Abstract: A method of manufacturing thermal barrier structures comprising at least three dimpled cores separated by flat plate material with the outer surface of the flat plate material joined together by diffusion bonding.

Abstract: A weld attachment device and method are disclosed for effecting resistance welding connections through an insulating layer to a metallic substrate without necessarily having access to the rear surface of the substrate. The apparatus comprises a spaced parallel pair of weld pins supported on an electrical insulating carrier, the device being attached by advancing the tips of the pins into contact with a metal substrate and passing welding current through a circuit defined by the metal pins and the area of the substrate between the pins.

Abstract: A large cylindrical structural element is manufactured by welding together a pair of thick-walled cylindrical components at their ends by applying between the cylindrical components at least one buffer layer of weld material, the buffer layer being applied by a welding electrode held with its axis maintained at an angle to the plane of abutting surfaces of the components with the at least one buffer layer being applied in the form of weld beads which overlap and subsequently applying an assembly weld seam to join the components together.

Abstract: A method for arc welding a very low carbon steel containing 0.005-0.06% C characterized by employing a welding material with nickel together with high carbon so as to form weld metal containing nickel. Solidification cracking on the thus welded metal can be prevented.

Abstract: A welder utilizes a focussed electron beam which is deflected along the processing path required to weld two pieces together and is also oscillated about the processing path in accordance with a modulation curve. The modulation curve is approximated by a sequence of points. The coordinates of the points in a predetermined coordinate system are read out sequentially from a digital storage and converted to analog signals. The analog signals are subjected to low pass filtering and then applied to the deflection system for the electron beam. The cut-off frequency of the low pass filter is a predetermined multiple of the readout frequency of the digital data. When the velocity of the beam along the modulation curve changes, the cut-off frequency and the readout frequency are adjusted simultaneously. Additionally, the position of the focus and/or the intensity of the electron beam can be varied as the beam traces out the modulation curve.

Abstract: Device and method for welding nuclear fuel assembly structural elements, comprising a receiving stand for the guide tubes and structural elements of the assembly, and a welding group having a carriage movable parallel to the guide tubes comprising at least one welding gun united on the carriage by means enabling it to move parallel to a row of guide tubes and to rotate between an orientation in which the gun can pass between two adjacent rows of guide tubes and an orientation in which it comes to grip a tube at the location of the proposed weld, electrical welding pulses being applied to the guns.

Abstract: The outer surface of a butt-welded joint is build-up welded such that a ratio h/t is higher than approximate 0.2 and a ratio L/.sqroot.Rt is higher than approximate 1, where h denotes height of a build-up welded portion; t, wall thickness of a pipe; L, width of the build-up welded portion; and R, radius of the pipe. As a result, the residual stresses in the build-up welded portion counterbalances the residual stresses in the welded joint, whereby the residual stresses at the inner surface of the welded joint can be relieved.

Abstract: A portable machine is disclosed for setting eyelets and the like in printed circuit boards and includes an upper tool connected to a mandrel mounted in a frame and movable into and out of engagement with a lower tool by a toggle means. The lower tool is resiliently mounted in the frame beneath the upper tool and has a support structure beneath it which includes a slidable pressure control means for predetermining the maximum setting pressure applied to a workpiece by the upper and lower tools.

Abstract: Method for gas metal arc welding of very low carbon steel in which a crack-free region where high temperature cracking does not occur is obtained by controlling the carbon content of the weld metal.

Abstract: The invention relates to a hand-held welding device capable of diffusion bonding or welding to compatible metal surfaces a variety of materials including wire, metal strips, component leads, and other suitable metallic objects. The device is formed with a tubular housing in which are mounted an adjustable, outer electrode assembly and an adjustable, inner electrode assembly, the outer electrode assembly being arranged to have interchangeable, contact-probe members, and the inner electrode assembly being positioned coaxially within the outer electrode assembly. Each electrode assembly is spring-biased, the biasing force of each spring being independently adjustable to provide an optimum bonding pressure on the workpiece and the proper engagement of a pressure-sensitive switch to activate the current pulse of a power-supply unit.

Abstract: The automatic welding machine has a pair of closely spaced magnetic rollers which grip the surface of a workpiece and which are driven to rotate the workpiece. The workpiece may rest on a support on the end of a double articulated arm. The driven rollers are adjustably mounted on a standard. The standard also mounts a carriage including a welding gun. The carriage is movable toward and away from the workpiece under the urgings of a probe which is mounted on the carriage with the gun and which travels over the surface of the workpiece as it rotates.

Abstract: A method of forming a continuous laser butt weld between two members is disclosed. The method comprises providing two members to be butt welded, positioning respective edges of the members in abutting contact with the two members being canted slightly with respect to one another so that the butt joint formed by the edges is open toward a first side of the member, with the edges contacting one another toward a second side of the members opposite the first side, and directing a high energy density laser beam at the butt joint from the first side of the members so that at least a portion of the laser beam extends into the open side of the butt joint to the edges, while urging the edges of the two members in the direction of the butt joint for butt welding the members.

Abstract: A method and a device for performing spot heating of a body, particularly for brazing hard solder gold alloys. In said method an article, for example of a hard solder gold alloy, which is to be heated to a predetermined temperature, is positioned in the focal point of one or more reflecting partial ellipsoids, in whose other focal point or focal points, respectively, an appropriate lamp, for example an IR lamp, is disposed. The radiated heat of the IR lamps causes the article to be heated rapidly and intensely. Temperature control can be carried out subjectively by observing the melting of the solder through a window or alternatively by means of a thermocouple connected to the article. The device of the invention comprises a chamber having an airtight glass cover. On top of this a heating unit is placed consisting of one or more ellipsoid-shaped casings each having an IR lamp in its focal point.

Abstract: A guide tube for guiding a wire (23) of filler metal in an arc welding machine and for applying arc current thereto comprises a metal body (80) having a longitudinal bore (82) through which the wire passes. Near the front end of the tube there are two transverse passages (95) housing respective ball (96) which are urged to project into the bore by respective spiral compression springs (97). These serve to keep the wire pressed against the opposite side of the bore to maintain good electrical contact. The springs are held in by a sheath (100) fitted over the end of the tube. The sheath also serves to keep an end piece (50) in place. Both the sheath and the end piece are made of refractory material which is electrically insulating and which is non-adhesive to spattering metal from the weld melt. This helps to prevent the front of the tube getting clogged up in operation.

Abstract: A laser shielding device is disclosed, having two spaced-apart layers of shielding material defining a sealed chamber between the two. At least one layer will degrade in the presence of an impinging laser beam, creating a hole through the layer. A pressure change in the chamber is sensed and signaled to a machine controller to stop the lasing operation.

Abstract: An electron gun with a beam generator 4, a high-voltage connection 25 and a high-voltage insulator 23 is equipped with at least one insulating transformer 26, 27 and circuit elements 43 for producing auxiliary voltages at high-voltage potential. The beam generator 4 and the high-voltage insulator 23. are surrounded by a grounded metallic jacket 32. The insulating transformer is arranged above the high-voltage insulator 23. For the purpose of solving the problem of permitting use of a single-pole high-voltage cable, the one or more insulating transformers 26, 27 are embedded in an insulating member 24 which is mounted directly on the high-voltage insulator 23. The portion of the insulating member 24 that projects beyond the grounded jacket 32 is surrounded by a metallic hood which, together with the jacket 32, forms a common Faraday cage. The circuit elements 43 for the auxiliary voltages are likewise arranged in the Faraday cage.

Abstract: A method and apparatus for high speed welding are disclosed wherein a continuous weld is formed at high speed along a member with a plurality of overlapping welds formed by pulses of high density energy from a pulsed high energy density welding device such as an electronically pulsed gas laser. The movement of the member being welded is detected in the vicinity of the pulsed laser. The pulsed laser is controlled in response to the detected movement so that the energy for welding from the pulses per unit length of the member being welded is accurately controlled. The control of the laser involves pulsing of the laser in response to the detected movement of the member so that the pitch of the overlapping welds along the member is substantially constant. Also, the power of the laser pulses is controlled and adjusted in a predetermined manner in response to the detected movements.

Abstract: In a submerged arc multiple wire welding system, only one or two of the welding wires used are over or microalloyed wires. The other wires are commercially available unalloyed or low-alloyed solid wires. The process produces a weld metal which has unexpectedly high toughness values, and can be performed more economically. This multiple wire welding system is used in single or multiple-pass welding operations.

Abstract: Described herein is an invention that belongs to the technical field of machines for effecting lap welding operations and relates, in particular, to a device for positioning the metal ends of strips destined, once the said ends are joined one to the other, to constitute can bodies.Envisaged by the invention is a device in which the slots for housing the ends to be welded are defined by at least one pair of guide blocks that are substantially opposed and are shaped in the form of a step in such a way that each constitutes means of abutment for one of the said ends and supporting surfaces for both of the said ends. Advantageously, at least one block in the said at least one pair of blocks can be set with respect to the other.

Abstract: There are disclosed flux cored wire electrodes for self-shielded arc welding which comprise a steel sheath filled with a powdery flux containing as essential components thereof the following components set forth in terms of weight percentage: BaF.sub.2 (25-70), alkali metal fluoride (1-30), compound oxide composed of the oxide of an alkaline earth metal selected from among Ca, Sr, and Ba and the oxide of a metal selected from among Fe, Mn, Ni, Co, Ti, Al and Zr (1-30), Al (3-12), Mg (2-10) and Mn (0.5-10).