A rapid sequential circular assembly system for a space station includes a plurality of station-constructing modules arranged in a circular manner that are connected to each other in radial profile so that a torus-shaped space station and/or cylindrical shaped space station can be built with a plurality of panels. Each station-constructing module includes a panel dispensing unit, a panel transporting cart, a first welding assembly, and a second welding assembly. The panel transporting cart is operatively coupled to a pair of rails of the panel dispensing unit, wherein the panel transporting cart travels between a storage compartment of the panel dispensing unit and the second welding assembly. The first welding assembly is connected along the pair of rails, and the second welding assembly is terminally connected across the pair of rails to seam weld each of the panels that are transported from the panel transporting cart.

A system and method provide gasless, mechanized, field welding of an exterior of a tubular structure such as a pipeline, without the need for an enclosure. An embodiment consolidates some of the welding equipment on a skid for ease of transport to and from a remote worksite. The gasless weld may be achieved despite the presence of wind, by precisely controlling an arc voltage as disclosed. The footprint and weight of the system may be minimized, along with the associated labor, expense, and environmental impact otherwise incurred by conventional welding techniques using enclosures.

A mobile hardbanding system that uses PTA welding to perform hardbanding on drill string sections at the well site. The inventive system allows alternate use of PTA and MIG welding. Both a PTA torch and a MIG torch are provided. Changing from one type of welding to the other is simplified by including separate electrical, gas, and cooling conduits for each torch. The torch not in use is parked in the welding compartment near the weld box. The powder hopper for the PTA welding assembly may be mounted on a swivel arm so that it can be moved out of the way when the MIG torch is in use.

An automated welding system includes a welding robot and control circuitry. The welding bug robot includes a welding torch. The welding bug robot is configured to move on a track disposed around a circumference of a first pipe and perform a root pass welding operation at a joint between the first pipe and a second pipe. The control circuitry is configured to control movement of the welding bug robot around the circumference of the first pipe, apply a high energy welding phase via the welding torch to establish a first root condition, and apply a low energy welding phase via the welding torch to establish a second root condition.

The invention describes methods of welding onto laminated devices using a low temperature welding process. Also described are laminated devices with welds that do not disrupt a brazed core block of sheets in the laminated devices. Novel laminated devices with welded features for servicing the devices are also described.

Provided are a welding apparatus and a method, including a welding torch, a wire nozzle, a support stand that supports the welding torch and the wire nozzle with a predetermined distance therebetween, and a first support mechanism that supports the support stand so that the support stand is rotatable around a first support axis that is along a direction in which the welding torch and the wire nozzle are arranged.

Provided are a weld seam structure and a welding process suitable for a narrow-gap water-cooled wall tube panel. The weld seam structure comprises a groove-type gap formed between adjacent water-cooled wall tubes, where welding joints are arranged on sides of the adjacent water-cooled wall tubes that are close to each other, and the welding joints are distributed on an upper side of the groove-type gap, and the welding joints communicate with the groove-type gap. In addition to the original welding joints, the adjacent water-cooled wall tubes are considered as a whole; and the gap between the water-cooled wall tubes is processed into a groove type and welded together with the welding joints, which increases the thickness of the weld seam at the tangent point and the safety factor, also facilitates performing radiographic non-destructive testing.