Abstract: A high temperature iron-chromium-aluminium (FeCrAl) alloy tube extending along a longitudinal axis, wherein the tube is formed from a continuous strip of a high temperature FeCrAl alloy and comprises a helical welded seam. The high temperature FeCrAl alloy tube is manufactured by feeding a continuous strip of the high temperature FeCrAl alloy toward a tube shaping station, helically winding the strip such that long edges of the strip abut each other and a rotating tube moving forward in a direction parallel to its longitudinal axis is formed, and continuously joining said abutting long edges together in a welding process directly when the tube is formed, whereby a welded tube comprising a helical welded seam is obtained.

Abstract: The present invention relates to an upper subsea wellhead surface joint, a lower subsea wellhead surface joint, an upper subsea wellhead conductor joint, and a lower subsea wellhead conductor joint. According to the present invention, these are machined from a single piece of forged steel material and corrosion protected by means of an electrolytic or other process.

Abstract: A method of manufacturing a tube is provided. The method includes: selecting a core pipe having a thickness that is initially less than a desired thickness of the tube; and building-up an outer layer over an exterior surface of the core pipe via additive manufacturing so as to increase the thickness of the core pipe such that the thickness of the core pipe is equal to the desired thickness of the tube.

Abstract: The metal forming method includes deforming a member to be formed (2) that includes a second metal and that has been heated and bringing the member into contact with a member to be bonded (3) that includes a first metal and that has been heated, in which the temperature of the member to be bonded (3) is a temperature at which a liquid phase percentage in the member to be bonded (3) is from 5 to 35%.

Abstract: Connecting ends on a hose piece comprising several metal layers, in particular a strip wound metal hose piece, are produced by fixing the overlapping metal layers of a hose of larger length or of an endless hose in the region of the point of separation through welding and subsequently cutting off the hose piece from the longer hose or the endless hose. For simple and inexpensive fixing of the metal layers in the region of the point of separation, a welding seam is generated which extends through at least part of the periphery of the hose or about its entire periphery, using roller seam welding. The hose piece can subsequently be separated along the welding seam obtained in this manner, e.g. along its central line, thereby ensuring permanent and reliable fixing of the metal layers in the region of the connecting end.

Abstract: The present invention is a method and apparatus for making a double-ply metal tube such as those used for automobile brake tubes by producing the tube continuously in a single process. The present invention is characterized by using a high-temperature reducing molten salt with high heat capacity as the heating medium, whereby the welding speed can be increased and the balance with the tube-making speed can be kept.

Abstract: An apparatus and method of manufacturing a wellscreen for subterranean use in oil, gas, and water wells, incorporating numerous automated processes, whereby layers of mesh are continuously sintered to a perforated strip, formed into a tube, placed over a perforated base pipe, and sealed with end rings.

Abstract: The present invention is a method and apparatus for making a double-ply metal tube such as those used for automobile brake tubes by producing the tube continuously in a single process. The present invention is characterized by using a high-temperature reducing molten salt with high heat capacity as the heating medium, whereby the welding speed can be increased and the balance with the tube-making speed can be kept.

Abstract: Conductors are placed in insulator which acts as a spacer/centralizer for the conductors, which are in turn mounted within tubing. The void spaces between the insulator and the tubing inside wall can be filled with a sealing material. Alternatively, the voids around the substantially centralized conductors can be used as flow channels for the transmission of fluid pressure to a remote location, such as downhole. The conductors are protected because they are kept away from the tubing wall and can be further protected by the addition of the sealing material.

Abstract: A polymeric-based material for use in brazing operations to prevent agglomeration and run-off of brazing material on exterior exposed surfaces of the workpiece containing an extrudable melt-processible thermoplastic material selected from the group consisting of polyethylene, polypropylene, ethylene vinyl alcohol, nylon, and mixtures thereof; and up to about 20% by weight, based on the thermoplastic material, of an inert inorganic particulate material such as carbon or carbon black capable of at deposition on and adherence to an underlying metallic surface. In the process of the present invention, the polymeric-based material is imparted by any suitable means to the exterior or exposed surface of the workpiece to be brazed prior to exposure of the workpiece to a suitable fluxing atmosphere and temperature. In tube forming processes, the polymeric-based material is applied to the outer circumferential area of the formed unsealed tubing.

Abstract: A non-corrosive double-wall tubing in which an unbrazed, unsealed continuous double-wall tube of a given circumference is formed from a metal sheet composed of a first non-ferritic metal having a first defined region of exposed non-ferritic metal and a second region of a second metal in overlying relationship thereto, said exposed region having a width essentially equal to the circumference of the finished tube.

Abstract: A seamless double-walled tube having high corrosion resistance and relative flexibility prepared by a process for brazing non-ferritic steel surfaces such as nickel chromium or stainless steel to which a suitable brazing alloy such as copper has been mechanically attache which includes the steps of instantaneously elevating the surface of the stainless steel to a brazing temperature while maintaining the material in a humidified gaseous atmosphere consisting essentially of a non-reactive carrier gas and a reactive gas present in sufficient concentrations to achieve fluxing; maintaining the surface temperature of the steel for an interval sufficient to permit fusion between the selected metal and the non-ferritic steel surface; after metal fusion has been achieved, allowing the resulting fused metal material to cool to a first lowered temperature in a controlled non-oxidative atmosphere at a rate which retards the formation of fine-grained steel crystals in the metal; and after reaching a metallurgical transfo

Abstract: A multi-walled steel pipe comprises a metal strip plated with copper and including a brazing layer thereon. At least one surface of the metal strip is roughened and braze welded to the other, overlapping surface when the metal strip is rolled. The roughened surface has a roughness in the range of between 10 and 30.mu.m. A method of making a multi-walled steel pipe comprises roughening at least one surface of a metal strip, the metal strip being previously plated with copper and including a brazing layer thereon, rolling the metal strip a plurality of times by a pipe forming machine to provide a pipe body with the roughened surface directed toward the other overlapping surface, while the metal strip being fed between a plurality of sets of rollers in the pipe forming machine, and heating the pipe body to a melting temperature of the brazing layer in a furnace so as to braze weld the overlapping surfaces of the metal strip together.

Abstract: A process for producing non-corrosive double-wall tubing in which an unbrazed, unsealed continuous double-wall tube of a given circumference is formed from a metal sheet composed of a first non-ferritic metal having a first defined region of exposed non-ferritic metal and a second region of a second metal in overlying relationship thereto, said exposed region having a width essentially equal to the circumference of the finished tube.

Abstract: Disclosed is a method of producing crack arrester consisting in that a hollow cylindrical blank (1) with a multi-layer wall and a discontinuity (2) provided at least in one of the layers is made so that the diameter and wall thickness thereof are smaller and greater, respectively, than the specified final dimensions of the crack arrester (5) and the blank (1) is then heated and rolled on a ring-rolling mill (4) uniformly over the entire length to the final dimensions of the crack arrester (5) so that the layers fuse to each other in the course of rolling.

Abstract: Metal annuli formed of chill cast metal for subsequent conversion into finished products are produced between at least one pair of inner and outer rollers forming between them a roll-pass, the outer one of which is driven and the inner one, of less diameter than the open central area of the annulus being formed and eccentrically positioned in said open central area, is free turning. Provision is made for moving the axis of rotation of the annulus being formd as the overall diameter increases in such manner that the relation between place of delivery of the hot strip with respect to the winding apparatus remains constant. Preferably the annulus forming apparatus is combined with a continuous casting apparatus whereby the formation of the strip and the forming of the annulus take place at the same speed.

Abstract: A method of manufacturing laminated shells for high pressure vessels and es comprising wrapping a metal sheet into a coil, welding the sheet end edges adjoining coil layers and joining adjacent layers by welding, wherein, with a view to increasing the process efficiency and providing for a tighter wrapping of the sheet and a higher structional strength adjacent; layers are joined together upon completion of coil wrapping by fusing at least three layers nearest to the overlapping layer along a line equidistant from the sheet end edge.