Abstract: A method, system and apparatus of determining search parameters for welding seam point calibration. The method includes determining, for a seam vertex point on a welding seam, three reference faces which are perpendicular to each other, based on geometry of an object to be weld in a virtual model; and determining a start point and a search point of a search motion for welding seam point calibration based on the three reference faces and predetermined criteria respectively for the start point and the search point. Three reference faces can be extracted automatically, and search parameters needed for the search instructions can be determined based thereon which enables automatic generation of search instructions and thus the time, manpower and cost for the welding seam point calibration can be reduced greatly.

Abstract: A welding electrode apparatus has a base member and a locking ring for clamping a consumable electrode tip to the electrode base. The base and the tip are predominantly made of copper, or a copper alloy. The base member has a first end that is threaded to fit a welding head that supplies electric current; and an electrically conductive second end to which the electrode tip is mounted. The second portion has an externally facing, axially extending cylindrical wall. A circumferential groove is formed in the wall. The locking ring has a quick-disconnect feature in the form of an array of spring-loaded stainless steel ball bearing detents that deflect to ride upon the cylindrical wall, and spring inwardly to seat in the circumferential groove.

Abstract: A pipe joint includes a first member, a second member, a weld experiencing transverse contraction and joining a first outer cylindrical end portion and a second outer cylindrical end portion butted with their end faces meeting over the entire circumference, an annular sealed area produced by the transverse contraction of the weld causing a first pressing portion and a second pressing portion to be displaced toward each other, a heat transmission suppressing member arranged in a space delimited by a weld forming area and a to-be-sealed area, inside the first and second members assembled, to suppress transmission of heat applied in welding from the weld forming area to a to-be-sealed area, and a first stop ring fitted in an outer cylindrical surface of the heat transmission suppressing member to hold the heat transmission suppressing member against an inner surface of the first or the second member.

Abstract: A rotary robotic welding torch that enables the welding process in a robotic unit. The rotary welding torch allows for clockwise and counterclockwise rotation during the welding process, while being supplied with an uninterrupted supply of inert gas and electrical current. The rotary robotic welding torch may also be supplied with an uninterrupted supply of coolant and/or electrode/filler wire during the welding process.

Abstract: A method of continuously forming a dual seam welded tubular product includes the steps of providing two coils of sheet metal material, uncoiling the two coils and forming the material into opposing sections, bringing the two opposing sections together at a convergence angle of less than about 4°; and welding the two seams created between the two opposing sections. An apparatus is configured to bring the sections together at a convergence angle less than about 4° to produce the tubular product. The tubular product may have a diameter greater than 26 inches.

Abstract: A method for producing a metal sheet with a welded-on tube which has at least partially curved sections, wherein the tube is guided by at least one guide element onto the sheet, is pressed thereon with at least one pressure element and is welded thereto at least at some points and wherein the tube is bent to form the curved sections. In order to achieve the welding-on in a simple manner even in the curved sections, it is provided that a bending is carried out in a plurality of discrete steps, wherein in individual steps firstly the tube with the at least one guide element is bent around a last created welding point and thereafter a new welding point is created. Furthermore, the invention relates to a device for carrying out the method.

Abstract: A guiding and shaping system for producing welded pipes made from metallic strip material. The guiding and shaping system comprises several pairs of rolls that are disposed one behind another in the direction of travel of the workpiece and are used for increasingly cold-working and bending the edges of the workpiece as the workpiece advances. First pairs of rolls grip the top side and bottom side of the workpiece while pairs of rolls that grip the external faces of the bent edges and form the shape of a pipe are provided in the region where the bent edges form undercuts. The guiding and shaping system further comprises a welding device. The workpiece is supported by floatingly mounted lateral rolls until cooling off following the welding process.

Abstract: The present invention provides a method and device for inductively heating a first and second surface to form a closure assembly. A method contemplated by the present invention includes spacing an upper die from a lower die for receipt of the first surface and the second surface configured in an overlying orientation, securing one end of the first surface to an end of the second surface and compressing the first surface toward the second surface to form a compressed arrangement which is inductively heated into a closure assembly.

Abstract: An electric arc welder for depositing weld metal along a groove between two edges of a metal workpiece where the welder comprises a first electrode driven by a first wire feeder toward a point in said groove, a second electrode driven by a second wire feeder toward the point and a main power source with a first output terminal connected to the first electrode and a second output terminal connected both to the second electrode and directly or indirectly to the metal workpiece to create a second electrode path and a workpiece path. The power source includes a high speed switching output stage for creating current with a selected AC waveform between the first and second output terminals where the waveform of the main power source is generated by a waveform generator controlling a pulse width modulator circuit to determine the current operation of the output stage.

Abstract: An apparatus forms a sheet into a beam having four exterior walls and a common center leg extending between an opposing two of the walls. The apparatus includes a roll former forming the sheet into the beam cross section, a welding station with top and bottom laser welders, and a weld box fixture having inwardly-biased external mandrels (biased by actuators) and outwardly-biased internal split mandrels (biased by springs) that interact to hold a desired shape of the beam in the weld fixture, and also includes a sweeping unit and cutoff device. By this arrangement, the internal and external mandrels, in combination with a bias of the actuators and springs, control a shape of the beam by flexure and movement of material of the sheet when in the weld box fixture during a welding process of the welder.

Abstract: An object of the invention is to provide a device and a method for controlling a welding angle which is capable of resolving restrictions occurred when a conventional float type welding angle control device is used to manufacture a welded pipe, and giving full play to the ability of such a float type welding angle control device, by adopting a new mechanism for supporting and adjusting a fin roll. When the welding angle is controlled by inserting the fin roll between opposing edges of a band steel at a position located in an upstream side of squeeze rolls, the fin roll is attached to a link mechanism in which two arms are coupled so as to be pivotable within a plane defined by a pipe manufacturing line direction and a perpendicular direction thereof, and positions of gripping points of the arms are changed to adjust a position of the fin roll within the plane.

Abstract: In order to evaluate the welding current for the resistance seam welding of an overlap seam of container bodies, a welding with changing welding current intensity is carried out for a container body of the production series, resulting in a changing welding of the seam, ranging from the welding with a too high temperature to the welding with a too low temperature. The electric energy for this welding is determined several times during this welding and/or the temperature of the weld seam is determined several times and the welding current intensity is determined at which the welding of the individual container body is too cold and the welding current intensity at which the welding is too hot. This determination is based on the determined electric energy values and/or on the determined temperature values and based on this determination a preferred range for the welding current intensity within these limits of too hot and too cold is determined.

Abstract: A vascular connector includes a main tube having a channel for fluid flow therethrough and opposed ends adapted to be connected to a vascular structure; and at least one inlet tube having a channel for fluid flow therethrough, a proximal end intersecting the main tube, and a distal end adapted to be connected to a vascular structure.

Abstract: A method for welding a tube member to a tubesheet includes positioning an open end of a tube member adjacent to a first side of the tubesheet and with the tube member extending through the tubesheet past a second side of the tubesheet. A penetration enhancing compound is applied to an inner side of the tube member at a location adjacent to a junction between an outer side of the tube member and the tubesheet second side. An arc welding operation is performed at the location of the penetration enhancing compound to effect formation of a weld joint at the junction between the tube member outer side and the tubesheet second side.

Abstract: Welders and methods are presented for short-circuit arc welding a workpiece using a modified series arc welding configuration with two electrodes via a sequence of welding cycles, in which each cycle includes an arc condition a short-circuit condition, wherein one or both electrode currents are selectively reversed during a reverse boost portion of the welding cycle to transfer molten metal from the second electrode to the first electrode prior to a short-circuit condition of a subsequent welding cycle.

Abstract: A process for the production of multi-layer metal composite tubes (10), wherein a metal strip is shaped to form a tube (16) and butt-welded along its two longitudinal edges. A plastic inner layer (12) is applied by extrusion in firmly adhering manner to the inside (12) of the metal tube (16) and a plastic outer layer (14) is applied by extrusion in firmly adhering manner to the outside (26) of the metal tube (16).

Abstract: The present invention relates to an electric arc automatic orbital welding machine (3) for carrying out butting welding between pipes of a bundle (2) and a cylindrical body (1) in heat exchangers, in which a cam mechanism (5) receives a circular motion around an axis (9) therefrom and generates an axial reciprocating motion along the same axis (9) and orthogonal to the plane of rotation so that the torch (7) describes the same spatial path which coincides with the intersection line between the pipe segment (2) and the cylindrical body (1).

Abstract: In one aspect the invention provides a friction welded component, and a method of manufacture for such a component, comprising a pair of upstanding tubular members (6,8) which are friction welded at their respective end cross-sections, in coaxial concentric relationship, to a surface of a thin walled member (4). A reinforcement means (10) is provided in the region between the tubular members such that loads acting on the tubular members are more evenly distributed to the thin walled member. The wall thickness of the thin walled member is substantially the same as or greater than the wall thickness of the tubular members The invention finds particular application in the fabrication of bosses to gas turbine aero-engine casings.

Abstract: A method and machine for deburring the burr which is formed when wires are butt welded is disclosed. The machine comprises a deburring head which has a pair of opposed deburring rollers mounted thereon. Each of the rollers has a milled surface formed therein. A linkage is connected to the rollers to cause the rollers to rotate when the linkage is moved between first and second positions. When the linkage is in its first position, the milled surfaces of the rollers face one another to enable the wires and burr to be positioned therebetween. As the linkage moves to its second position, the circumferences of the rollers engage the burr to roll out the same, thereby providing a substantially smooth, cylindrical surface where the burr was located. The method of deburring is also disclosed.

Abstract: A welding material assembly is constructed and arranged to position a welding material in electrically conductive relation between exterior surface portions of first and second weldable members at a location where the first and second weldable members are to be joined. The welding material assembly includes at least one welding material member mounted on a flexible carrier sheet in a predetermined arrangement, each welding material member being constructed of an electrically conductive metallic welding material capable of melting when heated by application of an electrical current and each carrier sheet being constructed of a material that is electrically nonconductive. Each welding material member is mounted on the sheet such that when the sheet is placed between the exterior surfaces of said first and second weldable members to be welded each said welding material member is electrically conductively disposed therebetween.

Abstract: A tube clamping assembly comprising a first portion having a base and a clamping device carried on the base, and a second portion having a base and a clamping device carried on the base. The first and second portions are coupled to each other such that the portions may be adjusted relative each other. In another embodiment, the invention is a tube clamping assembly comprising a base, and a first movable clamp arm and a first stationary clamp arm coupled to the base for gripping a cylindrical workpiece therebetween. The tube clamping assembly further comprises a second movable clamp arm and a second stationary clamp arm coupled to the base for gripping a cylindrical workpiece therebetween, wherein at least one of the stationary clamp arms is removably coupled to the base.