Abstract: An impeder for use in an electric induction welding process is provided. A cooling medium is circulated centrally through the impeder's magnetic material with the impeder entry and exit passages for the cooling medium located on opposite sides of the impeder.

Abstract: An impeder for use in an electric induction welding process is provided. Optionally the impeder does not require internal forced cooling. In embodiments using internal forced cooling a high efficiency cooling system is provided.

Abstract: An impeder for use in an electric induction welding process is provided. Optionally the impeder does not require internal forced cooling. In embodiments using internal forced cooling a high efficiency cooling system is provided.

Abstract: An impeder for use in an electric induction welding process is provided. A cooling medium is circulated centrally through the impeder's magnetic material and between the interior of the impeder's high temperature enclosure and the exterior of the magnetic material within the impeder with the impeder entry and exit passages for the cooling medium located on the same side of the impeder.

Abstract: An impeder for use in an electric induction welding process is provided. Optionally the impeder does not require internal forced cooling. In embodiments using internal forced cooling a high efficiency cooling system is provided.

Abstract: Device for welding a moving packaging material (1) including a layer that can be heated by electromagnetic induction and a thermoplastic layer incorporating a welding zone (2) which lies in the direction of movement of the packaging material; the welding device includes an alternating current generator, a coil (3, 5, 6) for transforming the alternating current into a magnetic field, a ferromagnetic element (7, 8, 10–13) for channeling the magnetic field lines in a specific direction, the magnetic field being oriented so s to cross the packaging material (1) in order to induce heating of the layer that can be heated by electromagnetic induction; the welding device being characterized in that it includes a set of ferromagnetic elements (7, 8, 10–13, 19–21) which are arranged so that the magnetic field lines cross the packaging material (1) in at least two distinct regions (14, 16–18) located along the welding zone (2).

Abstract: An impeder, for manufacturing a welded pipe, including an insulating case 4 containing laminations 10 having coated steel sheets 8 formed by providing an insulating coating on untreated steel sheets having a thickness of 0.3 mm or less and an insulating case 8 containing the laminations, wherein the steel sheets contain 1.5-20% of Cr, 2.5-10% of Si, and 100 ppm or less of C and N in total, or further contain one or more of Al, Mn, and P, where the content of Al is 5% or less and the content of each of Mn and P is 1% or less, the remainder being Fe and unavoidable impurities; and preferably have a resistivity of 60 ??·cm or more.

Abstract: An impeder, for manufacturing a welded pipe, including an insulating case 4 containing laminations 10 having coated steel sheets 8 formed by providing an insulating coating on untreated steel sheets having a thickness of 0.3 mm or less and an insulating case 8 containing the laminations, wherein the steel sheets contain 1.5-20% of Cr, 2.5-10% of Si, and 100 ppm or less of C and N in total, or further contain one or more of Al, Mn, and P, where the content of Al is 5% or less and the content of each of Mn and P is 1% or less, the remainder being Fe and unavoidable impurities; and preferably have a resistivity of 60 &mgr;&OHgr;·cm or more.

Abstract: A profiled end cut is applied to a length of stock pipe in an apparatus wherein the pipe is rotated by a drive head with a plasma cutter moved axially on a trolley in synchrony with rotation under control of a guidance system. The guidance system follows a desired pattern to effect two adjoining end cuts in a single continuous operation. Pipe handling is effected by two sets of rollers, a support set permitting rotation and a lifting set to enable axial movement.

Abstract: Sheet metal edges to be welded are preheated prior to welding. At a given welding speed, this results in a smaller temperature gradient in the material to be welded. Consequently the welding speed can be increased, or material which would otherwise provide poor weld quality can be welded at a high temperature gradient. The preheating is carried out for example by high-frequency excitation of the material to be welded.

Abstract: There is provided a method for the manufacture of a welded tube having an enhanced inner wall. A fin insert shapes the edges of a metallic strip prior to welding and minimizes the formation of a weld bead inside the tube. The portion of the edge of the metallic strip adjacent the outer surface of the tube is formed to a first angle, while that portion of the edge adjacent an inner wall of the tube is formed to a second, lesser angle.

Abstract: A mechanism and method for counteracting and removing the twist of a rolled metal strip being formed into a tube by a tube forming machine. The mechanism has a frame rotatably mounted to the tube forming machine between the forming rolls and the seam guide. A pair of edge rolls are attached to the frame and are engageable with the opposing longitudinal edges of the rolled metal strip. Backing rolls, also attached to the frame, inhibit the transverse displacement of the rolled metal strip by the engagement of the edge rolls with the longitudinal edges of the metal strip. An adjustment screw rotates the frame relative to the tube forming machine about a longitudinal axis to align the longitudinal edges of the rolled metal strip with a seam guide prior to welding the longitudinal edges to each other.

Abstract: A welded tapered tube is made by deforming a flat, elongated trapezoidal sheet of metal into an elongated, U-shaped trough in a wagon open at its top and having a U-shaped trough for a bottom. The wagon moves along a track to carry the U-shaped sheet past a series of fin rolls, which deform the U-shaped sheet into an oval-shaped, tapered tube with a seam running the length of the tube. The wagon and tube thereafter move past a welding station where the seam is forged and welded together to form an elongated, tapered tube with an oval-shaped cross section, which may be squeezed between two elongated and semicircular die cavities to form a tapered tube of circular cross section.

Abstract: An apparatus for guiding can bodies in a laser welding machine is described. The apparatus comprises a water-cooled holding-down shoe (22) with an integrated holding-down roller (24), gas supply (64) and suction extraction (68), the holding-down roller (24) being disposed in front of the theoretical point of intersection of the two edges of the body to be butt-welded and being adjustable in height, with the holding-down shoe (22), to the thickness of the sheet metal. Adjacent to the holding-down shoe (22) is a holding-up shoe (26) and adjacent to the holding-down roller (24) is a holding-up roller (28). Provided below the holding-up shoe (26) is a horizontally and vertically adjustable supporting roller (30) which supports the can bodies at their underside during the welding operation and during passage through the welding plane (10).

Abstract: To make a container with a butt welded longitudinal seam, the side edges of a preformed blank are guided by straight grooves so that the side edges converge at an acute angle. At the point of convergence the side edges are heated to at least to the forging temperature, preferably by a focused laser beam. The side edges are then tangentially compressed before they cool.

Abstract: In order to hold the longitudinal edges (12, 14) of a can body (10) which are to be butt-welded together contiguous with one another on the way to a welding apparatus (52), the can body (10) is moved past a magnet (40) by means of which the longitudinal edges (12, 14) are magnetized with opposite polarity. The two poles (N.sub.S, S.sub.N) of the magnet (40) each have a supporting surface (42, 44) for a conveyor belt (36) which conveys can bodies (10) one behind the other from a guide member (22) to the welding apparatus (52).

Abstract: On a machine for welding together the longitudinal edges (12, 14) of rounded sheet-metal container body blanks there are disposed a plurality of rings (24) of rollers round a common longitudinal axis (22), one behind the other in the direction of passage through (A) of the blanks (10). At least some (28) of the rollers (26, 28) of the rings (24) of rollers are each mounted on a roller carrier (40) which is adjustable in the direction away from the longitudinal axis (22) against resilient resistance. The roller carriers (40) are guided in a manner which enables the associated rollers (28) to execute yielding movements at an angle of distinctly less than 90.degree. to the direction of passage through (A) of the blanks (10). For this purpose, the roller carriers (40) are each pivotable about a transverse pin (42) which is disposed at least substantially parallel to the associated roller spindle (38), upstream of this with respect to the direction of passage through (A) of the blanks (10).

Abstract: A blank guide device for a resistance welding machine guides cylindrically-rolled blanks employed to produce can bodies to the welding point. The blank guide device includes a pair of blocks respectively constituting opposed L-shaped surfaces in place of a conventional Z-shaped guide portion.

Abstract: A guide rail serves for bringing together the edges of blanks of sheet metal rolled to form cylinders. The guide rail contains curved guide slots for the sheet metal edges. The guide slot bases are planar and converge toward the exit end of the guide rail. The sheet metal edges guided in the curved guide slots tend--after a first weld point has been made--to translate toward one another due to their innate elasticity.

Abstract: Described herein is an invention that belongs to the technical field of machines for effecting lap welding operations and relates, in particular, to a device for positioning the metal ends of strips destined, once the said ends are joined one to the other, to constitute can bodies.Envisaged by the invention is a device in which the slots for housing the ends to be welded are defined by at least one pair of guide blocks that are substantially opposed and are shaped in the form of a step in such a way that each constitutes means of abutment for one of the said ends and supporting surfaces for both of the said ends. Advantageously, at least one block in the said at least one pair of blocks can be set with respect to the other.

Abstract: An alignment tool is provided for use in a metal cylindrical can welding machine which is an integral unit constructed of discrete component parts comprising an insulating part and a guide part of high strength and hardness. The insulating part prevents electrical current from passing through the alignment tool thereby preventing spark erosion, increased wear and inefficiency. The high strength part provides the necessary characteristics required for guiding the edges of the can body blanks to the welding rollers and can be selectively replaced for repair or modification thereby reducing repair costs.

Abstract: Methods and apparatus for manufacturing tapered, hollow metal poles which can be used for manufacturing poles of various lengths, tapers and cross-sectional dimensions with the same apparatus. A substantially complete, tapered tube is formed from a plate or sheet of metal having lips at its longitudinal side edges which extend transversely to the major surface of the plate or sheet. The tube is guided at its lip portions to a weld point where pressure is applied to force the lips together by a grooved roller which applies pressure to the oppositely facing surfaces of the lips in directions transverse to such surfaces. The lips are spaced in advance of the weld point, and high frequency, electric heating current is supplied to the tube at opposite sides of the gap between the lips to heat the tube at the lips to welding temperature as it is advanced to the weld point.

Abstract: The bellows sections welder according to the invention comprises a bed carrying a stationary support and a movable support with a driver chuck and a driven chuck, respectively, which chucks are kinematically interconnected. The bed further carries a welding torch and a yoke disposed between the chucks and intended for centering the ends of bellows sections being welded. The movable support is driven by at least two pneumatic cylinders symmetrically arranged with respect to the longitudinal axis of the welder. Viewed in the direction of the work movement, the movable support is preceded by adjustable stops and followed by a means to receive welded bellows sections.

Abstract: A resistance welding machine for seam welding blanks or bodies or the like, comprising a guide device arranged in front of the electrode rolls for producing an exactly determined overlapping of the edges of the blanks or bodies and for guiding the overlapped blank edges to the welding point between the electrode rolls. Adjustment of a movable section of the guide device aligns the guide device at the welding point.