Abstract: This invention relates to a process for the manufacture of an elongated tube, the process comprising the following steps: (a) forming a rotating temporary tube (1), the tube having a first end at which the tube is continuously produced and a second end opposite to the first end, by continuously supplying a flat, elongated metal strip to a guiding body, which guiding body is forming a helix from the strip in such a way that consecutive windings of the helix do not overlap, and helically welding the consecutive windings of the helix formed by the guiding body to each other, (b) cutting cylinders from the second end of the rotating temporary tube (1); and (c) welding the cylinders obtained in step (b) to each other to form the elongated tube. The invention further relates to the use of the elongated tube in a process for the manufacture of an elongated, multilayered tubular body.

Abstract: A continuous welding machine (1) for welding facing sides of a pipe blank (15) bent from a material blank is provided, having a guide strut (2) for guiding the sides of the blank (15) to be welded to each other in the direction toward a welding device (3). Pipe guides (4, 5) arranged about a periphery of the guide track designed for the pipe blank (15). For the continuous welding machine (1) according to the invention, the pipe guides (4, 5) and the guide strut (2) are adjustable in the radial direction relative to a guide axis (7) for adapting to different pipe diameters, and the guide tracks (8, 9) of the guide strut (2) allocated to the sides of the pipe blank (15) to be welded and also arranged on opposite sides of the guide strut (2) are arranged at an angle to each other in a plane extending through the guide axis (7). With the help of the continuous welding machine according to the invention, selected pipes with different pipe diameters can be produced alternately.

Abstract: A roll-forming or bending machine is provided for forming an angled or rounded and simultaneously tapered hollow body or similar workpiece from a material blank. The machine has at least one tapered roll and at least one counter element, between which a forming pressure can be applied to the material blank. The one counter element has an elastic surface and is constructed as a bending table for supporting the material blanks, so that the one or more rolls apply forming pressure on the material blank on the bending table. The bending table is guided so that it can move in the longitudinal direction and can rotate about a rotational axis, and the rolls can move perpendicular to the longitudinal direction, allowing a change in the relative position of the roll and rotational axis of the bending table caused by a rotational movement of the bending table to be compensated.

Abstract: A continuous welding machine (1) for welding facing sides of a pipe blank (15) bent from a material blank is provided, having a guide strut (2) for guiding the sides of the blank (15) to be welded to each other in the direction toward a welding device (3). Pipe guides (4, 5) arranged about a periphery of the guide track designed for the pipe blank (15). For the continuous welding machine (1) according to the invention, the pipe guides (4, 5) and the guide strut (2) are adjustable in the radial direction relative to a guide axis (7) for adapting to different pipe diameters, and the guide tracks (8, 9) of the guide strut (2) allocated to the sides of the pipe blank (15) to be welded and also arranged on opposite sides of the guide strut (2) are arranged at an angle to each other in a plane extending through the guide axis (7). With the help of the continuous welding machine according to the invention, selected pipes with different pipe diameters can be produced alternately.

Abstract: A roll-forming or bending machine (1) is provided for forming an angled or rounded and simultaneously tapered hollow body or similar workpiece from a material blank. The roll-forming or bending machine (1) has at least one tapered roll (2) and at least one counter element, between which a forming pressure can be applied to the material blank. The one counter element has an elastic surface and is constructed as a bending table (3) for supporting the material blanks, so that the one or more rolls (2) apply the forming pressure on the material blank on the bending table (3). The bending table (3) is guided so that it can move in the longitudinal direction and can rotate about a rotational axis (5), and the one or more rolls can move perpendicular to the longitudinal direction, allowing a change in the relative position of the roll (2) and rotational axis (5) of the bending table (3) caused by a rotational movement of the bending table (3) to be compensated.

Abstract: An apparatus (1) for manufacturing tubes made from thin-walled material, especially made from sheet metal, with a welding machine for longitudinal-seam welding, as well as with a clamping device (2), which has clamping jaws, which are arranged on opposite sides of the tube blank (3) and which can be pressed against the tube blank (3) for holding a tubular, preformed blank in the welding position. The clamping jaws (4) each have a stack of pressure plates (5), which contact each other on the flat sides thereof, and which contact the tube blank (3) on the narrow sides thereof in a contact region (6), and which can be pressed against the tube blank (3). The plate stacks are adapted to the outer contours of the tube blank (3) in the contact region (6). Through the use of the apparatus according to the invention, a uniform and uniformly load-bearing weld seam can be achieved, even for contoured tubes, which have outer diameters that vary along the course of their longitudinal extent.

Abstract: An apparatus (1) for manufacturing tubes made from thin-walled material, especially made from sheet metal, with a welding machine for longitudinal-seam welding, as well as with a clamping device (2), which has clamping jaws, which are arranged on opposite sides of the tube blank (3) and which can be pressed against the tube blank (3) for holding a tubular, preformed blank in the welding position. The clamping jaws (4) each have a stack of pressure plates (5), which contact each other on the flat sides thereof, and which contact the tube blank (3) on the narrow sides thereof in a contact region (6), and which can be pressed against the tube blank (3). The plate stacks are adapted to the outer contours of the tube blank (3) in the contact region (6). Through the use of the apparatus according to the invention, a uniform and uniformly load-bearing weld seam can be achieved, even for contoured tubes, which have outer diameters that vary along the course of their longitudinal extent.

Abstract: Two endless flexible conveying strands (22, 24) run, parallel to one another, over a drive mechanism (26, 28), a guide mechanism (30, 32, 34) and a conveying track for the body blanks (10). The two conveying strands (22, 24) are displaceable in relation to one another to a limited extent in their longitudinal direction in operation. Pusher dogs (46, 48) are secured one behind the other to the conveying strands (22, 24) with equal spacing so that situated opposite each pusher dog (46) on one conveying strand (22) is a pusher dog (48) on the other conveying strand (24) so that these two associated pusher dogs together push a can body blank (10) over the conveying track to a welding apparatus (20). The pusher dogs (46, 48) each have a lateral projection (50, 52). Disposed on the conveying track, upstream of the welding apparatus (20), at a distance from this which coincides at least approximately to the length of the can body blanks (10), is a pair of adjusting templates (62, 64).

Abstract: On a machine for welding the longitudinal edges (12,14) of rounded body blanks (10), two groups of movable guide elements (36), which exert radial guiding forces on the blanks (10), are arranged lying opposite one another with respect to the blanks. The guide elements (36) of each of the two groups are secured to an endless chain (38). Each of these chains (38) has a chain strand extending in the direction of movement (axis A) of the blanks (10), which strand is supported by a rail (52) at both sides of a welding plane (B) containing the welding zone and normal to the direction of movement of the blanks (10). The guide elements (36) move through the welding plane (B) with the blanks (10). As a result, shock-like actions on the blanks (10) in the vicinity of the welding plane (B) are avoided; consequently, the longitudinal edges (12,14) can be welded together particularly evenly, particularly by means of a laser beam.

Abstract: Plane, rectangular sheets (10) are moved through between a driven bending roll (32) and a plurality of back-up rolls (34) and are bent round the bending roll (32) by these rolls and a plurality of pressure rolls (52, 56) disposed behind the bending roll (32) and back-up rolls (34). The almost completely rounded sheet (10) is bent resiliently away from the bending roll (32) by a deflecting member (62) as a result of which the front edge (10a) of the sheet is prevented from re-entering the gap between the bending roll (32) and the back-up rolls (34) before the rear edge (10b) of the sheet has travelled through this gap. Then the deflecting member (62) is moved back into its position of rest so that the front region of the sheet (10) springs back in the direction of the bending roll (32) and as a result is again gripped by the bending roll (32) and the back-up rolls (34) and moved through between them.

Abstract: The body blanks (10) are moved through, with overlapping longitudinal edges, between an inner and an outer electrode roller (14, 24), the axes (16, 26) of which lie substantially in a common plane (II--II) normal to the direction (A) of the axes of the body blanks (10). Also lying in this plane (II--II) are the axes of a plurality of sizing rollers (34, 36, 38) which are disposed in a ring and one of which (38) is disposed diametrically opposite to the outer electrode roller (24). This sizing roller (38) and a guide roller (42) which is disposed in front of it in the direction (A) of the axes of the body blanks (10) are encircled jointly by an endless conveyor element (46). The guide roller (42) and hence also the conveyor element (46) can be driven by a servomotor (50) which is controlled according to the signals of an angle-of-rotation transmitter (30) rotating with the outer electrode roller (24).

Abstract: A welding machine with wire electrodes is used to electrically resistance roll seam weld tin plate. Only one electrode wire running over both of the electrode carrying rolls is used. To prevent the formation of a loop in the wire stretch between the electrode carrying rolls a hard wire is required which is produced by a prior rolling of a soft round wire. With this rolling there results however a non-uniform hardness distribution over the wire cross section with areas of high and areas of low material hardness so that the average strength increase over the entire wire cross section of the electrode wire remains below the increase in strength which could theoretically be reached if no portion of the wire cross section remained outside of the area of high material strength.

Abstract: In a method for electrical resistance roll seam welding with a single electrode-wire, wherein the electrode-wire runs over first and second electrode carrier-rolls urged against each other, and the strength of the electrode-wire is increased by rolling-out before it enters the first electrode carrier-roll, elongations of the electrode-wire which can otherwise arise and lead to a slippage of the electrode-wire at the welding point and therefore, deleteriously affect the weld-quality can be largely prevented by reducing the electrode-wire temperature at the welding-point by cooling with a cooling device (17) the electrode-wire (12) between its rolling-out point (17/18) and its passage onto the first electrode carrier-roll (14) and/or between its departure from electrode carrier-roll (14) and its passage onto the second electrode carrier-roll (15).

Abstract: In an apparatus and a method of at least partially suppressing oxidation of can components or the like during resistance roller welding with the aid of an inert gas, the steps include welding the can components to one another, so as to obtain a hot welding seam, supplying the inert gas to the hot welding seam so as to envelop it at least partially, and to create a region of the inert gas in contact with the surrounding atmosphere, so that oxidation of the hot welding seam is at least partially suppressed.

Abstract: In an apparatus and a method of at least partially suppressing oxidation of can components or the like during resistance roller welding with the aid of an inert gas, the steps include welding the can components to one another, so as to obtain a hot welding seam, supplying the inert gas to the hot welding seam so as to envelop it at least partially, and to create a region of the inert gas in contact with the surrounding atmosphere, so that oxidation of the hot welding seam is at least partially suppressed.