A method is disclosed. The method includes disposing an automated welding device adjacent to a pipe joint and welding an open root pass via the automated welding device using the predefined welding process, wherein the predefined welding process is configured to control a welding arc in response to a short circuit condition. A secondary welding process can be overlaid on the predefined welding process by cycling welding parameter of the predefined welding process can be cycled between a high parameter value and a low parameter value about a base parameter value. Further, an arc between the automated welding device and the pipe joint can be maintained during welding. Because the welding parameter is cycled between a high and low parameter value, the automated welding device can deliver consistent successful welds.

A device for welding pipe branches and extensions to a main pipe from inside the main pipe. The device includes a frame (30) and a frame cylinder (31), an elongated electrode shaft (3) having a longitudinal central axis, around which the electrode shaft is rotatably arranged, a rotator disc (13) of the electrode shaft (3), through which the electrode shaft is able to slide axially, an electrode holder (4) in the end of the electrode shaft, an electrode (5) fastened to the holder (4), a welding jig (1, 1.2, 1.3; 2.3, 2.4, 2.5) for supporting the main pipe (6.1; 2.2a) in the welding station, a fastening element (8, 8a) of the welding jig, a rotating element (9) of the welding jig, to which the fastening element is fastened and which is rotatably bearing-mounted inside the frame cylinder (31) such that the rotational axis of the welding jig combines with the central axis of the electrode shaft. The welding jig has a support bracket (1.2, 1.3; 2.4, 2.5) for the main pipe (6.1; 2.2a), by which the main pipe is to be supported in the station, in which the centre axes of the main pipe (6.1; 2.2a) and the electrode shaft (3) are combined. The welding jig has, surrounding the electrode shaft (3), an adapter piece (23), to which is connected a shielding gas channel (24), the shielding gas being adapted to be guided through the adapter piece (23), into the main pipe, and through it, also into the pipe branch or extension to be welded, when the main pipe, or the pipe extension (6.3) to be welded to the main pipe, or the shielding gas pipe (2.3) surrounding the main pipe rests against the adapter piece (23). The rotator disc (13) of the electrode shaft is equipped with a locking device (12), with which the electrode shaft (3) is to be immovably locked in relation to the rotator disc (13).

A pre-assembled insulated weld backing ring for a tubular section of the pipeline. The weld backing ring includes a metal cylinder and an insulation layer. The metal cylinder has a ring-shaped anterior portion and a ring-shaped raised posterior portion with a step therebetween. The posterior portion has a larger diameter than the anterior portion to define an insulation pocket. The insulation layer is positioned on the external surface of the metal cylinder. The insulation layer is made of an insulated material positioned in the insulation pocket to define a protective barrier to protect the tubular section during welding. The weld backing ring may also include a second metal cylinder positioned on the insulation layer. The weld backing ring may be pre-assembled by applying a tubular metal section material to a sheet of metal and rolling the sheet of metal to form the metal cylinder.

A process of welding fittings to ends of a double wall pipe comprising forming a first welded joint between an inner pipe and an inner receiver of a first fitting; forming a second welded joint between an outer pipe and an outer receiver of the first fitting; forming a third welded joint between the outer pipe and an outer receiver of a second fitting; and forming a fourth welded joint between the inner pipe and an inner receiver of the second fitting.

A welding device for automatically welding a workpiece by a welding robot using a welding wire includes a welding control device that controls operation and welding work of the welding robot. The welding control device includes a sensing unit configured to detect a position of the workpiece, a root gap calculating unit configured to determine a root gap, and a storage unit including wire melting information as a database of a proper welding current corresponding to a feeding rate for each of the welding wire. A lamination pattern and a welding condition are provided in accordance with the root gap determined by the root gap calculating unit and the wire melting information so that an amount of heat input is equal to or less than a predetermined amount of heat input.

A machine which transports and positions joints of line pipe has a trailer member having at least two ground engaging wheels and a distributor box disposed within the trailer member. The distributor box has a top, a bottom, a front and a back, where a longitudinal axis is defined between the front and the back. A shaft is rotationally supported between the front and the back, where the shaft has an axis coinciding with the longitudinal axis. A plurality of spaced-apart disks are mounted on the rotatable shaft, where each disk has a plurality of slots radially extending to a circumferential edge of the disk, where each slot is open-ended at the circumferential edge and each disk of the plurality of spaced-apart disks has a slot in axial alignment with a slot of the other spaced-apart disks. The group of the axially aligned slots is adapted to receive a joint of the line pipe. A conveyor is at the bottom of the distributor box, so configured that as the rotatable shaft turns, the conveyor is adapted to receive the joint of line pipe dropping from the group of the axially aligned slots and feed the joint of line pipe out of an opening at the back of the trailer member.

A method for automated circumferential welding of a workpiece by means of at least one welding device, including: (a) determining a further weld path for a further weld to be welded on the workpiece, the further weld extending from a start point, via a downstream part to a stop point, (b) determining first welding parameters associated with the further weld and adapted to weld the further weld on the workpiece, the first welding parameters are adapted to transfer a first level of heat to the workpiece, (c) identifying at least one overlap area in the further weld path between the downstream part and the start point of the further weld or between the further weld and a start or stop point of a previous weld, (d) determining a boost area, the boost area including the at least one overlap area, (e) determining boost welding parameters associated with the boost area and adapted to weld the further weld in the boost area, the boost welding parameters are adapted to transfer a second level of heat to the workpiece, the second level of heat exceeding the first level of heat, and (f) welding the further weld from the start point to the stop point thereof, the first welding parameters are selected for welding of the further weld outside the boost area, and the boost welding parameters are selected for welding the further weld inside the boost area.

The method can include inserting a first portion of a backing device into a fluid aperture of a first conduit component, inserting a second portion of the backing device into a fluid aperture of a second conduit component, and bringing the second conduit component adjacent the first component over the backing device, fusion welding the first conduit component to the second conduit over the backing device, and removing the backing device by circulating a fluid inside the welded conduit components. The backing device can be made of a soluble material.

The method can include inserting a first portion of a backing device into a fluid aperture of a first conduit component, inserting a second portion of the backing device into a fluid aperture of a second conduit component, and bringing the second conduit component adjacent the first component over the backing device, fusion welding the first conduit component to the second conduit over the backing device, and removing the backing device by circulating a fluid inside the welded conduit components. The backing device can be made of a soluble material.

The invention described herein generally pertains to a system and method related to controlling a welding system having a tractor welder engaged with a track by utilizing a pendant component that is configured to receive an input from a user and displaying data via a graphical display. The pendant component includes one or more inputs that correspond to data displayed, wherein the one or more inputs include a first toggle switch and a second toggle switch, an encoder knob, a first set of buttons and a second set of buttons.