Abstract: A weld and process for making same and usable in the arc-welding of cupro-nickel (ASME P.34) parts particularly pipe ends using a flux-coated stick electrode, characterized in that an "open V" butt weld is employed with a root face having a mean width greater than 1/16 inch (1.5 mm) and not greater than 1/8 inch (3.2 mm) and a root gap from 2 to 3 mm. The process is further characterized in that the welding is carried out solely from the open side of the V without employing additional inert gas shielding, backing material or subsequent welding at the reverse face.

Abstract: A method and an apparatus for clearing burrs from products fabricated from metal stock. The burr of a product is used as one electrode, and another electrode is formed by extending an electrode material along, and apart from, the burr. A voltage is applied across the electrode to generate an arc between them. In the meanwhile, a magnetic field having a magnetic flux flow crossing the arc is formed to drive the arc along the burr by an electromagnetic force whereby the burr is melted and removed from the product.

Abstract: A method of welding the ends of submerged pipes in a gaseous atmosphere at any depth comprises isolating the ends of the pipes by introducing obturators therein and then introducing the pipe ends into an open topped receptacle which is capped with an underwater personal carrying intervention unit. The closed receptacle is filled with gas and then a sleeve is positioned between the ends of the pipes and welded to the pipes.

Abstract: The invention concerns a process for the final assembly of a nuclear reactor vessel comprising two sub-assemblies which are brought together and welded along mating surfaces. At least three female centering stubs, each associated with a seat recessed relative to the outer surface of the stub, are provided on the mating surface of one of the sub-assemblies, and at least three male centering stubs, corresponding to the seats of the female stubs, are provided on the mating surface of the other sub-assembly, the positions of the stubs being registered relative to elements for positioning internal fitments of the vessel. The two sub-assemblies are brought together to engage the male stubs in the female stub seats and to bring projecting annular ridges on the mating surfaces into contact. A key is inserted into a socket defined by one of the pairs of stubs and the stubs are then joined to each other by point-welds.

Abstract: Pipes are submerged - arc seam welded with a welding wire having a relatively high nickel content (about 6%), and low carbon content (<0.08%) to obtain a seam having a ductility and toughness which is still adequate for very low temperatures.

Abstract: Method and apparatus for double jointing pipe, wherein a first pipe section is moved onto a pipe support roller assembly and moved lengthwise over a boom which carries a pipe clamp and internal welder at its end. A second section of pipe is then moved onto the pipe support roller assembly and moved lengthwise into engagement with the first pipe section. After the first and second pipe sections have been properly aligned and the clamps expanded to hold the pipe sections in welding positions, the pipe sections are rotated simultaneously while both internal and external welds are made simultaneously. A cap weld may also be formed with the pipes clamped as described, or the pipes may be moved to another support roller assembly and the cap weld made while the connected pipe sections are on the second support roller assembly. The methods and apparatus disclosed result in considerable savings as to both the cost of equipment and operating costs.

Abstract: Apparatus and method for rapid and automatic welding of joints which interconnect sections of pipe, and in particular oil or gas transmission pipe. The system includes at least one torch transport assembly which simultaneously moves one or more welding torches along a path parallel to the joint being welded. Selected operating parameters such as preheating power for the filler wire, of each welding torch are adjusted to accurately position each torch with respect to the joint, and to repeatably provide programmed welding parameters resulting in a uniform joint weld. The present system is disclosed in the context of hot-wire gas-tungsten arc welding torches.

Abstract: A method for manufacturing a gas turbine combustion chamber that preserves cooling fluid holes therein. Passages are formed in one surface of each of two metal sheets. A plurality of cooling fluid holes are drilled through the passages to the other surface of each sheet. The two metal sheets are abutted face-to-face so that their respective passages form channels and the sheets are thereafter brazed together. The brazed sheets are bent to form an annular shaped chamber having a butt joint running along the length of the chamber. The butt joint is electric-arc welded along each side of the same, there being only partial penetration by each weld thereby avoiding the filling in of any of the cooling fluid holes, in the line of the weld, with melted material.

Abstract: Methods and apparatus for the welding and heat treating of metal parts in which an electric arc extends between a pair of adjacent metal parts or between an electrode and one or more metal parts with the arc traversing the metal part or parts a plurality of times during the heating cycle. For finite length metal parts, i.e. when the surface or surfaces to be heated do not provide closed paths to be followed by the arc, the arc is initiated, caused to follow the surface, extinguished and then reinitiated, or is caused to traverse the surfaces in alternately opposite directions after initiation. With finite length metal parts, run-off tabs are provided at the ends of the surfaces to prevent overheating at such ends. A magnetic field causes the arc to traverse the surfaces and may be modified in strength or distribution to vary traverse rate.

Abstract: Disclosed herein is an improvement of a welding process for welding a steel pipe, wherein a gas metal arc welding is performed to form the first welding layer and a submerged arc welding is performed to form the last welding layer. According to the conventional gas metal arc welding process, i.e. the MIG or CO.sub.2 welding processes, the combined use of a high welding current and a welding wire having a small diameter is known to bring about the rotation of the welding arc and the formation of an undercut along the toe of the weld metal. The purpose of the present invention is to weld a steel pipe having either a large thickness or an excellent ductility at a temperature of less than -40.degree. C., or both. According to the present invention, the combined use of a high welding current and a wire having a small diameter is possible, by employing a gas mixture containing an inert gas as a major part thereof and CO.sub.2 as an additional part thereof as a shielding gas.

Abstract: The specification discloses a method and apparatus for assuring the integrity of outside weldings of pipelines. Pipe sections are prepared for welding by forming a beveled profile with a relatively narrow annular contact band on the ends of each pipe section. When the pipe sections are abutted end to end for welding, the leveled profiles form a relatively deep groove on the outside of the pipe between the pipe sections, with the annular contact bands abutting and spaced inwardly from the grooves. The contact band on at least one of the pipe sections is circumferentially prepared such as by knurling to provide controlled spacing between the contact bands of the pipe sections. A welding arc is applied to the bottom of the groove from the exterior of the pipe sections to weld the annular contact bands together. Welding penetration is enhanced by the circumferential preparation of the contact bands.

Abstract: In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the GMA welding process which comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one cable as the welding current, at least two even-numbered consumable electrodes are used, half of said consumable electrodes being connected to said direct current so as to be positive in polarity and the remaining half of said consumable electrodes being connected to said direct current so as to be negative in polarity, to enable lines of magnetic force produced by said direct electric current for welding flowing through said at least one cable introduced into said pipe-blank to cancel each other, thereby preventing magnetization of said pipe-blank and the resulting magnetic arc blow of the welding arc.

Abstract: Methods and apparatus for the welding and heat treating of metal parts in which an electric arc extends between a pair of adjacent metal parts or between an electrode and one or more metal parts with the arc traversing the metal part or parts a plurality of times during the heating cycle. For finite length metal parts, i.e. when the surface or surfaces to be heated do not provide closed paths to be followed by the arc, the arc is initiated, caused to follow the surface, extinguished and then reinitiated, or is caused to traverse the surfaces in alternately opposite directions after initiation. With finite length metal parts, run-off tabs are provided at the ends of the surfaces to prevent overheating at such ends. A magnetic field causes the arc to traverse the surfaces and may be modified in strength or distribution to vary traverse rate.

Abstract: A method of connecting metallic parts, and metallic parts so produced, by means of arc fusion welding by producing a low volume welding seam (narrow gap welding), wherein the workpiece parts to be jointed and forming a narrow gap are initially welded at their butt joint by means of, for instance, electron-beam welding, plasma-arc welding, laser-beam welding or argon arc-welding to produce a base seam with or without filler material, and thereafter the workpiece flanks forming the narrow gap are united by alternately depositing weld beads at first one and the other workpiece flank by submerged-arc welding.

Abstract: A method for butt welding pipe sections together wherein each pipe section has a beveled end includes positioning the pipe sections adjacent one another so that the beveled ends define a weld groove and locating filler material of elongate dimension having a triangular cross-section so that an edge portion thereof protrudes through the weld groove. The filler material is fused to the weld groove by striking an inert gas-shielded arc between a Heliarc torch electrode and the beveled ends and advancing the electrode relative to the filler material so that a weld bead is formed having a convex profile on the interior surfaces of the pipe sections adjacent the weld groove.

Abstract: A method for assembling successive ducts end to end with a pipe-line constituted by the assembled ducts comprising: providing inner equipments for said ducts each comprising means for vacuum-tight connection with the inside of a duct and means protruding from the duct for vacuum tight connection with the pipe-line; placing said inner equipments in each successive duct in an equipping station, connecting said equipment to the inside of the duct at both ends to close an inner vacuum tight space inside the duct; connecting said space to pumping means and evacuating said inner space by said pumping means while transferring said duct and inner equipment from said equipping station to a welding station; positioning said duct in alignment and abutment end to end with the pipe-line in said welding station; locking the duct in fixed position with respect to the pipe-line, sealingly connecting said equipment with the pipe-line inside the pipe-line, and sealingly connecting a vacuum tight welding chamber of a rotative w

Abstract: A weld joint configuration facilitating the connection of two closely positioned workpieces having spaced apart end surfaces comprising sidewalls of a weld joint space. One of said workpieces has a tongue projecting therefrom that is received at least in part in a groove formed in the other of the workpieces. The interface between the tongue and a surface of the other workpiece partially defining the groove comprises a weld joint parting line. An extension projecting from at least one of the workpieces provides workpiece material located between this parting line and the weld joint space. When the workpieces are welded electrode material and the extensions are mixed to form a composite weld having a root portion with a parting line extending substantially tangentially from the root portion.

Abstract: Tapered stainless steel spool pieces are welded to the ends of stainless steel pipe lengths at the factory to provide subassemblies which are then annealed and thereafter in the field are positioned with the larger free ends of opposed spool pieces disposed to receive weld metal uniting the subassemblies while coolant liquid is maintained in contact with the inside surfaces of the spool pieces.

Abstract: An apparatus for welding the adjoining ends of annular work members, such as lengths of pipe, employing an arc nozzle for melting and depositing metal in the gap between said adjoining ends. A drive motor coupled to the nozzle drives the nozzle laterally back and forth across the gap while the current that flows in said arc is integrated to generate a physical representation of magnitude of the integral. Means are provided to arrest the motor each time the magnitude reaches a predetermined threshold value, and to reverse the direction of travel of the motor.

Abstract: In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the metal arc welding process which comprises using direct electric current supplied to a plurality of consumable electrodes in tandem through at least one current supply cable as the welding current, an even number of consumable electrodes are used; half of said even-numbered consumable electrodes are connected in the reverse-polarity manner, i.e., to be positive in polarity, and are used as leading electrodes, and the remaining half are connected in the straight-polarity manner, i.e.

Abstract: A method for butt welding a pair of vertically disposed tubular members having a wall thickness of more than 12 mm in end-to-end relationship by multi-pass shielded arc welding with a consumable electrode, comprising the steps of preparing the opposed edges of the tubular members by forming a root face the width of which being in the range of 0.5 mm to 3.0 mm and beveling the edges adjacent to the root face to a bevel angle in the range of 40.degree. to 50.degree., coaxially aligning said tubular members so that the gap between the root faces is not larger than 1.5 mm, performing a root pass by continuously feeding an electrode having a diameter not larger than about 1.

Abstract: After longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the arc welding process which comprises using direct electric current supplied to a consumable electrode through a cable as the welding current, the polarity of said consumable electrode applied for said longitudinal seam-welding is switched over to the opposite polarity, an arc from said consumable electrode is ignited again on a tab plate attached to the end of said pipe-blank on the completion side of said longitudinal seam-welding to cause a direct electric current for eliminating magnetism to flow through said cable in the opposite direction to that of said direct electric current for welding, thereby eliminating residual magnetism in said pipe-blank produced by said direct electric current for welding flowing through said cable introduced into said pipe-blank during said longitudinal seam-welding.

Abstract: A method and apparatus for preheating filler material to a temperature approaching its melting point prior to deposit within a weld zone. The weld zone and deposited filler material are then heated sufficiently to form an integral weldment. The power imparted to preheat the filler material is automatically, programmably, controlled as a predetermined function of the filler material deposition rate to obtain smooth melting of the filler material within the weld zone at any given filler material feed speed.In an application to welding an extended seam along a workpiece wherein the weld zone is moved along the seam, the power employed to heat the weld zone and the filler material feed speed are additionally controlled as a function of the speed of movement of the weld zone along the seam.

Abstract: Wheel rim blank manufacturing apparatus comprises an elongated mandrel passing through Coiling, Welding and Machining Stations. Flat stock is fed transversely for coiling to cylindrical rim blanks about the mandrel. A transfer slide advances and maintains orientation of coiled rim blanks from the Coiling Station to the Welding Station. At the Welding Station clamps secure the blanks for resistance or high frequency current penetration welding. Internal clamps at the Welding Station have small shoulders for transferring the blanks past a Machining Station where a scarfing tool engages their welded areas. The method includes feeding stock transversely, coiling about a mandrel, advancing blanks along the mandrel, welding, again advancing the blanks, and machining weld areas.

Abstract: Apparatus is disclosed for supporting and rotating a pair of hollow tank sections of generally circular cross section, including scalene frusto-conical tank sections, during welding of the sections in end-to-end abutting relation to form an elongted tank. The apparatus includes three longitudinally spaced, axially aligned, rotatable rings which define a welding cage. The center ring includes a plurality of circumferentially spaced, radially directed jacks, each extendible the same distance regardless of the resistance encountered by a particular jack to force the abutting edges of the tank sections into a precise circular cross section and support and hold the abutting edges in aligned relation during rotation and welding.

Abstract: In a method for the manufacture of substantially cylindrical pressurized or liquefied gas tanks first and second portions deformable to open-ended cylindrical shape are stamped out of a same metal sheet, the cylindrical portions then being welded together by their free edges which mated in the sheet. A machine for automatically carrying out the method comprises means for stamping, shaping and assembling the portions.

Abstract: A method of welding a pipe to a pipe plate conprises slipping a ring over the pipe, the adjoining surfaces of the ring being in contact with the pipe surface and with the pipe plate surface over the entire circumference, inserting the pipe end over a short distance into a bore in the pipe plate, rolling the end of the pipe against the bore wall whereby a clamping contact between the pipe end and the bore wall is achieved and welding the pipe end to the pipe plate with the aid of a nonconsumable electrode under conditions that only a portion of the cross section of the ring melts. It is preferable, after welding the end of the pipe within the interior of the bore to melt completely the ring and to achieve a second weld joint. In this last step, one or more circular welds between the pipe end and the inner surface of the bore are made.

Abstract: In the preparation of plane or curved workpieces for welding together by means of an electron beam and wherein the weld takes the form of a full penetration joint, fusion lips are provided at the place where the lower welding bead forms. In the case where the workpieces are constituted by rotationally symmetrical thick-walled hollow bodies such as rotor discs for construction of turbo-machines which upon welding together form a closed cavity, the fusion lips have an annular configuration and are located at the inner radial contour of the welding interface. The workpieces are also provided with an arrangement for centering the lips and a metal foil is inserted between the lips to improve the toughness of the weld material, the foil having a carbon content lower than that of the parent metal of the workpieces.

Abstract: Welding connector comprising a housing, means for accommodating an electrode, an insulating cone for fitting within a conical passage, and magnetic means for securely fitting such cone to such passage. Method of passing electrical current from outside a metal pipe to inside thereof.

Abstract: The stress corrosion tendency of a welded pipe in service in a nuclear reactor water line is reduced by applying to the outside of the pipe a secondary weld bridging the primary weld of the joint beyond the axial extremities of the primary weld heat affected zone and particularly that part of the zone at the inner surface of the pipe.

Abstract: A method of manufacturing a thick, high-strength steel pipe for low temperature service comprising the steps of forming into tubular shape a steel plate having a thickness of over 12 mm and a specific composition, of which the C.sub.eq value is adjusted to less than 0.50, when the Mn content is less than 1.0 % whereas the C.sub.eq value is adjusted to less than 0.45 when the Mn content is over 1.0 % and less than 2.0 %, and nextly of welding said tube form at high speeds and high efficiency by the process of single electrode or multiple electrode large-current gas-shielded arc welding with one pass per electrode on each side of the seam at a specific condition, each electrode preferably consisting of a solid wire essentially containing less than 0.3 % Ti with or without the addition of less than 0.

Abstract: In the production of longitudinally welded pipes, the metal strip is treated with a chemical deoxidizing agent, such as a hydrazine compound, to remove oxides from at least the strip edges, prior to arc welding, to provide an improved weld.

Abstract: An end plug is formed by heat-sealing or welding a V-shaped section cut from the wall of a first pipe to a complementary shaped butt end of a second pipe.

Abstract: Apparatus for welding parts, such as pipes, end to end by means of an electric arc which is caused to rotate along the adjacent edges of the pipes. Two separate magnetic fields are used to cause the arc to follow a spiral path along the edges so that pipes having a wall thickness greater than one quarter of an inch may be welded.

Abstract: Automatic fixed position pipe welding is carried out by gas-shielded electric arc welding with a novel flux-cored electrode wire having a low-carbon sheel sheath containing a core filling of, by weight, 16-17 percent ferro manganese, 10-11 percent ferro silicon, 1-4 percent manganous oxide, 1/2-1 percent potassium aluminum fluoride, and the balance rutile. The wire exterior is shiny and metallic-appearing, and the wire is configured to have folded-in edges.