Abstract:
The invention relates to an apparatus and method for coating a pipe (20) or a section of a pipe with a polymer layer (26). The apparatus comprises an applicator (22) for applying polymer melt on the surface of a pipe or pipe section, a roller (24) for pressing the polymer applied by the applicator towards the pipe or pipe section, the roller having a central axis, and means for circumferentially moving the applicator and the roller around the periphery of the pipe or pipe section. According to the invention the apparatus further comprises a drive for rotating the roller actively around its own central axis as the roller is moving around the periphery of a pipe or pipe section. By means of the invention, higher quality coatings can be applied to field joints of steel pipes, for example.
Abstract:
The invention relates to a device for centring and clamping conduits which are preferably made from alloy steel and which are positioned end to end in order to be welded to form a pipeline. The invention comprises: means for centring and clamping two conduits that are to be welded, optional leak-tight partition means which define an inerting chamber at the mating surface, and inert gas distribution means for creating a protective atmosphere at the mating surface. The inventive device also comprises at least means for the real-time measurement of the moisture content of the protective atmosphere and means (3) for the real-time regulation of the moisture content as a function of said measurements, such that the moisture content of the atmosphere is maintained below a pre-determined threshold value.
Abstract:
This invention relates to a friction welding apparatus (10), and more particularly, but not exclusively, to a modular friction welding apparatus suitable for in-situ reparation of blind holes in pipes (12). The friction welding apparatus (10) includes a frame assembly (20), a spindle assembly (40) for holding a friction welding consumable; and a drive assembly (30) for driving a spindle of the spindle assembly. The spindle assembly (40) and the drive assembly (30) are releasably securable to the frame assembly (20) so as to form a modular friction welding apparatus, and the frame assembly (20) is furthermore removably securable to an object to be welded.
Abstract:
Provided are metal structures and methods of forming such structures for use in oil, gas and/or petrochemical applications that are joined with non- ferrous or high alloy weld metal compositions or a high alloy weld metal compositions. The welded metal structures include two or more segments of ferrous or non-ferrous components, and fusion welds, friction stir welds or a combination. The resultant welded structures exhibit improvements in fatigue resistance, toughness, strain capacity, strength, stress corrosion cracking resistance, and hydrogen embrittlement resistance compared to traditional iron- based weld compositions. The structures and methods of forming such structures are advantageous in joining metal components in applications for natural gas transportation and storage, oil and gas well completion and production, and oil and gas refinery and chemical plants. Weld metals may include Inconel 625, Ti64, stainless steels, marging steels, precipitaion hardening steels.
Abstract:
A clamp for a cylindrical workpiece useful for a tube welder includes two clamping plates arranged to move in the same plane to engage the workpiece in a central opening formed by cooperating indentations in the clamping plates and both clamping plates are provided with at least one supported beam flexible member for pressing against the workpiece and accommodating variations in the diameter of the workpiece from the nominal diameter.
Abstract:
The invention relates to a device for centring and clamping conduits which are preferably made from alloy steel and which are positioned end to end in order to be welded to form a pipeline. The invention comprises: means for centring and clamping two conduits that are to be welded, optional leak-tight partition means which define an inerting chamber at the mating surface, and inert gas distribution means for creating a protective atmosphere at the mating surface. The inventive device also comprises at least means for the real-time measurement of the moisture content of the protective atmosphere and means (3) for the real-time regulation of the moisture content as a function of said measurements, such that the moisture content of the atmosphere is maintained below a pre-determined threshold value.
Abstract:
A residual stress improving apparatus for piping, which can heat an outer peripheral surface of piping to reduce (including eliminate) the residual stress of the piping, whose apparatus configuration is relatively compact, and which can also heat the outer peripheral surface of a bending pipe portion, is provided. For this purpose, the apparatus has a laser head portion 6, and circumferential direction moving means composed of a ring rail 3 and a rotational travel bogie 5. Further, the apparatus may include reflection direction adjusting means for adjusting the reflection direction of laser light so that the laser light reflected by the outer peripheral surface of the piping does not return to the laser head, delivery direction adjusting means for adjusting the delivery direction of the laser light so that the outer peripheral surface of the bending pipe portion located forwardly, in the pipe axis direction, of the laser head is irradiated with the laser light, pipe axis direction moving means for moving the laser headportion in the pipe axis direction, output adjusting means for adjusting the output of the laser light so that the irradiation intensity on the outer peripheral surface of the bending pipe portion becomes uniform, and pivoting means capable of bringing the forward side, in the pipe axis direction, of the laser head portion close to and away from the outer peripheral surface of the bending pipe portion.
Abstract:
L'invention concerne un procédé de soudage par faisceau laser avec apport de fil de soudage fusible et gaz de protection, dans lequel ledit fil est fondu par ledit faisceau laser de manière à réaliser un joint de soudure sur au moins une pièce en acier à souder, de préférence la ou les pièces sont en acier ferritique, caractérisé en ce que ledit joint de soudure contient de 30 à 1000 ppm en poids de titane, au moins 0.7% en poids de manganèse, de 50 à 1000 ppm en poids d'oxygène, de 5 à 2500 ppm d'aluminium, moins de 10% de nickel et dont le rapport Al/O est inférieur à 2,5. L'invention porte aussi sur un fil fourré de soudage utilisable avec ce procédé.