rectangular frame having a pair of end plates and a pair of side plates. Wheels are carried by the frame to support the frame upon the pipe surface as the pipe rotates. A pair of metal brushes are connected to the end plates and project therebelow to bear against the pipe surface and resist leakage of granular flux. The side plates each comprises a plurality of plate segments which are pivotably interconnected for rotation about an axis extending generally parallel to the pipe axis in order to change the angular relationship between the plate segments and thereby vary the distance separating the end plates. In this fashion, the flux retainer can be adapted to pipe diameters of different size.

Abstract: In order to be able to change, without problems, the characteristic of an intended force measuring device (95, 107 through 123) provided on an electrode mounting support (7), having an electrode holder (81), according to the electrode (105) being used, the mounting support has a mounting part (75) movably fixed to a conveyor carriage (5) of a solder or welding apparatus. Thereon is guided an electrode holder (81) by a ball piston/sleeve arrangement (89, 87) and by an additional piston/cylinder arrangement (87 through 89) acting in cooperation with an exchangeable pressure spring (95) of known characteristic. An inductive displacement pickup, integrated into the second piston/cylinder arrangement, including induction coil (119, 121) is provided on the surface of the cylinder and a ferrite core (125) for cooperating therewith is mounted in the piston.

Abstract: Means for making electrical contact with a pair of spot welding electrodes and workpieces engaged by the electrodes. The means includes two rigid insulating blocks for mounting on each electrode of an electrode pair. Each block has a first electrical conductor for physically engaging the electrode upon which it is mounted and a second electrical conductor for physically engaging an exposed surface of the workpiece the electrode will engage in a welding process. The electrical conductors extend in a direction substantially perpendicular to the electrodes when the blocks are mounted thereon. In addition, means integral with the blocks and conductors for respectively electrically connecting the conductors to a device for measuring the voltage drop between electrodes and between the exposed surfaces of the workpieces when welding current is applied to the workpieces by the electrodes.

Abstract: An improved flexible hose having particular utility for a fume extracting welding gun is described. The hose has a smooth outer surface, an inner cylindrical compartment which receives the power cable and welding wire and a plurality of radial webs which define compartments for extracting fumes and for conveying shielding gas to the welding site.

Abstract: A transformer for electric welders, especially welders having a welding gun secured to a robot arm, comprises a small lightweight loop core having first and second substantially C-shaped sections abutted together at their free ends with primary and secondary windings coaxially wrapped about one pair of abutting shanks. The secondary winding comprises an elongated flat sheet wrapped around abutting shanks of the core and has projecting tabs extending from opposite sides of the sheet. A primary winding comprising a plurality of coil sections is coaxially wrapped about the secondary winding whereby the secondary winding is substantially entirely coupled to the primary winding. The windings are encapsulated in a dielectric material such as a synthetic polymer resin. The transformer is preferably connected to a high frequency electrical power source.