A welding torch (1) includes a cylindrical nozzle (2) in which shielding gas is flown from an opening (3b), and an electrode (4) that is a bar-shaped body projecting from the opening (3b). The shielding gas includes upper shielding gas flowing in an upper region (3u) on an upper side of a central axis (C2) of the electrode (4), and lower shielding gas flowing in a lower region (3d) on a lower side of the central axis (C2) of the electrode (4). Atmospheric pressure of the lower shielding gas is higher than atmospheric pressure of the upper shielding gas. A method of horizontal welding with this kind of welding torch is also defined.

A device for welding together cylindrical sections of a casing. The device comprises a clamping ring configured to surround and attach to a section of the casing and a robot provided with a welding gun and at least one joint, wherein the robot is movably attached to the clamping ring by cooperating means. A method for welding cylindrical sections of a casing by using such a device includes the steps of a) positioning and clamping the clamping ring at the correct position, b) moving the robot along the clamping ring to the correct position for welding, c) welding the sections to each other by the welding gun of the robot, and d) releasing the clamping ring.

A device for fabrication of a weldment includes a carrier that has a first end plate, a second end plate and a frame extending between and connected to the first end plate and the second end plate. The first end plate has a first opening formed therein and the second end plate has a second opening formed therein. The first opening and the second opening are configured to removably secure weldable parts therein. The device includes a track system fixedly mounted to a foundation and a carriage moveably mounted to the track system. The track system and carriage collectively include a plurality of rollers arranged in an arcuate path. The carrier is removably mounted on the carriage, and the carriage and/or the track system is configured to move along the arcuate path defined by the plurality of rollers.

Provided is a ceramic shelf assembly for aiding formation of a butt weld of adjacent metal plates in a groove formed between adjoining plates. The assembly has at least one ceramic block having at least one straight edge. The assembly further provides an apparatus for removably attaching the rear side of the ceramic block to a front surface of one of the adjacent metal plates along an edge of the groove.

A TIG welding device (10) includes a welding robot (11), robot control device (12), welding torch (13), welding control device (14), gas feeder (15), and a height detection device (16). The welding torch (13) is set at a reference position, and the height detection device (16) detects the respective heights of two tip parts (4e). The robot control device (12) drives the welding robot (11) such that a torch electrode (13c) of the welding torch (13) abuts on central part of the higher tip part (4e). When the torch electrode (13c) is moved toward the reference position while power is supplied to the torch electrode (13c), and inert gas flows in the periphery of the torch electrode (13c), arc (AC) is generated in a gap between the tip parts (4e) and the torch electrode (13c). The overall two tip parts (4e) are melted and welded by this arc (AC).

Hybrid manual and automated welding systems and methods are described. A hand-held welding tool is manually positioned to engage a workpiece. A weld is started from an initial position based on a first manual operator event. A welding heat source is automatically or autonomously moved along the weld relative to the workpiece from the first position to a second position relative to the workpiece during welding.

A TIG welding device (10) includes a welding robot (11), robot control device (12), welding torch (13), welding control device (14), gas feeder (15), and a height detection device (16). The welding torch (13) is set at a reference position, and the height detection device (16) detects the respective heights of two tip parts (4e). The robot control device (12) drives the welding robot (11) such that a torch electrode (13c) of the welding torch (13) abuts on central part of the higher tip part (4e). When the torch electrode (13c) is moved toward the reference position while power is supplied to the torch electrode (13c), and inert gas flows in the periphery of the torch electrode (13c), arc (AC) is generated in a gap between the tip parts (4e) and the torch electrode (13c). The overall two tip parts (4e) are melted and welded by this arc (AC).

A method comprises: providing a weldment and a welded plate to which the weldment is to be welded, an end of the weldment to be welded to the welded plate being provided with a first welding face and a second welding face, the first welding face and the second welding face forming a pointed cone, the first welding face corresponding to a first welding area, and the second welding face corresponding to a second welding area; in the first welding area, welding being performed at the innermost side of the pointed cone to form a first welding pass; in the second welding area, welding being performed at the innermost side of the pointed cone to form a second welding pass, and then welding being performed at the outer side of the second welding pass to form a third welding pass adjacent to the second welding pass.

An assembly table for use in a remote manufacturing yard is provided. The assembly table is configured to be collapsible thereby allowing for a reduced footprint during transportation. The assembly table can include a central support base; a plurality of arms attached to the central support base; a secondary support member attached to each arm configured to provide support for and give height to the assembly table when in use; and a centering guide attached to each arm, the centering guide configured to receive a bottom portion of a partial shell, the centering guide located at a predetermined location of its own arm.

A method comprises: providing a weldment and a welded plate to which the weldment is to be welded, an end of the weldment to be welded to the welded plate being provided with a first welding face and a second welding face, the first welding face and the second welding face forming a pointed cone, the first welding face corresponding to a first welding area, and the second welding face corresponding to a second welding area; in the first welding area, welding being performed at the innermost side of the pointed cone to form a first welding pass; in the second welding area, welding being performed at the innermost side of the pointed cone to form a second welding pass, and then welding being performed at the outer side of the second welding pass to form a third welding pass adjacent to the second welding pass.