Abstract: The present invention relates to a process for the production of an aluminium multilayer brazing sheet which comprises a core layer made of a 3xxx alloy comprising 0.1 to 0.25 wt. % Mg, a brazing layer made of a 4xxx alloy on one or both sides of the core layer, and optionally an interlayer between the core layer and the brazing layer on one or both sides of the core layer, the process comprising the successive steps of: providing the layers to be assembled or simultaneous casting of the layers to obtain a sandwich; rolling of the resulting sandwich to obtain a sheet; and treating the surface of the sheet with an alkaline or acidic etchant.

Abstract: A medical guide wire which can have both slidability and operability and can be easily manufactured is provided. A medical guide wire includes a long flexible wire body, and a wire-like material structure including a wire-like material arranged on the surface of the wire body, in which the wire-like material structure is thermally fused onto the wire body.

Abstract: The present disclosure provides a bicycle frame including: a main frame; a support bracket formed separately from the main frame and bonded to a lower end portion of the main frame, and a motor mounting having a motor mounting portion configured to mount a motor therein, wherein the motor mounting bracket is formed separately from the support bracket, and is bonded to the support bracket.

Abstract: A system for applying an electrical stimulation includes a lead and a stylet slidably disposed within a lumen of the lead body and extending proximally therefrom. The lead includes a plurality of insulated conductor wires electrically isolated from one another and each having a distal segment terminating at distal end, an intermediate segment, and a proximal segment terminating at a proximal end, wherein the distal ends are electrically coupled to a respective one of the stimulating electrodes and the intermediate segments extend proximal the lead body and are characterized as having a non-coiled configuration.

Abstract: A method and apparatus manufactures a closed structure part without flange having a curvature and welded edges along a longitudinal direction of the part and further having a varying cross-sectional shape, from two metal plates. Each of two metal plates provided with a curvature along the longitudinal direction of the plate and provided with both ends in a width direction of the plate, are press-formed such that a folding line is formed at positions corresponding to a non-welded bent edge in a cross section of the part, and stacked on each other vertically such that their bulging sides face outward. Their left ends and right ends in the width direction are mutually welded along the longitudinal direction to form welded edges.

Abstract: A frame unit for a bicycle may include a left frame body in which a part of a head tube, a part of a seat tube, a part of a frame, and a left stay are integrally formed, and a right frame body in which a part of the head tube, a part of the seat tube, a part of the frame, and a right stay are integrally formed, wherein the left frame body and the right frame body may be coupled so as to integrally form the head tube, the seat tube, and the frame, and a seat pipe formed to have a cylinder shape by step-by-step press processing may be inserted into the seat tube and then coupled to the seat tube.

Abstract: A frame unit for a bicycle may include a left frame body in which a part of a seat tube, a part of a frame, and a left stay are integrally formed, and a right frame body in which a part of the seat tube, a part of the frame, and a right stay are integrally formed, and wherein the left frame body and the right frame body are joined to each other along edges of the left and right frame bodies so as to integrally form the head tube, the seat tube, and the frame.

Abstract: A liquid phase diffusion bonded pipe joint comprised of metal pipes or a metal pipe and a joint pipe joined by liquid phase diffusion bonding, the liquid phase diffusion bonded pipe joint comprised of a metal joint provided with a tapered slanted part press-fit into an end of a metal pipe by a thrust in a pipe axial direction while expanding the metal pipe in inside diameter and tightly engaging with the end and a joining surface part continuing from the tapered slanted part and joined with an end face of the metal pipe by liquid phase diffusion bonding and a metal pipe tightly engaging with the tapered slanted part in the expanded state and with an end face joined with the joining surface part by liquid phase diffusion bonding.

Abstract: A method of manufacturing a furcated composite post (1) comprising at least two strips (7, 8) that are joined together along their length in a furcated manner. The method comprises the steps of feeding one or more of the strips (7, 8) at a set rate to working rolls of a roll mill for profile rolling to a desired cross section/profile, feeding the strips (7, 8) at the same set rate to positioning rolls for holding the strips (7, 8) in a correct orientation for joining, and joining the strips together, preferably by welding the strips (7, 8) along their length.

Abstract: The present invention is a stirrer shaft pipe constituting a shaft of a stirrer for glass production formed by the shaft and a stirring blade protrusively provided at the shaft, having a multilayered structure of n layers (n=2 to 5) in which a plurality of pipes are laminated, wherein in at least the pipe of one layer of the plurality of pipes constituting the multilayered structure, a crystal grain aspect ratio (a longitudinal direction/a radial direction) in a material structure of a section in the longitudinal direction is 10 to 100, and a crystal grain aspect ratio (a circumferential direction/a sectional direction) in the material structure of a section in the circumferential direction is 5 to 100.

Abstract: A clad material includes a core material, a first skin material covering one side of the core material, and a second skin material covering the other side of the core material. The clad material is brazed in a state in which the first and second skin materials overlap each other. The core material is made of an Al alloy containing Mn (0.6 to 1.5 mass %), Ti (0.05 to 0.25 mass %), Cu (less than 0.05 mass %), Zn (less than 0.05 mass %), Fe (0.2 mass % or less), and Si (0.45 mass % or less) (balance: Al and unavoidable impurities). The first skin material is made of an Al alloy containing Si (6.8 to 11.0 mass %) and Zn (0.05 mass % or less) (balance: Al and unavoidable impurities). The second skin material is made of an Al alloy containing Si (4.0 to 6.0 mass %) and Cu (0.5 to 1.0 mass %) (balance: Al and unavoidable impurities).

Abstract: Methods are provided for joining two panels by welding together a seam formed at a flange of each panel using a welding tractor adapted to travel along the seam to be welded. A welding tractor adapted for use in the methods is also provided, as is a welded panel product fabricated using the methods provided.

Abstract: An apparatus and a process are disclosed for straw tube formation utilized in manufacturing boron coated straw neutron detectors. A preferred embodiment of the process for creating a thin walled straw for use in a boron-coated straw neutron detector comprises providing foil having a boron coating on a surface, forming the coated foil into a cylindrical tube having a longitudinal seam and the boron coated surface on the inside of the cylindrical tube, and then ultrasonically welding closed the seam of the tube. Optionally, the cylindrical tube can then be drawn through a die to form a straw tube having a non-circular cross section, preferably a star-shaped cross section.

Abstract: A method of forming a centralizer where a flat plate is created into a tubular where the flat plate is typically rolled so that two sides of the plate contact one another and are then linked, typically by welding. Openings are then created in the tubular such that there are no corners or other points that stress cracks may originate. Once the openings are created the remaining material between adjacent openings forms ribs. The openings created in the tubular are generally aligned with the long axis of the tubular. The material at the upper and lower end of the flat plate where openings were not created serve as circumferential collars. The ribs may be radially outwardly expanded in order to provide adequate stand-off. In many instances the ribs will also be hardened by heat treating or other hardening processes.

Abstract: A bicycle having a first tube with a first tube portion and a first weld portion. The first tube portion has a first tube portion thickness and the first weld portion has a first weld portion thickness. The first weld portion has a first mating surface. A second tube having a second tube portion and a second weld portion. The second tube portion has a second tube portion thickness and the second weld portion has a second weld portion thickness. The second weld portion has a second mating surface. The first mating surface is positioned adjacent to the second mating surface, forming a weld interface between the first tube and the second tube. A weld bead formed along the weld interface coupling the first weld portion and the second weld portion.

Abstract: An aluminium alloy extruded tube product for a heat exchanger assembly and made from an 1xxx-series aluminium alloys and including furthermore a purposive addition of one or more wetting elements selected from the group of: Bi 0.03% to 0.5%, Pb 0.03% to 0.5%, Sb 0.03% to 0.5%, Li 0.03% to 0.5%, Se 0.03% to 0.5%, Y 0.03% to 0.05%, Th 0.03% to 0.05%, and the sum of these elements being 0.5% or less.

Abstract: An apparatus and method for protecting an inner radial surface of a radial member of a turbomachine from corrosion are provided. The method may include shaping the inner radial surface of the radial member and a corresponding outer radial surface of a corrosion-resistant liner. The method may also include heating the radial member to increase a diameter of the inner radial surface of the radial member, and inserting at least a portion of the corrosion-resistant liner into the radial member. The method may further include attaching the corrosion-resistant liner to the inner radial surface of the radial member to thereby protect the inner radial surface of the radial member of the turbomachine from corrosion.

Abstract: A can rounding system and method that uses arms that are able to maintain cans in a concentric arrangement during the welding process. The arms enable the can rounding system to maintain the concentric positions in order to achieve improved circular dimensions and increase the overall efficiency in the construction of cylindrical and conical structures, such as wind towers.

Abstract: The current invention provides a drill pipe of standard weight with an integral wear pad. The drill pipe with integral wear pad provides increased durability while retaining the strength, flexibility, lightweight, and other performance characteristics of standard weight drill pipe. The current invention also provides methods for making a standard weight drill pipe with integral wear pad.

Abstract: A method for forming structural equipment employed in sulfur containing environments such as oil refineries and the like. In one embodiment, the method comprises: providing a steel composition containing up to 0.35% of C, 0.30 to 3.5% Si, up to 1.2% Mo, up to 1.35% Mn, up to 5% Al, less than 12.0% Cr, balance of Fe and unavoidable impurities; forming a structural component conforming to prevailing industry standards with respect to design, fabrication, inspection and testing, metallurgical and mechanical properties. The structural equipment has a corrosion rate of less than 15 mpy. In one embodiment, the equipment is formed from a steel composition has a carbon equivalent of less than 0.63, requiring no post weld heat treatment (“PWHT”). In another embodiment, the CE is less than 0.45, requiring no preheat nor PWHT.

Abstract: A belt integrated seat tower for a seat system. The seat tower can include a single piece of bent sheet metal in the form of an elongated discontinuous section tube having a first longitudinal edge and a second longitudinal edge adjacent to the first longitudinal edge. A butt weld can join the first and second longitudinal edges to form a lapless seam and a generally flat weld surface.

Abstract: The present disclosure relates to various vehicle cross-member assemblies and methods of manufacturing the same. The various vehicle cross-member assemblies have rails composed of dissimilar materials.

Abstract: Provided is a superconducting accelerator cavity and a method thereof with which product reliability can be enhanced and manufacturing costs can be reduced. A method of manufacturing a superconducting accelerator cavity includes a beam-pipe forming stage of forming a beam pipe by processing a superconducting material into a tube shape; an end-plate joining stage of joining, by welding, an inner circumferential surface of an end plate formed in a shape of a ring that forms an end of a jacket, which accommodates coolant, to an outer circumferential portion of an end in the beam pipe formed in the beam-pipe forming stage; and an end-cell joining stage of joining, by welding, an iris portion of an end cell, which is formed of a superconducting material in a shape of a ring so as to form a cavity portion, to an inner circumferential portion of the end of the beam pipe.

Abstract: Two thin-walled jackets a joined by preparing end faces of the jackets by plastically deforming and upsetting microprojections thereon and thereby forming the metal of the upset microprojections into annular beads on inner surfaces of the respective jackets. Then the end faces are abutted while centering the jackets on each other relative to their external diameters. The end faces are then spot welded together in a plane where the end faces abut and then joined with a continuous main weld having a width equal to between four and six times the thickness of the wall of the jackets. Heat is then extracted from the welded jackets starting at a distance not exceeding times the wall thickness from a joint center line where the end faces abut.

Abstract: The present invention provides high strength steel plate with excellent low temperature toughness, high strength steel pipe using this as a base metal, and methods of production of the same. The steel plate of the present invention contains Mo: 0.05 to 1.00% and B: 0.0003 to 0.0100%, has a Ceq of 0.30 to 0.53, has a Pcm of 0.10 to 0.20, and has a metal structure which has an area percentage of polygonal ferrite of 20 to 90% and has a balance of a hard phase comprised of one or both of bainite and martensite. To obtain this steel plate, strain-introducing rolling is performed with a start temperature of not more than Ar3+60° C., an end temperature of Ar3 or more, and a reduction ratio of 1.5 or more, then the plate is air-cooled and then acceleratedly cooled from Ar3?100° C. to Ar3?10° C. in temperature by 10° C./s or more.

Abstract: The present invention provides high strength thick welded steel pipe for line pipe superior in low temperature toughness, and a method of production of the same. A base material steel plate containing C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, Al: 0.020% or less, Ti: 0.003 to 0.030%, and Mo: 0.10 to 1.50%, having a carbon equivalent Ceq of 0.30 to 0.53, having a crack susceptability parameter Pcm of 0.10 to 0.20, satisfying formula 3, comprised an area ratio of 20% or less of polygonal ferrite and an area ratio of 80% or more of bainite, and having an effective crystal grain size of 20 ?m or less is formed into a pipe shape, then seam welded to make the effective crystal grain size of the heat affected zone 150 ?m or less: 10C+100Al+5Mo+5Ni<3.3??formula 3.

Abstract: According to the preferred embodiment, an improved method and apparatus for the manufacturing of an aluminum tube and aluminum fin heat exchanger that includes steps for pneumatic cleaning, thermal cleaning, and uncontrolled-atmosphere open-flame autobrazing of hairpins to return bend fittings. The method uses a tube lubrication system that is adjustable to control amount of lubrication applied to the tube prior to final expansion. The method uses a pneumatic coil cleaning station that is adjusted to reduce the residual oil particulate from the expansion process required to be thermally cleaned.

Abstract: An aluminum strip for a component, in particular a brazing component, in particular a tube or a disk, includes a profile having a brazing connection, wherein in at least one area, in particular in the area of the brazing connection: a first part of the strip thickness is taken up by a core layer of a first aluminum alloy; at least a second part of the strip thickness is taken up by at least one plating layer of a second aluminum alloy, wherein the first and the second aluminum alloy are configured to form a “brown band” layer during a brazing process; and at least a third part of the strip thickness is taken up by at least one “brown band” layer that is formed out of the first and the second aluminum alloy during the brazing process, and wherein a strip thickness of the aluminum strip is less than 500 ?m and a thickness of the core layer and/or a thickness of the plating layer is configured such that after the brazing process at least 5% of the strip thickness that is taken up by the first aluminum alloy of t

Abstract: The invention relates to a method for producing a metal sheet (7) with a welded-on tube (6) which has at least partially curved sections, wherein the tube (6) is guided by at least one guide element (2) onto the metal sheet (7), is pressed thereon with at least one pressure element (3) and is welded thereto at least at some points and wherein the tube (6) is bent to form the curved sections. In order to achieve the welding-on in a simple manner even in the curved sections, it is provided according to the invention that a bending is carried out in a plurality of discrete steps, wherein in individual steps firstly the tube (6) is bent with the at least one guide element (2) around a last created welding point and thereafter a new welding point is created. Furthermore, the invention relates to a device (1) for carrying out the method.

Abstract: The present invention provides high strength welded steel pipe for line pipe inexpensive in cost and superior in low temperature toughness, and a method of production of the same, produced by forming a base material steel plate containing, by mass %, C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, S: 0.0001 to 0.0050%, and Ti: 0.003 to 0.030%, limiting Al to 0.020% or less and Mo to less than 0.10%, having a carbon equivalent Ceq of 0.30 to 0.53 and a crack susceptibility parameter Pcm of 0.10 to 0.20, comprised of polygonal ferrite and residual bainite of an area rate of 20% or less, and having an effective crystal grain size of 20 ?m or less, into a pipe shape, then seam welding it and making the effective crystal grain size of the heat affected zone 150 ?m or less.

Abstract: A method for production of spacers to hold at least a number of elongated fuel rods (5) in a fuel unit (20) for placement in a re-actor (1) is described. The method comprises the steps of providing at least two spacers (30), to provide a set of mandrels (40) comprising a number of mandrels (42), to arrange at least two spacers (30) with one on top of the other on the set of mandrels (40), and to heat treat the spacers (30) when they are arranged on the set of mandrels (40) so that the cells (31) in the spacers (30) adapts to the mandrels (42).

Abstract: The other end of a hub portion is located farther from an attachment portion at a lateral portion, which is located in a lateral direction with respect to the vehicle, than at a vertical portion, which is located in a vertical direction with respect to the vehicle. The vertical portion of the hub portion has a concave end face on the side of the other end of the hub portion, which is formed to get closer to the attachment portion as the concave end face approaches a portion closest to the attachment portion substantially at the center of the hub portion in the lateral direction.

Abstract: A process for connecting a tube stabilizer part of a divided tube stabilizer with an intermediate element, such as an actuator or shift transmission. The process steps include providing the tube stabilizer part, providing the intermediate element, widening an end-side section of the tube stabilizer part using a conical mandrel, and bending the tube stabilizer part, and connecting the tube stabilizer part with the intermediate element.

Abstract: A brazed tube assembly and a joining method thereof using brazing, are disclosed. The tube assembly using brazing includes a pre brazed joint assembly method to form a fully pre assembled and locked component prior to brazing.

Abstract: This invention pertains to a process for producing shaped components from high-strength and ultra high-strength steels with tensile strengths >780 MPa, wherein a steel sheet-metal strip is fed to a roll-forming installation and in the roll-forming installation is passed through roll stands and deformed by means of deformation rollers acting on the steel sheet, and wherein to avoid hydrogen embrittlement in plastically deformed regions of the deformed steel sheet-metal strip compressive stresses are introduced by stamping and/or upset-forging and/or overbending and bending-back or by machining the strip edges.

Abstract: The present invention provides high strength welded steel pipe for line pipe inexpensive in cost and superior in low temperature toughness, and a method of production of the same, produced by forming a base material steel plate containing, by mass %, C: 0.010 to 0.050%, Si: 0.01 to 0.50%, Mn: 0.50 to 2.00%, S: 0.0001 to 0.0050%, and Ti: 0.003 to 0.030%, limiting Al to 0.020% or less and Mo to less than 0.10%, having a carbon equivalent Ceq of 0.30 to 0.53 and a crack susceptibility parameter Pcm of 0.10 to 0.20, comprised of polygonal ferrite and residual bainite of an area rate of 20% or less, and having an effective crystal grain size of 20 ?m or less, into a pipe shape, then seam welding it and making the effective crystal grain size of the heat affected zone 150 ?m or less.

Abstract: An implantable cardiac electrotherapy lead is disclosed herein. The lead may include an electrode on a distal portion of the lead, a conductor extending proximally through the lead from the electrode, and a crimp connector coupling a distal end of the conductor to the electrode. The connector may include a body with an outer surface, an inner surface, proximal and distal ends, a cavity, and at least one splice opening. The inner surface defines the cavity, the proximal and distal ends respectively define proximal and distal openings leading to the cavity, and the at least one splice opening extends from the outer surface to the inner surface and is oriented generally transverse to an axis extending between the proximal and distal openings.

Abstract: The invention relates to a device (1) for production of a tube (2) with a polygonal, preferably rectangular cross-section, comprising a tube welding unit (3), in which the tube (2) is formed from a sheet metal strip and welded at the resulting jointing position and a rolling unit (4), connected to the tube welding unit (3) in the transport direction (R) of the tube (2), which essentially rolls the tube (2) into the desired polygonal cross-sectional contour. According to the invention, right-angled tubes may be produced with the optimal geometry, whereby a camber rolling unit (5) is arranged in series with the rolling unit (4) in the transport direction (R) of the tube (2), by means of which at least two opposing tube sides (6, 7) may be rolled with a pair of crowned convex rollers (8, 9).

Abstract: An extrudable aluminum alloy composition includes, in weight percent, between 0.60 and 0.90 manganese, between 0.45 and 0.75 copper, between 0.05 and 0.24 magnesium, less than 0.30 iron, less than 0.30 silicon, less than 0.05 titanium, less than 0.05 vanadium, and a Cu/Mg ratio higher or equal to 3. It also relates to aluminum alloy heat exchanger extruded or drawn tube and extruded or drawn aluminum alloy tubing having the above-described aluminum alloy composition. It also relates to a heat exchanger comprising a plurality of extruded or drawn tube sections having the above-described aluminum alloy composition and a process for manufacturing same.

Abstract: The invention relates to a branch connection stub for connection to a main pipe. The branch connection stub presents an outside surface of revolution and has at least one axial internal passage, a rear segment with a fastener flange, an intermediate segment, and a front segment having a free end presenting a circular outline suitable for being mounting by plane welding around a circular opening in the wall of the main pipe, said intermediate segment comprising a first wall and a second wall forming between them an acute angle towards the internal passage. The invention is applicable to a hot heat exchanger for rocket engines.

Abstract: An expandable tubular liner includes a first tube, a second tube, a mechanical coupling for coupling the first and second tubes, and an insert coupled to the mechanical coupling. The insert is capable of forming a metallurgical bond with at least one of the tubes when energy is injected into the insert.

Abstract: This invention discloses a method, using pure niobium as a transient liquid reactive braze material, for fabrication of cellular or honeycomb structures, wire space-frames or other sparse builtup structures or discrete articles using Nitinol (near equiatomic titanium-nickel alloy) and related shape-memory and superelastic alloys. Nitinol shape memory alloys (SMAs), acquired in a form such as corrugated sheet, discrete tubes or wires, may be joined together using the newly discovered technique. Pure niobium when brought into contact with Nitinol at elevated temperature, liquefies at temperatures below the melting point and flows readily into capillary spaces between the elements to be joined, thus forming a strong joint. A series of diagrams of the interface at various stages of brazing is illustrated by FIG. 10.

Abstract: A gear pump having an inner rotor and an outer rotor is covered by a cylindrical outer casing and side casings. The cylindrical outer casing has two outer circumferential edges which are welded over the entire circumference thereof to the outer edges of the side casings, respectively. The outer casing has two angularly spaced recesses in its inner periphery for receiving slide seals therein. Welding is started at a welding start point which is 90 degrees spaced from the middle point between two recesses. During welding, welding energies are applied to the welding start point and the middle point between two recesses. Those energies tend to deform the casing into oval shapes that are 90 degrees out of phase from each other. Thus, these energies cancel each other, thereby preventing the casing from being deformed.

Abstract: A manufacturing method for an outer shell unit (10) provided with a cylindrical outer shell (3) housing a damping force generating mechanism and a knuckle bracket (7) mounted on the outer shell (3) to connect a knuckle. The knuckle bracket (7) is fixed by welding to the outer shell (3) after closing the bottom (31) of the outer shell (3) with a closing process. Consequently productivity is increased due to the fact that the number of processing operations for cutting an inlay and the number of operations for assembling the lower cap are reduced because the bottom is formed using a closing process. Furthermore productivity is increased since it is not necessary to seal the bottom by welding since the sealing characteristics of the bottom of the outer shell are ensured by the closing process.

Abstract: A layered article having a curved surface made of a supporting metal metallurgically bonded to a supported metal.

Abstract: A method for metallurgically joining a tube to a member. A tube having a flange is obtained, and a member is obtained. The tube and the member are positioned with the flange contacting the member directly and/or indirectly through an intervening welding/brazing joining material. The flange and/or the member is segmented and their contact is a segmented contact at spaced-apart contact areas between the flange and the member. A resistance welding/brazing current path is created,through the tube and the member at a first contact area creating a first weld/braze zone which includes at least some of the flange and at least some of the member. Then, a resistance welding/brazing current path is created through the tube and the member at a different second contact area creating a second weld/braze zone which includes at least some of the flange and at least some of the member.

Abstract: The high yield ratio problem intrinsic in high-strength steel pipes is solved and a method of producing a steel pipe, while securing the pipe roundness is provided. A steel pipe produced from a steel plate by forming and welding is subjected to 0.3 to 1.2% of expansion and then to 0.1 to 1.0% of reduction. The steel pipe produced by this method has a structure in which martensite and/or bainite accounts for more than 80% as expressed in terms of area percentage, and has a yield strength of not lower than 551 MPa and a yield ratio of not higher than 93%. The pipe reduction is desirably carried out at a lower work ratio as compared with the pipe expansion.

Abstract: An apparatus for welding closed one end of each of a multiplicity of open-ended tubes suitable for use as brachytherapy capsules includes a welding station having a welding position for welding closed one end of a tube, a rotatable platform having an outside edge, a tube holder positioned adjacent the outside edge, the tube holder movable between a loading position and the welding position, and a feed line positioned in overlying registry with the tube holder at the loading position.

Abstract: A steel pipe is welded to a threaded connector that has an end with a desired nominal inner diameter. A swage is forced over an end of the pipe, reducing an outer diameter and an initial inner diameter of the end of the pipe. A die is then forced into the end of the pipe, the die having an outer diameter sized to increase the inner diameter of the end of the pipe to the nominal inner diameter of the end of the connector. A weld groove is machined on the end of the pipe and the ends are abutted and welded at the weld grooves.

Abstract: A method for manufacturing a fuel inlet having a good sealing property and a screw structure formed in a precise position involves expanding one end of a long-length stainless pipe (metal pipe) using a cored bar, the tip of the expanded portion which becomes non-uniform as a result of the expanding step is cut off, a screw structure is formed in the expanded portion by using a punch, the tip of the expanded portion which becomes non-uniform as a result of the screw structure forming step is cut off, and thereafter curl forming is conducted to the end of the expanded portion which becomes uniform by using a die so as to provide a seal portion.