A method for processing a workpiece using a pulsed laser beam includes beam shaping of the laser beam to form an elongated focus zone in the material of the workpiece. The beam shaping is carried out by using an arrangement of diffractive, reflective and/or refractive optical assemblies. The beam shaping includes focus-forming beam shaping to cause beam portions to enter at an entry angle to a beam axis of the laser beam for forming the elongated focus zone along the beam axis in the workpiece by way of interference, and phase-correcting beam shaping to counteract any influence of the interference by entrance of the laser beam into the workpiece. The method further includes setting beam parameters of the laser beam so that the material of the workpiece is modified in the elongated focus zone.

A jig device for laser welding of the disclosure inclides a jig body having a semi-oval shaped seating groove in which a lower side of a refrigerant pipe to which a charging port is coupled is seated: a first pressing block provided in an upper portion of one side of the jig body and having a first groove part configured to press an upper portion of one side of the refrigerant pipe and an upper portion of one side of a fixing part of the charging port at a lower surface thereof; and a second pressing block provided at an upper portion of the other side of the jig body and having a second groove part configured to press an upper portion of the other side of the refrigerant pipe and an upper portion of the other side of the fixing part of the charging port at a lower surface thereof.

The presently disclosed technology includes a friction stir welding apparatus comprising a frame, a moving platform and a parallel mechanism composed of three branch mechanisms, wherein a first branch mechanism comprises a first sliding pair, a first revolute pair, a telescopic rod and a first spherical pair connected in sequence. A second branch mechanism and a third branch mechanism both comprise a third sliding pair, a second revolute pair, a third linkage and a second spherical pair connected in sequence. The friction stir welding apparatus has high stiffness, low inertia, high dynamic performance and high accuracy, which can achieve precision welding with high requirements on processing quality and accuracy for jointing annular seams of large-scale rocket fuel storage tank barrels in the aviation field, for example. The presently disclosed technology also includes a corresponding friction stir welding system.

Within examples, a method of manufacturing a double-walled titanium conduit is described. Example methods include stitch welding multiple concentric sheets to form a stitch layer, providing the stitch layer between an inner wall and an outer wall of the double-walled titanium conduit, circumferentially seam welding the inner wall and the outer wall to the stitch layer to create a welded assembly, die forming the welded assembly at temperature and pressure to form inner structures between the multiple concentric sheets according to stitch welding lines and to enable a diffusion bond process among the inner wall, the stitch layer, and the outer wall, and removing the double-walled titanium conduit from the die.

A method for producing a tube from metal is stated, by use of which method a metal strip by means of a drawing-off installation is moved in the longitudinal direction of said metal strip and is guided through a forming station in which said metal strip is formed to a slot tube having a slot running the in the longitudinal direction. The two edges of the metal strip abut to one another at the slot. Said two ends for producing a fully closed tube are welded to one another by use of a welding installation that is equipped with a laser. The slot tube after leaving the forming station is initially moved into the region of the laser and is then stopped. Thereafter, the regions of the edges of the slot tube that are to be welded to one another are pre-treated by the laser. Thereafter, the power of the laser is set to the welding power thereof that corresponds to the welding temperature, and by switching on the drawing-off installation the slot tube is simultaneously moved in the longitudinal direction of the latter.

Devices, systems, and methods are directed to automated techniques for fitting flanges to tubular sections used to form tubular structures, such as large-scale structures used in industrial applications (e.g., wind towers and pipelines). As compared to manual techniques for fitting flanges to tubular sections, the devices, systems, and methods of the present disclosure facilitate faster attachment of flanges, which may be useful for achieving cost-effective throughput. By way of further comparison to manual techniques, the devices, systems, and methods of the present disclosure may, further or instead, facilitate achieving tighter dimensional tolerances. In turn, such tighter dimensional tolerances may be useful for forming thinner-walled, lighter, and lower cost tubular structures. Still further or in the alternative, automated techniques for fitting flanges to tubular sections may facilitate attachment of multipiece flanges or other non-traditional flange geometries.

One of a first metallic pipe containing a first metal as a main component and a second metallic pipe containing a second metal as a main component includes an expanded-diameter connecting part which is formed at an end part of the one metallic pipe. An inner diameter of the end part is greater than an inner diameter of an adjacent part that is adjacent to the end part. An intermetallic compound layer of the first and second metal is present at an interface of the first and second metal located between a brazing filler metal and the one or the other of the metallic pipes. A thickness of the intermetallic compound layer is configured such that the thickness of an end portion on the side of a base end is smaller than the thickness of an end portion on the side of an open end.

An apparatus for introducing a parting agent into a hollow workpiece before or during processing of the hollow workpiece by using a laser processing machine, includes an introduction section with a nozzle for dispensing the parting agent and a centering element which is disposed on the introduction section and serves for centering the introduction section within the hollow workpiece. A loading station, a system and a method are also provided.

A coil to magnetic-pulse weld tubular parts including an active portion having an active surface which is arrangeable to face an area of overlap between the tubular parts. The active surface defines a tubular opening oriented in an axial direction. The active surface has a predetermined axial length. The tubular opening has, in the axial direction, along the axial length of the peripheral surface, two sections having a constant cross-section. The two sections are connected therebetween by a section having a continuously increasing cross-section. A related magnetic-pulse welding method is also provided herewith.

A steel strip for an electric-resistance-welded steel pipe or tube having a strength of X70 grade or more and excellent HIC resistance and SSC resistance is provided. A steel strip for an electric-resistance-welded steel pipe or tube has a chemical composition containing, in mass %: C: 0.02% to 0.06%; Si: 0.1% to 0.3%; Mn: 0.8% to 1.3%; P: 0.01% or less; S: 0.001% or less; V: 0.04% to 0.07%; Nb: 0.04% to 0.07%; Ti: 0.01% to 0.04%; Cu: 0.1% to 0.3%; Ni: 0.1% to 0.3%; Ca: 0.001% to 0.005%; Al: 0.01% to 0.07%; and N: 0.007% or less, with a balance being Fe and incidental impurities, contents of C, Nb, V, and Ti satisfying the following Expression (1)

[C]−12([Nb]/92.9+[V]/50.9+[Ti]/47.9)≦0.03%  (1),

wherein a ferrite area ratio is 90% or more.