Abstract: Components of the printing device are attached by a process employing thermo-compressive welding. The process results in a unitary, graded interface between the attached components and eliminates the need for applying thermal-cure adhesives to secure the components.

Abstract: Fluid tooling for use in an inductive welding system for creating a fusion bond along a bond line between two thermoplastic parts includes an elongated vessel made of fluid impervious flexible material and having an elongated axis and an open end at each axial end of the vessel, closed and sealed by end closures. A coil is received in the vessel for generating an alternating magnetic field transverse to the longitudinal axis. A linear guide in the vessel extends axially for substantially the full length of the vessel and guides the coil for movement axially through the vessel. Power leads are connected to the coil and extend through a pass-through in one end closure to connect the coil to a source of high frequency electrical power of about 35 KHz to energize the coil to produce an alternating magnetic field.

Abstract: A method of firmly jointing Ti-alloy members of various shapes such as pipes and rods by solid diffusion bonding. The members are butted and heated under pressure in a non-oxidizing atmosphere, while a Ti-layer is disposed at the interface of butting by either (1) inserting a sheet for bonding made of Ti having a thickness of 500 .mu.m or less between the butted faces, or (2) previously forming a Ti-layer for bonding having a thickness of 1 .mu.m or more on at least one of the butted faces by any method such as vapor deposition.

Abstract: A method and apparatus in which edge portions of metal parts, the edge portions being disposed with opposed surfaces, are heated by high frequency electrical currents as the edge portions are advanced and brought together at a weld point. The electrical currents are induced in the edge portions in advance of the weld point by two induction coils, one at one side of the metal parts and the other at the other side of the metal parts, disposed and energized from a high frequency electrical source so that the electrical currents at the opposed surfaces flow in opposite directions at any given time and the currents induced by one coil add to the currents induced by the other coil.

Abstract: A multiple component structural member is made by cold roll forming two continuous strips of metal on opposite sides of a third continuous strip of metal. The cold rolling process creates two hollow flange elements with a continuous aperture in which the edges of the third continuous strip of metal is partly extended, followed by resistance or induction welding to create the multiple component structural member.

Abstract: This invention rapidly and surely joins sheet bars to each other for continuously hot rolling in a high productivity by a combination of a treatment that the front end portion and the back end portion of these sheet bars are contacted and heated at such a contact region by applying alternating magnetic fields so as to pass in a thickness direction of the sheet bar with a treatment of pushing at least one of these sheet bars.

Abstract: A device for inductively heating flat metal objects, with at least one pair of induction coils which form a gap through which the object is moved. The induction coils have an iron core made up of transformer stampings with grooves in which current conductors are arranged. The iron cores of at least one inductor coil have grooves which run in a zig-zag or undulating fashion along the direction of motion of the object being heated. The maximum angle the grooves make with the direction of movement of the object is 60.degree., and the current conductors are disposed in the grooves so as to follow the zig-zags or undulations thereof. The inductor coils of at least one inductor-coil pair include several side-by-side conductors which are arranged so as to carry current in the same direction along the coil. At least some of the current conductors are arranged for selective independent electrical connection to a source of electrical energy.

Abstract: In this invention, a back end portion of a preceding sheet bar and a front end of a succeeding sheet bar are cut in a transfer line at an entrance side of a finish rolling mill so that at least both side edge regions of these sheet bars are contacted with each other at a butted contact state thereof and a gap is formed between both end portions and then portions to be joined int he preceding and succeeding sheet bars are locally heated and pushed to join them while gradually enlarging a joining area, whereby the required time is largely reduced as compared with the conventional technique and also it is attempted to miniaturize the heating apparatus and shorten the length of the apparatus.

Abstract: A method and apparatus for forming thin-wall tubing in a funnel die or with a series of sets of forming rollers. The tubing is then welded by a method and apparatus which includes simultaneous guiding of the both the inner and outer peripheries of the tubing during the welding operation by a mandrel and a sleeve, respectively, so that lack of rigidity of the tubing is not a limitation. The edges of the tubing are not clamped, but are allowed to "float" during welding. The resulting tubing is highly uniform. A wide range of tubing materials can be welded and thin-wall tubing of nearly any desired length or wall thickness can be produced.

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: A method and device for manufacturing thin-walled hollow bodies comprising concentric layers employs, for thin-walled structural parts of chemical installations subjected to stress at high temperatures, non-layered pipes of single-metal materials. Due to the methods of manufacture, structural parts of these materials have disadvantages because the single materials of which they are built cannot simultaneously satisfy the demands of corrosion resistance, high-temperature stability and resistance to scaling. According to the new method, for example, thin-walled pipes of concentric, non-corrosive, high-temperature stable, and non-scaling material layers are intended to be produced. For the non-corrosive inner layer, for example, a conventional thin-walled pipe is used.

Abstract: There is disclosed a method and apparatus for manufacturing a small diameter, thick walled, cable sheath by controllably driving a metal strip in a longitudinal direction while it is trimmed and formed into a hollow tubular member; continuously welding the longitudinal abutting edges of the hollow tubular member in association with cooling the tubular member in the vicinity of the welding by surrounding at least 60% of its circumference with a coolant, while maintaining the resulting longitudinal welded seam free of the coolant; and continuously drawing the cooled hollow tubular member in the same direction as the metal strip is driven.

Abstract: A method for manufacturing thin-walled hollow bodies comprising concentric layers forming thin-walled structural parts of chemical installations subjected to stress at high temperatures, thereby replacing non-layered pipes of single-metal materials. Due to the methods of manufacture, structural parts of these single-metal materials have disadvantages because the single materials of which they are built cannot simultaneously satisfy the demands of corrosion resistance, high-temperature stability and resistance of scaling. According to the new method, for example, thin-walled pipes of concentric, non-corrosive, high-temperature stable, and non-scaling material layers are intended to be produced. For the non-corrosive inner layer, for example, a conventional thin-walled pipe is used.

Abstract: An apparatus for continuous production of seam-welded steel tubing is proposed. The apparatus includes a series of shaping rolls for shaping a strip taken out from a strip coil into a tubular intermediate product, the roll series including a finpass roll group. The tubular product is subjected to seam welding under the action of a seam welder. Before arrival at the welder, a substantial main part of the preformed tubing with exception of opposing edge zones thereof is subjected to heating by a heater compensate for excess compressive stresses induced in the edge zones, while these zones are subjected to cooling by a cooler for avoiding otherwise formation of disadvantageous edge wavings which would otherwise occur.

Abstract: Method for flushing the inside surface of a pipe in the vicinity of a welded seam, where a flushing gas is fed to the pipe with laminar flow, characterized by the feature that the laminar flow in the pipe is transformed into a turbulent flow in front of the welded seam.

Abstract: The service life of torches used for water injection plasma arc cutting and like water cooled devices is increased by treating cooling and injection water of high dissolved solids content so as to lower the dissolved solids content of the water until its Ryznar Stability Index is in the range of about 5.5 to about 7.5.

Abstract: An impeder for use in a mill for roll-forming tubing. The mill includes a feed station for supplying an elongated steel strip in flat form and a station where the strip is transversely bent from its planar condition causing the lateral edges of the strip to be brought together in abutting relationship. An induction coil is positioned about the bent portion of the strip for inducing current flow through the location where the lateral edges first abut to heat the lateral edges to plasticity. The mill also includes a weld rolls station where the plastisized lateral edges are firmly pushed together to complete welding of the tube. The impeder is disposed inside the induction coil adjacent the location where the lateral strip edges are first brought into abutting relationship. The impeder includes an outer shell made of a strong, heat-resistant material, a core disposed inside a shell and formed by an aggregation of ferromagnetic material, and components for causing passage of a coolant through the core material.

Abstract: In an induction welding process for metal tubing, an impeder having a fiberglass sleeve and an exposed ferrite core is used to concentrate the flow of current along a seam to be welded. The sleeve at its upstream end is connected to a brass fitting which couples a source of coolant to the impeder. The sleeve is loosely connected to the ferrite core by a pin and the ferrite core is exposed and protrudes from the downstream end of the sleeve, thereby allowing the ferrite core to be placed in close proximity to the welding point of the metal tubing. As coolant flows over the exposed end of the ferrite core, it both cools and cleans the exposed end of the ferrite core.

Abstract: An improved welding method for welding an inner seam of a longitudinally welded steel pipe along an inner groove by welding electrodes held by a boom which is supported by a tracing roller moving along the inner groove of the steel pipe. According to the invention, at least one metal plate is urged against at least one end of the steel pipe after tack welding the seam on an opposite side of the inner groove of the steel pipe to be welded. Lateral angular deformations of the end of the steel pipe are prevented on both sides of the seam. Such deformations are due to the load of the boom when the tracing roller leaves the end of the steel pipe for the metal plate. Thus, the invention provides for prevention of hot cracking at the end of the pipe.

Abstract: A return-flow type impeder assembly useful in induction welding of small tubing wherein the impeder is movably disposed within an enclosure member so that the force of liquid coolant flowing through the assembly between the impeder and enclosure maintain same in substantially coaxial relationship without the use of mechanical spacers or the like.

Abstract: The apparatus of the present invention is used for holding and cooling a metal tube during welding. The tube has a cylindrical bore of predetermined diameter extending therethrough. The apparatus comprises a cylindrical mandrel having a bore extending axially therethrough. The bore has a central portion of reduced diameter and has outwardly tapering portions at its opposite ends. The mandrel also has a plurality of elongated axially extending slots formed in the walls of the mandrel so as to permit the mandrel to expand radially outwardly. Cam means are positioned within the mandrel bore and are adapted to be moved to cause outward radial expansion of the mandrel. The method of the present invention comprises placing the mandrel within the cylindrical bore of the metal tube, and expanding the mandrel radially outwardly against the inner surface of the metal tube, so as to hold the tube in place and cool it during welding.

Abstract: A confined space welding apparatus which is to interiorly weld a tube to a structure such as a wall of an enlarged chamber. The position of the weld bead is initially determined through a set gage. This set gage is then employed to accurately position the welding electrode within the welding apparatus. The welding apparatus is includes collapsible handles to facilitate insertion of the welding apparatus within the enlarged chamber. The collapsible handles are then moved to their extended operable position and then the welding apparatus is securely clamped within a conduit positioning the welding electrode at the area to be welded.

Abstract: The invention relates to a method and an apparatus to perform plasma welding, by providing a cooling water temperature detector at the inlet side of cooling water in the plasma welding torch, controlling the temperature at the inlet side of the cooling water running into the plasma welding torch at a set temperature of more than 4.degree. C. and less than 18.degree. C., starting a plasma arc when the temperature of the cooling water reaches a specified point after starting to pass the cooling water, and moving the base metals and the torch relatively upon lapse of a specified time allowed to form a keyhole after start of the plasma arc.

Abstract: An improvement in a method for producing a welded metallic can body. The method involves holding and pressing a lap portion of the side marginal portions of a can body-like structure, which has been formed by bending a metal blank into a cylindrical shape, along its entire length between a pair of opposing parallel wire electrodes placed on the opposing surfaces of parallel electrodes, and passing an electric current across the parallel electrodes for a predetermined period of time during the pressing to subject the lap portion to resistance welding. At least one of the parallel electrodes is divided longitudinally into two or more portions electrically insulated from each other, and an electric current is passed through at least one of them independently from the other portions so that the temperature rise in the lap portion of the can body-like structure becomes uniform. Also disclosed is an apparatus for producing a welded metallic can body in accordance with the aforesaid method.

Abstract: An apparatus comprising a case with a carriage mounted on horizontal guides thereof which carriage supports two brackets provided with contact clamps. Under the brackets there is mounted a bath containing a cooling medium. At least one of the brackets is movable and is resiliently pressed in the direction opposite to the second bracket. A rod of a power cylinder is in contact with the movable bracket which rod serves only to put the brackets closer. The contact clamps are provided with mandrels to be inserted into a tubular workpiece.

Abstract: A method and apparatus for welding or brazing of sheetmetal or plate covered with a temperature degradable protective coat, such as zinc or plastic. A cooling saddle supplied with liquid nitrogen is arranged on the side of the plate opposite that adjacent the welding torch. During the formation of the weld, gaseous nitrogen escapes through holes in the saddle to cool the protective coat and keep it from melting or volatilizing.

Abstract: Apparatus for supporting and feeding high frequency electric current to a pair of contacts for engaging a work piece or pieces and supplying current thereto in which a co-axial line has relatively movable inner and outer conductors with a pair of contacts respectively mounted at one end of each conductor, electric current being supplied to the conductors adjacent the other ends of the conductors. In one embodiment, the conductors are rotatable and the contacts are mounted on radially extending arms secured to the ends of the conductors. In other embodiments, one conductor is rotatable and the other conductor is axially movable, one contact being mounted on a radially extending arm secured to the rotatable conductor and the other contact being secured to the end of the axially movable conductor. Also, flexible lead and conductive bearing current feed systems and contact mounting arms which are readily convertible into an induction coil support.

Abstract: A method for cooling a weld in steel piping during butt welding with cooling of the inside comprises, after joining of pipe ends by a root pass on the inside, cooling the junction being welded by subsequent passes with injection of a liquid medium at room temperature from the center of the pipe against the surrounding wall, in a direction between radial and tangential directions relative to the inner pipe surface. An apparatus for practicing the cooling method comprises a rotatable multi-nozzle assembly having a radius of rotation corresponding to the inside diameter of the pipe and is capable of injecting the cooling medium against the inner surface of the pipe, a duct for conducting the cooling medium to the nozzles, and a pumping device for forcing the cooling medium under pressure into the nozzles.

Abstract: A method for butt welding of austenitic stainless steel piping with forced cooling of the inside by the flow of a cooling medium comprises the steps of initially welding the pipe ends together by a root pass prior to the inflow of the cooling medium so as to prevent leakage of the medium to the outside, introducing an insert for constraining the flow of the cooling medium into the pipe, and welding the junction while forcing the medium to flow through the space between the insert and the surrounding wall of the pipe, the insert constructed so that it increases the flow velocity of the cooling medium to the maximum in the vicinity of the welded joint being formed.

Abstract: An arc welding method for manufacture of a welded steel pipe wherein the edges of a steel plate bent into a pipe shape are welded together on one side for forming a pipe and then the seam line of the thus formed pipe is welded by a second welding operation at the side opposite to the side where the first welding was performed. During such second welding, the weld is cooled forcedly from the side where the first welding was performed. Such forced cooling compensates for any physical effects accompanying the welding and imparts elevated toughness to both the weld metal and the heat affected zone.

Abstract: A tube mill which employs circular rotating electrodes for welding the edge seam along with means within the continuous tube for rolling the welded seam. An arm extends into the tube and carriers a rotating roller that contacts the seam just downstream from the point where welding occurs. A connector affixed to the arm extends upward through the region between the converging edges of the strip to a pivot pin. An air cylinder is arranged to rock the arm about the pivot pin and force the roller upward against the undersurface of the hot seam close to the circular welding electrodes to produce a smooth surface. The upper section of the arm carries a pair of rotatable discs of different thicknesses which guide the converging edges of the strip into proper position for welding. The arm carries a pipe which directs fluid past the roller to blow weld spatter downstream while simultaneously cooling the roller.