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Showing papers on "Butt welding published in 1974"


Patent
15 Aug 1974
TL;DR: In this article, a flash-butt welding machine for connecting the ends of strips following one another includes a stationary clamping frame and an upset platen arranged ahead of the clampingframe and movable in the direction of band travel.
Abstract: A flash-butt welding machine for connecting the ends of strips following one another includes a stationary clamping frame and an upset platen arranged ahead of the clamping frame and movable in the direction of band travel. Arrangements are provided for transfer of the bands, for lateral centering of the bands, for gripping the centered bands to hold them stationary, for cutting the bands, for moving the centered and cut bands against each other, for welding the bands together and for removing the weld bulge or flash. On the clamping frame and the upset platen, between the arrangements for transfer of the bands and the gripping devices, a squaring shear for each of the bands is arranged, one of the squaring shears being mounted on the upset platen.

15 citations


Patent
22 Nov 1974
TL;DR: In this article, a method and apparatus for butt welding two surfaces of different polyethylenes by heating the two surfaces up to different temperatures at which the viscosities of the two different polyels of two surfaces are equal was presented.
Abstract: A method and apparatus for butt welding two surfaces of different polyethylenes by heating the two surfaces up to different temperatures at which the viscosities of the two different polyethylenes of the two surfaces are equal. The heating device for heating the polyethylene surfaces comprises two separate plates which can be heated up to different temperatures. The device is also provided with pressure regulating means for controlling the pressure at which the two surfaces are pressed onto each other.

15 citations


Patent
05 Mar 1974
TL;DR: In this article, a thermoplastic foam strip is butt welded employing a tongue and groove joint, where the initial form of the tongue is larger than the groove and the tongue-containing portion is heat formed immediately prior to abutting the elements.
Abstract: Elongate thermoplastic foam strips are butt welded employing a tongue and groove joint wherein the initial form of the tongue is larger than the groove and the tongue-containing portion is heat formed immediately prior to abutting the elements. A stronger butt weld is obtained and optionally the pieces are selfcentering in one plane.

15 citations


Patent
12 Jul 1974
TL;DR: In this article, the working faces of welding thermoplastic materials are profiled in a parallel manner relative to each other so that the joining face (4) facing the cross sectional face (5) of the parts to be welded is increased in area.
Abstract: Heating-welding tool for welding thermoplastic materials, esp. for butt welding, has working faces (2) profiled in a parallel manner relative to each other so that the joining face (4) facing the cross sectional face (5) of the parts (3) to be welded is increased in area. Welded joints with the same strength as the base material are otained.

13 citations


Patent
08 Apr 1974
TL;DR: In this paper, a chain welding machine for the resistance butt welding of interlinked chain links bent into the shape of a C, with a saddle for supporting the link to be welded and, disposed in the same guide plane, two guide supports inclined with respect to the horizontal, to support the unwelded chain links which are interlinked with the chain link which is being welded, with two compression levers pivotable about parallel axes by a control shaft through at least one drive means, and with, guided horizontally in aligned straight guides and coupled to these compression levers, two tool
Abstract: This invention relates to a chain welding machine for the resistance butt welding of interlinked chain links bent into the shape of a C, with a saddle for supporting the link to be welded and, disposed in the same guide plane, two guide supports inclined with respect to the horizontal, to support the unwelded chain links which are interlinked with the chain link which is to be welded, with two compression levers pivotable about parallel axes by a control shaft through at least one drive means, and with, guided horizontally in aligned straight guides and coupled to these compression levers, two tool carriers for compression tools which are to engage on the rounded portions of the chain link which is to be welded, the compression tools moving in opposite directions while the compression levers are being pivoted in opposition to each other.

11 citations


Patent
David Emil Johnson1
01 Feb 1974
TL;DR: In this article, a technique for butt welding a trailing end of one roll of thermoplastic film or sheet material to the leading edge of another roll of such material by vertically superimposing the trailing and leading portions of the two rolls, aligning the lateral edges of such portions over a significant distance sufficient to insure angular alignment at the butt weld is described.
Abstract: Improvement in the process and apparatus of Application Ser. No. 236,766 filed Mar. 21 1971, now U.S. Pat. No. 3,769,124. There is described a technique for butt welding a trailing end of one roll of thermoplastic film or sheet material to the leading edge of another roll of such material by vertically superimposing the trailing and leading portions of the two rolls, aligning the lateral edges of such portions over a significant distance sufficient to insure angular alignment of the two rolls at the butt weld. Severing the two portions along a coincident transverse line, heating the severed portions to an extent sufficient to weld such together, and bringing the heated transverse edges of the two portions together while maintaining lateral edge alignment of said portions, whereby butt welding such into a continuous sheet.

10 citations


Patent
23 Dec 1974
TL;DR: In this paper, a method of butt welding two adjoining plates is described, which includes welding the two plates together in a single pass, cutting a gap in the center of the first weld leaving first weld material on the two adjoining surfaces, and then rewelding the gap between the two adjacent surfaces of first weld materials ensuring the re-weld only occurs on the first welding material.
Abstract: A method of butt welding two adjoining plates is disclosed. The method includes welding the two plates together in a single pass, cutting a gap in the center of the first weld leaving first weld material on the two adjoining surfaces, and then rewelding the gap between the two adjoining surfaces of first weld material ensuring the reweld only occurs on the first weld material. This method has the advantage of heat treating the heat affected zone (HAZ) of the parent material adjacent the weld to prevent adverse metallurgical effect on the metal.

9 citations


Patent
18 Sep 1974
TL;DR: In this article, the cup and the nut are connected by applying pressure and welding current whereby the pressure is applied just prior to, during and shortly after the welding to produce an intimate bond between the nut and cup.
Abstract: The present process is especially suitable for economically producing cup nuts in large quantities by conventionally manufacturing the nuts and by deep drawing the cups separately from sheet metal in a single step to provide the cup with an outwardly facing chamfer along its edge surrounding the open end of the cup. In other words, the chamfer is produced as the result of the deep drawing step. The cup and the nut are connected by applying pressure and welding current whereby the pressure is applied just prior to, during and shortly after the welding to produce an intimate bond between the nut and cup. Due to the chamfer the welding bond forms an inwardly facing butt welding seam preferably running all around the edge of the cup, whereby a machining after the welding is avoided.

9 citations


Patent
17 Jun 1974
TL;DR: In this paper, the paper is a weldable paper and the sheets bond to one another where they are clamped in contact and raised to a welding temperature by heat of one or both of the clamping jaws, radio frequency energy or otherwise.
Abstract: This invention bonds the paper pages of books without applying adhesive to the paper. Clamping jaws press the paper sheets of a book together along the edges that are to be bound. The paper is a weldable paper and the sheets bond to one another where they are clamped in contact and raised to a welding temperature by heat of one or both of the clamping jaws, radio frequency energy or otherwise. The temperature must be at least as high as the welding temperature of the paper and not so high that it will scorch or otherwise damage the paper. The clamping and welding apparatus are combined with other book-making machinery and located along the course followed by the unfinished book at a station where the welding step can be done automatically and with substantial saving in the usual labor required.

9 citations


Patent
15 Apr 1974
TL;DR: A method of and apparatus for welding metal strips in which the strip ends are cleaned, to ensure good welding conditions, prior to being sheared and welded, the three operations taking place in a clamp position.
Abstract: A method of and apparatus for welding metal strips in which the strip ends are cleaned, to ensure good welding conditions, prior to being sheared and welded, the three operations taking place in a clamp position.

8 citations


Patent
06 Sep 1974
TL;DR: In this article, two flexible welding cables carry capacitor discharge current from a capacitor bank in a capacitor charging welding set and produce a movable electrical connection between a welding gun and a base material onto which a welding element is to be welded.
Abstract: In the machine disclosed, two flexible welding cables carry capacitor discharge current from a capacitor bank in a capacitor charging welding set and produce a movable electrical connection between a welding gun and a base material onto which a welding element is to be welded. Both welding cables are fixed with respect to one another. According to one embodiment of the invention the cables are arranged to be equidistant from one another substantially over their entire length. They are arranged as close as possible to each other within the breakdown limits of the insulation. The cables are of a predetermined length.

Patent
15 May 1974
TL;DR: In this article, the electron beam is directed on top of a bar of filler metal so that it melts and fills the gap, which eliminates welding defects (unilateral fusion, arching) which are common in conventional electron beam welding.
Abstract: To join two abutting metal plates by electron beam welding, a bar of a filler metal is laid over a gap at the butt joint. The electron beam is directed on top of this bar so that it melts and fills the gap. The gap is so dimensioned that the molten metal just fills it. The gap can be partly filled up by a filler metal insert or powder prior to welding. A copper backing plate can be used at the other side of the joint. This eliminates welding defects (unilateral fusion, arching) which are common in conventional electron beam welding. A simple electron gun is suitable for this method. The butt joint requires no careful preparation and can be flame cut.

Patent
25 Apr 1974
TL;DR: In this article, the plastics components are pressed very briefly on to a heated element between them, so that their surfaces are melted, then the heating element is withdrawn while the press is maintained.
Abstract: The plastics components are pressed very briefly on to a heated element between them, so that their surfaces are melted, then the heating element is withdrawn while the press. is maintained, so that the two components are pressed and welded together. This results in a much smaller depth of penetration than when the components are retracted before withdrawl of the plate.

Patent
03 Sep 1974
TL;DR: In this paper, an automatic vertical fillet welding was proposed, where the welding torches are automatically directed towards a vertical welding area through unique mechanical and electric controls. But the welding strength was too weak for welding mother plates, having a thickness of 25 mm, since frequently there are disadvantageous lack of fusion of penetration and the welded structures could prove to be defective.
Abstract: The invention relates to an apparatus for automatic fillet welding. The apparatus has a runnable motor-driven carriage which carries a multi-stage telescopic unit which mounts a lateral slide unit mounting in turn a longitudinal slide. A welding head having three welding torches mounted on tip end of the longitudinal slide through a complex type fine adjusting mechanism assembly. The telescopic unit is controlled by a hydraulic pump circuit which is controlled in turn by means of an automatic electric circuit. BACKGROUND OF THE INVENTION This invention relates to a novel apparatus for carrying out automatic vertical, high speed fillet welding. Previously, the automatic vertical fillet welding was generally carried out in an upwardly advancing method without use of any protecting gas. In rare cases, however, the automatic vertical fillet welding was proposed, at least theoretically, relying upon the downwardly advancing method using carbon dioxide gas as a protecting or atmospheric gas. In the part according to our experience, depth of weld was only about several millimeters at the most, thus the welding strength was too weak for welding mother plates, having a thickness of 25 mm for example, since frequently there are disadvantageous lack of fusion of penetration and the welded structures could prove to be defective. A proposal for remedying this problem resides in an upwardly advancing automatic fillet welding process without use of any protecting gas and the welding torch being reciprocated in the lateral directions for providing sufficient weld metal. This proposal has been met, however, with a highly retarded welding speed for even minimum deposition lengths such as 10 millimeters. In order to achieve downward-advancing fillet welding, it has already been proposed to mount a lateral slide unit on a telescopically extendable and retractable unit carried by a runnable or vehicular carriage, and to mount a welding head comprising a plurality of, preferably three, welding torches, on a longitudinal slide unit which is mounted on said lateral slide unit. SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic mechanism for uniformly extending and retracting a telescopic support unit adapted for use on the vertical welding apparatus of the above kind. A further object is to provide a welding apparatus of the above kind, having an improved control mechanism for maintaining a telescopic support at a descending speed of a substantially constant value so that a welding head is adapted for the uniform downwardly effected fillet welding procedures. Still a further object is to provide a welding apparatus of the above kind wherein the welding torches are automatically directed towards a vertical welding area through unique mechanical and electric controls. It is still a further object to provide an automatic downward advancing welding apparatus of the above kind which is provided with such means as keeping the extended telescopic unit in an extended upright position adapted for execution of the subsequent vertical and decending fillet welding job. The invention resides in its broadest sense in means for attaining an automatic, downwardly advancing fillet welding, characterized by a plurality of welding torches arranged at several different heights being caused to move at a constant speed in successive orders, so as to conjointly provide a weld joint during a single pass. These and further objects, features and advantages of the invention will become more apparent as the description proceeds by reference to the accompanying drawings in which:

Patent
28 Nov 1974
TL;DR: In this article, the end of a sheet or strip is moved backwards over a clamp and welding cheeks until it meets the guide-edge in the lower part of flying-shears; it is then centred and a looping device takes up any bow in the strip; a strip support roll then drops so that the strip rests on the lower welding cheek.
Abstract: The end of the strip being rolled is moved backwards over a clamp and welding cheeks until it meets the guide-edge in the lower part of flying-shears; it is then centred and a looping device takes up any bow in the strip; a strip-support roll then drops so that the strip rests on the lower welding cheek. The end of the new coil of sheet or strip is fed in from the other (i.e. the entry) side of the machine and is treated in a similar manner, both ends being in position. Clamps outside the two pairs of welding cheeks clamp the strips and move the two edges slightly away from the guide in the shears, which then cut the edges and move out of the gap between two heads which carry the welding cheeks. When the flying shears have left the gap, one head moves towards the second, stationary head and a flash butt weld is made in the normal way. The strip then moves through a deburring unit and a groove-stamper. The cycle is completely automatic due to using servo-mechanisms etc. which can be operated by electric, mechanical, hydraulic or pneumatic means.

Patent
29 Aug 1974
TL;DR: Welding head support appts. for circumferentially welding butted tubes, including a track for guiding the appts in a substantially circular configuration which is formed of first and second sections, each being hinged at one end and securable at the other ends by a fastener as mentioned in this paper.
Abstract: Welding head support appts. for circumferentially welding butted tubes, comprises (1) a track for guiding the appts. in a substantially circular configuration which is formed of first and second sections, each being hinged at one end and securable at the other ends by a fastener, (2) a guide roller device for guiding the supporting appts. round the tubes, having several separate roller units, at least two of the units being located exteriorly and an opposing lateral sides of the track, and (3) a retention device retaining the guide roller device in connection with the track, the device including a flexible belt surrounding the tubes and in friction contact with the track and passing through a drive roller housing biased away from the guide roller housing.

Patent
05 Jul 1974
TL;DR: In this paper, a cold-butt welding machine for cutting off the ends of metal blanks is described. But the blanks may be in different relationships in space and the machine is provided with guide members carrying blank clamping devices, single-endedly fixed, that is in a cantilever fashion, in a power drive housing installed on a bed of the machine.
Abstract: Machine for cold butt welding of metal blanks, wherein one of the blank clamping devices mounts on its housing a carriage with blades for cutting off the ends of the blanks, adapted for possible displacement in the direction of the force upsetting the blanks to position these blades at such distances from the device housings that assure the upsetting of an amount of metal as needed for the welding. The machine is provided with guide members carrying blank clamping devices, single-endedly fixed, that is in a cantilever fashion, in a power drive housing installed on a bed of the machine and adapted for set turning in at least one vertical plane in relation of the upsetting force. The blanks may be in different relationships in space. The invention can be successfully employed in welding aluminum and copper blanks of any cross-sectional shapes: circular, square, rectangular, rhombic, etc. The present machine is particularly effective in the operations of extending the ends of electric motor windings, in coiling high-capacity power transformers, producing continuous wires, welding multicore cables, etc. The machine assures axial alignment of blanks at their placement in clamping devices and during upsetting, and is also adapted for welding metal blanks having at least one flat surface on their perimeter.

Patent
31 Jan 1974
TL;DR: In this paper, the profile of a window frame is held in position vertically between two motors, of which one drives a milling cutter and the other a polishing tool, and a central cylinder fitted with sensors to control the movement of its ram which in turn operates the two motors.
Abstract: The profile, esp a plastic window frame, is held in position vertically between two motors, of which one drives a milling cutter and the other a polishing tool. Above the frame is a central cylinder fitted with sensors to control the movement of its ram which in turn operates the two motors. The milling cutter first moves on to the butt weld and removes the weld bead. The control device then raises the cutter and swings the polishing tool into position to clean the weld. Finally the device brings the miller back into position for the next operating cycle.

Journal Article
TL;DR: In this article, the main welding parameters to achieve quality control are welding current, welding time and electrode force, and methods for achieving required spot diameters, typical welding ranges and use of destructive testing are described.
Abstract: Features which influence spot weld quality are included. The main welding parameters to achieve quality control are welding current, welding time and electrode force. Methods for achieving required spot diameters, typical welding ranges and use of destructive testing are described.

Patent
25 Apr 1974
TL;DR: In this paper, the cable ends are placed together in a ceramic holder, and one cable end cut at an angle of 95-100 degrees, giving a rapid build-up of welding heat and melting temps.
Abstract: The cable ends are placed together in a ceramic holder, and one cable end cut at an angle of 95-100 degrees. The welding current from the electrodes therefore has a narrowly-defined path, giving a rapid build-up of welding heat and melting temps. for the cable ends to be pushed together. This accelerates butt welding time, improves the melting affect, and ensures that the individual strands are fused together.

Journal Article
TL;DR: A step by step description of electroslag welding and the mechanical equipment employed in the process is given in this article, where tables showing the time saved in welding side shell butt joint and longitudinal stiffeners are shown.
Abstract: A step by step description of electroslag welding and the mechanical equipment employed in the process Included are tables showing the time saved in welding side shell butt joint and longitudinal stiffeners broken down by the time saving achieved in each step of the process

Patent
19 Dec 1974
TL;DR: In this paper, a V-shaped ring is used to weld pipe ends together and the axial force is exerted to press the ring outwards, which produces much less internal flash on the pipes than if the pipes are rotated.
Abstract: Pipes of large dia. for pipelines are butt welded together by rotating a V-shaped ring which fits in the V-gap of the chamfered pipe ends. When the frictional heat has softened the metal near the ends, an axial force is exerted to weld the pipe ends together and the press the ring outwards. The heavy pipes need not be revolved, only the small ring which can be stopped quickly when desired. This method produces much less internal flash on the pipes than if the pipes are rotated.

10 Jul 1974
TL;DR: In this paper, a high temperature electric resistance strain gage system was developed and evaluated to 1366 K (2000 F) for periods of at least one hour, and the effectiveness of a clad-wire concept as a means of minimizing apparent strain of BCL-3 strain gages was investigated.
Abstract: A high temperature electric resistance strain gage system was developed and evaluated to 1366 K (2000 F) for periods of at least one hour. Wire fabricated from a special high temperature strain gage alloy (BCL-3), was used to fabricate the gages. Various joining techniques (NASA butt welding, pulse arc, plasma needle arc, and dc parallel gap welding) were investigated for joining gage filaments to each other, gage filaments to lead-tab ribbons, and lead-tab ribbons to lead wires. The effectiveness of a clad-wire concept as a means of minimizing apparent strain of BCL-3 strain gages was investigated by sputtering platinum coatings of varying thicknesses on wire samples and establishing the optimum coating thickness--in terms of minimum resistivity changes with temperature. Finally, the moisture-proofing effectiveness of barrier coatings subjected to elevated temperatures was studied, and one commercial barrier coating (BLH Barrier H Waterproofing) was evaluated.

Journal ArticleDOI
TL;DR: The high-frequency welding process, based on 450-kcal resistance heating and subsequent forge welding is shown to be a versatile, productive, and highly economical method of producing lightweight structural beams as discussed by the authors.
Abstract: The high-frequency welding process, based on 450-kcal resistance heating and subsequent forge welding is shown to be a versatile, productive, and highly economical method of producing lightweight structural beams. A single high-frequency welding line can produce 4-to 18-in I or H beams with up to ?-in webs and ?-in flanges, in a single pass, from three coiled strips, in ferrous or nonferrous materials at production welding rates of 20 to 150 ft/min depending on high-frequency generator and system size. Beams can be produced interchangeably, in special section shapes, asymmetric or hybrid configurations, as well as ``standard'' sizes in improved form for increased section strength. Discussion includes process principles, metallurgical weld details and test results, production equipment description and capabilities, conversion costs, and significant market areas for high-frequency welded shapes.

Patent
17 Oct 1974
TL;DR: In this paper, a plastic sheet is stretched in a cutting device so that the cutting line on the edges is placed exactly perpendicular to the longitudinal axis of the sheet, and the sections in a transportable multi-component welding device are extended so that a small split temains between their edges.
Abstract: Butt welding of plastic sheet sections for use as expansion joints, esp. in prefabricates, is effected by a () stretching the single sections in a cutting device so that their edges extend to a slight degree from the clamping jaw opening, at the cutting line on the edges is placed exactly perpendicular to the longitudinal axis of the sheet, (b) extending the sections in a transportable multi-component welding device so that a small split temains between their edges, (c) introducing heated welding rods into the entire length of the splits, and (d) mechanically pressing the sections together after the removal of the rods. Gives exactly aligned seams without manual work.

Patent
25 Apr 1974
TL;DR: An automatic welding machine for chain links preformed to a strand of C-links is fitted with stationary upsetting jaws which act as abutment for an upsetting jaw on a movable upsetting slide as discussed by the authors.
Abstract: An automatic welding machine for chain links preformed to a strand of C-links is fitted with stationary upsetting jaws which act as abutment for an upsetting jaw on a movable upsetting slide. The electrodes are arranged on separate slides. After completion of the butt weld, the chain is deflected by a feed slide to a deburring station where a cutter blade removes the welding flash.