An orbital welding device (1) having a welding head (2), the welding head having a tubular mount (3) and a welding electrode holder (4) rotatably supported with respect to the tubular mount (3), the orbital welding device (1) having an electric motor (6) activated by a motor controller (5) of the orbital welding device (1), which is configured to drive the welding electrode holder (4) and thus to rotate the same with respect to the tubular mount (3), wherein the orbital welding device (1) has an electric torque measuring device (7), which is configured to measure a torque applied by the motor (6) to the welding electrode holder (4), wherein the torque measuring device (7) is connected to the motor controller (5), and wherein the motor controller (5) is configured to stop the motor (6) automatically if the torque exceeds a predetermined first torque.

A method for repairing a defective circumferential weld joint between two pipe sections in a pipeline is described. A weld excavation machine is used to remove a weld defect. The machine comprises a weld excavating tool and a tool guiding apparatus. The machine may be modular in form allowing the machine to be dissembled into discrete portable parts. The method includes arranging the tool guiding apparatus in fixed relation to the pipeline, guiding the weld excavating tool around the pipe and along the weld joint by means of the tool guiding apparatus and using the weld excavating tool to remove material from the defective weld region. An excavation may thus be formed having parallel vertical walls. The excavation is then filled with weld material by means of a welding apparatus.

A cylinder welding system includes a welder that has a control unit, a welding head and a wire feed. Each of the wire feed and the welding head is electrically coupled to the control unit. A cart is provided and the cart is rollably positioned within a cylinder. A rotation unit is rotatably coupled to the cart and the rotation unit engages an inside surface of the cylinder. The rotation unit is electrically coupled to the control unit such that the control unit controls operational parameters of the rotation unit. In this way the rotation unit is actuated to rotate along the inside surface of the cylinder. The welding head is coupled to the rotation unit to weld the inside of the cylinder when the rotation unit rotates along the inside of the cylinder. In this way one cylinder may be automatically welded to another cylinder.

In one aspect, embodiments of the present disclosure are directed to a process for manufacturing a side pocket mandrel that involves welding upper and lower swages to a central body of the side pocket mandrel. In some embodiments, the process includes the steps of providing a first side of the welded joint and a second side of the welded joint, where the first and second sides are either the central body or the swage. The process continues with the step of approximating the first and second sides such that the first and second sides are in contact. Importantly, the first and second sides are brought together without creating a root gap between the first and second sides. Next, the first and second sides are welded together to form the welded joint between the swage and the central body.

A support ring supports a welding ring to guide welding bugs around a coated pipe section. The support ring has a tubular body to support the welding ring, the body having substantially circular curvature around a longitudinal axis. At least one grounding extension connected to the body is offset longitudinally and radially outwardly with respect to the body and the longitudinal axis. This allows the grounding extension to lie radially outboard of a parent coating of the pipe section while the body encircles a cut-back end zone where the parent coating has been cut back. Pipe sections abutting end-to-end for welding can each be fitted with these support rings. This enables welding rings to encircle both of the cut-back end zones and allows effective grounding connections to be made without enlarging the cut-back end zones.

A welding device which performs butt welding of tubes includes a table. The table supports a rotary member of a circular-arc shape to which a welding torch is mounted, and a gear train that rotates the rotary member around a center axis of the tubes. The welding device includes a first movement mechanism that moves the table in a first direction perpendicular to the center axis of the tubes, and a second movement mechanism that moves the first movement mechanism in a second direction perpendicular to the center axis of the tubes and the first direction.

The present disclosure describes a system including a support structure configured to provide support for various orbital welding components. The system also includes an orbital weld head body attached to the support structure. The orbital weld head body is made of a thermally conductive material and includes at least one cooling bar that spans at least a portion of the length of the orbital weld head body. The cooling bar includes various internal cooling channels to route coolant through the cooling bar of the orbital weld head body. The orbital weld head body also includes at least one pressurized fluid input line that attaches to the internal cooling channels of the cooling bar and conducts a fluid coolant to the internal cooling channels of the cooling bar. Other apparatuses and orbital welding machines are also described.

A method for joining two metallic, tubular joining members to one another, the method including arranging two metallic, tubular joining members with respect to one another in an overlapping or end-face manner, and joining the joining members by material bond along a joining zone of the joining members. In the joining, a chain of joining spots extending in the circumferential direction of the joining members is produced in the joining zone, wherein successive joining spots in the chain overlap, wherein, in the joining, the joining spots are produced by means of TIG pulse welding with an arc time of up to 100 ms, preferably of up to 50 ms, wherein an arc of a welding pulse of the TIG pulse welding is extinguished after the arc time has been reached. A corresponding welding apparatus is also described.

The invention relates to a method for connecting the ends of steel tubes by means of orbital welding using a hybrid laser arc technique, with the tubes preferably having wall thicknesses 6 mm and more particularly 12 mm and diameters of preferably 150 mm, the ends of which tubes are connected by one or more welding passes, wherein the laser and arc welding heads as tools are guided over a guide ring fixedly arranged around a tube end in the region of the weld site during the welding and are displaced around the tube diameter. The invention also relates to a device for carrying out the method, wherein the laser and the arc welding heads are positioned separately on the guide ring and are moved over the tube circumference and controlled independently of one another during the welding process.

A device for connecting the ends of pipes, which are aligned, tack-welded and made of steel, by an orbital welding process using a welding joint formed by the pipe ends and using tools which can be orbitally moved about the welding joint for welding and checking the seam. The device includes guide base plates placed on both sides at each pipe end in the region of the welding joint and rigidly clamped to the pipe ends. The guide base plates centrally have a circular recess with a radial opening for the feed-through of the pipes to be welded. The guide base plates include clamping elements rigidly connected to each guide base plate face facing away from the welding joint, and a frame for receiving the welding and checking tools, the frame rotatably mounted between the guide base plates and centrally pivotal about the pipe ends by at least 360.