Showing papers on "Butt welding published in 1984"
Patent•
20 Dec 1984
TL;DR: A rotating welding fixture for holding a pipe fitting against a welding table so that socket welds can be fabricated in one continuous operation is described in this article, where a locking dowel is passed into an opening in the fitting and the fitting is locked between the table top and the dowel so that the entire weld region is fully exposed to the welding rod.
Abstract: A rotating welding fixture for holding a pipe fitting against a welding table so that socket welds can be fabricated in one continuous operation. A locking dowel is passed into an opening in the fitting and the fitting locked between the table top and the dowel so that the entire weld region is fully exposed to the welding rod. The table is rotatably supported in a base so that the work can be turned past the welding rod to complete the weld without having to break the weld bead.
48 citations
TL;DR: In this article, a model law for matching is derived from this and illustrated with an example, and a theoretically derived joining displacement equation is shown for the connection process, where the influence of temperature and pressure on joining displacement is estimated.
15 citations
Patent•
08 Nov 1984
TL;DR: In this article, a welding apparatus for fabricating wire grids for concrete reinforcement purposes, in which the longitudinal and cross wires are welded at the intersections, was described, and each electrode pair, consisting of top and bottom electrode (20, 23), forms together with a welding transformer (15) and if need be a longitudinalwire feed mechanism (18) a unit movable individually on a rail (4).
Abstract: The invention relates to a welding apparatus for fabricating wire grids for concrete reinforcement purposes, in which the longitudinal and cross wires are welded at the intersections. Each electrode pair, consisting of top and bottom electrode (20, 23), forms together with a welding transformer (15) and if need be a longitudinal-wire feed mechanism (18) a unit movable individually on a rail (4). All welding units (31-42) can be coupled to a transport spindle (8) by a transport nut (29b) in order to be moved on the rail (4) for a desired amount of travel. The individual mobility of the individual welding units (31-42) permits an infinitely variable and quick adjustment of the longitudinal-wire spacing.
14 citations
Patent•
19 Nov 1984
TL;DR: In this article, a process for checking the welding time of an electrically weldable joint with two tubes (2, 2') to be assembled, characterized in that it consists of sensing the variations of one property of the material to be welded, in such a way that at the instant when welding is completed, the value of this property is used as information supplied by the sensor for controlling the interruption of the welding current.
Abstract: 1. Process for checking the welding time of an electrically weldable joint with two tubes (2, 2') to be assembled, characterized in that it consists of sensing the variations of one property of the material to be welded, in such a way that at the instant when welding is completed, the value of this property is used as information supplied by the sensor for controlling the interruption of the welding current.
12 citations
01 Jan 1984
TL;DR: In this article, the authors studied the change in gap width and the risk for hot cracking in butt-welding of tack welded plates and concluded that the most important welding parameters are the welding speed, the arc energy per unit length of the weld and the number of tackwelds for a given length of a weld.
Abstract: Submerged-arc welding is studied with special attention to hot cracking and to change in gap width in butt-welding of tack-welded plates. The most important welding parameters are the welding speed, the arc energy per unit length of the weld and the number of tack-welds for a given length of the weld. Eight cases are analyzed using the finite element method. The change in gap width and the risk for hot cracking are studied for two different values of each of these welding parameters. It is concluded that it is possible to find a practical combination of welding parameters that minimizes the change in gap width. The welding speed in that combination should be fairly high. The location of the maximum value of calculated change in mechanical strain across the weld, , agrees well with available experimental observations of the location of that crack front which is closest to the edge in the end portion of butt-welded plates. The transverse stresses become compressive at the edge and tensile at a short distance (about 0.1 m) from the edge shortly (about 30 s) after removal of the heat source. Therefore it is believed that the hot cracks nucleate at temperatures around 1200°C due to high transverse strains and then propagate towards the interior of the plate due to the transverse tensile and compressive stresses. It is then concluded that the highest risk for hot cracking is to be found at the end portion of the butt-welded plate for low welding speeds and large values of the arc energy per unit length of the weld.
10 citations
Journal Article•
TL;DR: In this article, an ultrasonic butt welding of metal plates is proposed and studied using 6 mm and 10 mm aluminum plates, which are driven transversally and successfully welded end to end of the plates.
Abstract: Ultrasonic butt welding of metal plates is proposed and studied. The welding specimens used are 6 mm and 10 mm thick aluminum plates. The specimens are driven transversally and successfully welded end to end of the plates. The ultrasonic vibration systems used consist of an upper 27 kHz driving vibration system with 6 bolt-clamped Langevin type PZT transducers and a lower 27 kHz passive vibration system. The upper vibration system is driven by a 3 kW power amplifier. Weld strength per unit area obtained is over 9 kgf/mm2 (88 MPa) which is nearly equal to specimen strength.
10 citations
TL;DR: In this article, an ultrasonic butt welding of metal plates is proposed and studied using 6 mm and 10 mm aluminum plates, which are driven transversally and successfully welded end to end of the plates.
Abstract: Ultrasonic butt welding of metal plates is proposed and studied. The welding specimens used are 6 mm and 10 mm thick aluminum plates. The specimens are driven transversally and successfully welded end to end of the plates. The ultrasonic vibration systems used consist of an upper 27 kHz driving vibration system with 6 bolt-clamped Langevin type PZT transducers and a lower 27 kHz passive vibration system. The upper vibration system is driven by a 3 kW power amplifier. Weld strength per unit area obtained is over 9 kgf/mm2 (88 MPa) which is nearly equal to specimen strength.
8 citations
Patent•
27 Mar 1984
TL;DR: In this paper, an electrical welding fitting for pipes consisting of thermoplastic and/or weldable material, especially polyethylene, having a heating wire to whose ends (12) current can be supplied via a contact element, for welding is described.
Abstract: The invention relates to an electrical welding fitting (1) or welding collar for pipes consisting of thermoplastic and/or weldable material, especially polyethylene, having a heating wire (3) to whose ends (12) current can be supplied via a contact element, for welding. It is intended to achieve an improvement, at a low cost, to the effect that high intrinsic stiffness is provided during welding, there being intended to be a large contact area from the point of view of a low contact resistance. As the solution, it is proposed that the end (12) of the heating wire (3) be wound to form a stiff connecting helix (11) which is arranged in a chamber (8), it being possible to push the contact element (23) into the connecting helix (11).
8 citations
Patent•
29 Feb 1984
TL;DR: In this article, the use of the known process of laser beam welding for the mass production of shells to be welded of metal cans is described, and the high requirements made of the accuracy of the weld are met by virtue of an accurate feed system for the welding machine comprising an X rail, a guide bar and resiliently mounted jaws of a caterpillar train.
Abstract: The invention discloses the use of the known process of laser beam welding for the mass production of shells to be welded of metal cans. The high requirements made of the accuracy of the weld are met by virtue of an accurate feed system for the welding machine comprising an X rail, a guide bar and resiliently mounted jaws of a caterpillar train. Any remaining inaccuracies are rendered innocuous by the fact that welding is carried out from both sides of the can shell and that less than the total thickness of the sheet is joined together by each weld.
8 citations
06 Feb 1984
TL;DR: In this paper, the rapid pre-processor was adapted to perform real-time seam tracking of multipass butt weld and other adaptive welding functions on the Space Shuttle arm 1 by using a projected laser target formed by a line and dots.
Abstract: The rapid pre-processor initially developed by NRCC and Leigh Instruments Inc. as part of the visual aid system of the space shuttle arm 1 has been adapted to perform real time seam tracking of multipass butt weld and other adaptive welding functions. The weld preparation profile is first enhanced by a projected laser target formed by a line and dots. A standard TV camera is used to observe the target image at an angle. Displacement and distorsion of the target image on a monitor are simple functions of the preparation surface distance and shape respectively. Using the video signal, the pre-processor computes in real time the area and first moments of the white level figure contained within four independent rectangular windows in the field of view of the camera. The shape, size, and position of each window can be changed dynamically for each successive image at the standard 30 images/sec rate, in order to track some target image singularities. Visual sensing and welding are done simultaneously. As an example, it is shown that thin sheet metal welding can be automated using a single window for seam tracking, gap width measurement and torch height estimation. Using a second window, measurement of sheet misalignment and their orientation in space were also achieved. The system can be used at welding speed of up to 1 m/min. Simplicity, speed and effectiveness are the main advantages of this system.© (1984) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
8 citations
Patent•
13 Jun 1984
TL;DR: In this paper, a butt weld is made between components having scarves, where three work stations AB, CD and EF advance from right to left, all in a non-oxidising atmosphere.
Abstract: A butt weld is made between components having scarves. Three work stations AB, CD and EF advance from right to left, all in a non-oxidising atmosphere. AB, a plasma scarf melting step, precedes and is overlapped by CD, a spray deposition step, which applied a molten spray of filler metal to form the weld. THe step CD precedes and is overlapped by EF, a peening step, which consolidates the weld as it freezes. The peening EF does not overlap the scarf melting AB.
TL;DR: In this article, the effects of residual stress on both the total and creep strain accumulations for the two weld properties were discussed using the Kachanov model and the results of the finite element analysis are compared with the experimental creep strain data from the pressure vessel testing programme.
Patent•
25 Sep 1984
TL;DR: In this article, the bottom end plate of a pressure vessel for a nuclear reactor is subjected to seat build-up welding 4-1 then to stress relief annealing, and a stub tube 3 is attached to the vessel by butt welding 4 -2 and in succession, the bottom- end plate and body part of the vessel 1 are subjected to circumferential joint welding and a heat treatment.
Abstract: PURPOSE:To eliminate the sensitivity to stress corrosion cracking of a weld zone without post annealing and to improve reliability by subjecting the stub tube in a pressure vessel for a nuclear reactor to residual stress relief annealing then to build-up welding with ''Inconel'' 82. CONSTITUTION:The bottom end plate of a pressure vessel 1 for a nuclear reactor is subjected to seat build-up welding 4-1 then to stress relief annealing. A stub tube 3 is attached thereto by butt welding 4-2 and in succession, the bottom end plate and body part of the vessel 1 are subjected to circumferential joint welding and a heat treatment. ''Inconel'' 82 is build-up welded 7 on the weld zones 4-1, 4-2 of the vessel 1 and the tube 3 so as to cover said zones. The ''Inconel'' alloy is composed of =67.0% Ni, <=0.12% Co, <=0.75% Ti, 18- 22% Cr, 2.0-3.8% Cb+Ta (Ta is <=0.30) and <=0.50% the total of other elements. No annealing treatment is performed after the build-up welding.
Patent•
03 Mar 1984
TL;DR: In this article, the root pass penetration welding without the slip-off of a backing material is accomplished without applying the arc 6 directly to the material 3, since a root gap (d), and the gap of dislocation, etc. are filled.
Abstract: PURPOSE:To subject pipe bodies to TIG welding in a large permissible error range in groove assembly by performing welding of the root layer in the TIG welding of the single U-groove of the pipe bodies while moving an electrode from above to below along the annular groove part and performing the welding of the 2nd and succeeding layers conversely from below to above while moving the electrode. CONSTITUTION:An electrode 5 is moved from the top to bottom end in an annular groove part 1 by a downward welding method in an arrow direction so that the melt flow 7 of molten metal is made to flow downward always in precedence to an arc 6. Since a root gap (d), and the gap of dislocation, etc. are filled, the stable root pass penetration welding without the slip-off of a backing material 3 is accomplished without applying the arc 6 directly to the material 3. Multilayer build-up welding is accomplished for the welding from the 2nd layer up to the final pass by moving the electrode 5 from below to above in accordance with a conventional method. As a result, the permissible range for the accuracy of the groove assembly in the circumferential butt welding in automatic one-side TIG welding of thick-walled and large-diameter stationary pipe bodies 2, 2 held in a horizontal or inclined position is made wider as compared to the conventional method and the working efficiency and the quality of the welded joint are improved.
Patent•
13 Apr 1984
TL;DR: In this paper, a welding wire is installed on the weld line of a butt part and the upper and lower parts are shielded by semispherical cavities, and the laser beam is first irradiated with low power on the above-described weld line to weld the wire, then the normal welding is executed with high power.
Abstract: PURPOSE:To stabilize seam welding and to improve the efficiency thereby by installing a welding wire to a butt part, irradiating a laser beam on the weld line shielded by semispherical cavities under prescribed conditions and maintaining nearly ''1'' effective absorptivity. CONSTITUTION:The welding wire 3 is installed on the weld line of a butt part 2 and the upper and lower parts are shielded by semispherical cavities 4, 4'. The laser beam is first irradiated with low power on the above-described weld line to weld the wire 3, then the normal welding is executed with high power. The energy reflected and radiated from the weld point is converged on the weld point by multiple reflections on the inside surfaces of the cavities 4, 4'. The seam welding is thus stabilized and the efficiency thereof is improved.
Patent•
[...]
12 Apr 1984
TL;DR: In this paper, a plate material having the thickness roughly equal to the diameter of a fine wire material having high strength is provided apart from the wire at about 1/2 of the plate thickness.
Abstract: PURPOSE:To decrease the thermal influence on a fine wire having high strength and the stress concentration in the end part of welding in laser butt welding of the fine wire and an equal thickness plate by irradiating a laser to the end part of the plate material apart slightly from the fine wire and welding both materials with the power increased at the beginning and end points CONSTITUTION:A plate material having the thickness roughly equal to the diameter of a fine wire material having high strength is provided apart from the wire at about 1/2 of the plate thickness The laser light for irradiating both surfaces by a mirror and a half mirror is moved to irradiate the end part of the plate material, thereby melting the end part and welding the same to the fine wire The power of the irradiation at a beginning point 8a and an end point 8d is increased in this state The weld zone having substantial curvature is thus obtd in the end part 16 of welding and a local stress concentration is eliminated The laser weld zone having high weld strength is thus obtd
Patent•
[...]
07 Dec 1984
TL;DR: In this paper, a cooling pipe and the condensation part are joined via junction welded to both ends of the cooling pipe, and the welding of this weld 20 is a step before junction of cooling fins 8 to the pipe 7.
Abstract: PURPOSE:To unnecessitate the coating of a condensation part by contriving the simplification and security of bonding work, by a method wherein a cooling pipe and the condensation part are joined via junction welded to both ends of the cooling pipe and made of the same kind of metal as that of the condensation part. CONSTITUTION:A coolant changed in phase by a heat generator turns to ebullition vapor, which is put in a vapor phase chamber. The ebullition vapor filling it dissipates heat while passing through a cooling pipe 7 and changes from ebullition vapor to liquid, and this circulation sets the device in normal action. A hetero-metallic weld 20 between the cooling pipe 7 and a joint pipe 18 is located at both ends of that pipe 7, and the welding of this weld 20 is a step before junction of cooling fins 8 to the pipe 7. Therefore, element welding is enabled; tip-opening butt weld is high in reliability, and its workability improves. Besides, the cooling pipe 7 is welded to a mirror plate 14 via the joint pipe 18 of the same kind of metal as that of the mirror plate 14; accordingly, it is possible to use a metallic plate advantageous in the characteristic of the coolant as the material of the mirror plate 14 of the condensation part 11.
Patent•
25 Sep 1984
TL;DR: In this article, a cylindrical annular member (pillow ring) is fitted to the rear of one welding base material in a groove part and is fixed by welding, etc in the case of subjecting pipe bodies 10, 10 such as thick walled steel pipes or the like to one side butt welding.
Abstract: PURPOSE:To enable welding in a large range of the permissible error in the irregularity of a groove in the stage of subjecting thick steel materials such as steel penstocks or the like by fitting a cylindrical annular body having a specific structure on the rear surface in the beveled part of one pipe body and welding the steel materials CONSTITUTION:A cylindrical annular member (pillow ring) 9 having 45-75 deg tip angle theta, >=6mm thickness (d) and >=3mm length (l) is fitted to the rear of one welding base material 10 in a groove part and is fixed by welding, etc in the case of subjecting pipe bodies 10, 10 such as thick walled steel pipes or the like to one side butt welding The ring 9 is an annular steel body of which the inside diameter is roughly equal to the outside diameter of the body 10 and the top end has an inclined surface 11 at a tip angle theta Said ring is attached to the outside at the tip of the one body 10 so as to extend a beveled surface 5 The groove part having such structure is welded from the one side, by which the butt welding of the steel pipes is easily accomplished on the construction site for the steel pipes even if there are dislocation and irregularity in the groove part
TL;DR: In this article, the results of an experimental study on the fatigue behavior of transverse welded steel butt joints containing slag inclusion discontinuities were presented, and the onset of fatigue crack initiation was estimated by monitoring strain gages on the weld surface near the entrapped slag and by examining records of the ultrasonic signal from the slag inclusions.
Abstract: The results of an experimental study on the fatigue behavior of transverse welded steel butt joints containing slag inclusion discontinuities are presented. Twenty‐four constant amplitude zero‐to‐tension fatigue tests were conducted. The 5 in. (127 mm) wide by 1 in. (25 mm) thick quenched and tempered steel specimens were manually welded using the shielded metal arc process. The size, shape, location, and number of slag inclusions entrapped in the welds were varied to examine the relative importance of these factors on the fatigue behavior. The onset of fatigue crack initiation was estimated by monitoring strain gages on the weld surface near the entrapped slag and by examining records of the ultrasonic signal from the slag inclusions. The test results indicate that: (1) Approximately one‐fourth of the total fatgue life was spent in initiating a fatigue crack, and that nearly 55% of the fatigue life was required for propagation of a crack to the weld surface; (2) a number of fatigue cracks initiated at sm...
Patent•
07 Jul 1984
TL;DR: In this paper, the rear end of a preceding strip S1 is positioned and clamped by means of welding electrodes 51, 52 and auxiliary clamps 55, 56, and the front end of S2 is clamped and welded under pressure by a flash trimmer device 129.
Abstract: PURPOSE:To obtain a butt weld zone having high reliability at a high speed by positioning, cutting and welding both ends of preceding and succeeding strips, and cutting off the excess metal in the same position. CONSTITUTION:The rear end of a preceding strip S1 is positioned and is clamped by means of welding electrodes 51, 52 and auxiliary clamps 55, 56. The front end of a succeeding strip S2 is clamped by means of welding electrodes 17, 18, and auxiliary clamps 23, 24. The centers in the transverse directions of both strips S1, S2 are matched, and the rear and front ends of the strips S1, S2 are cut by a shearing device 109. The strip S2 is moved to the rear end side of the strip S1, and both strips are joined by welding under pressure. A flash trimmer device 129 is then fed into a welding device and the excess metal is cut off. The welded strip is fed as a preceding strip to the succeeding stage side.
Patent•
13 Jan 1984
TL;DR: In this paper, an inert gas atmosphere was generated in the region of the welding point of the two parts to be welded to one another, and this was achieved in an advantageous embodiment of the friction-welding machine according to the invention.
Abstract: In the friction-welding of parts having an exact angular position after the welding, difficulties arise when parts having cross-sections which are not rotationally symmetrical and which do not permanently overlap during rotation in the friction process are to be connected to one another. In order to achieve a perfect welded joint, the invention proposes that, during the friction process, an inert-gas atmosphere be generated in the region of the welding point of the two parts to be welded to one another. In an advantageous embodiment of the friction-welding machine according to the invention, this is achieved in that the welding point is surrounded, during the friction process, by two half-shells, between which an inert gas is introduced.
Patent•
06 Jan 1984
TL;DR: In this article, the Butt condition of the cut end faces of the strips was detected from the pressure during welding, and the contact pressure was controlled automatically according to the thickness of the strip.
Abstract: PURPOSE:To subject the cut end faces of strips to be welded to butt welding over the entire length thereof in a sure state, by detecting the butt condition of the strips from the pressure during welding of the cut end faces and controlling automatically the contact pressure thereof according to the thickness of the strips. CONSTITUTION:The end of a preceding strip S1 moving in an arrow direction and the top of a succeeding strip S2 are clamped respectively with the upper and lower clamps 2a, 2b and 3a, 3b of clamping devices 2, 3 on a stationary side and a moving side. A cutter 1 is advanced into between the devices 2 and 3 and is stopped on the line, then the end parts of the strips S1, S2 are cut by the lower blade 6 and upper blade 5 of the device 7. The device 3 is advanced with a cylinder 11, and the device 3 is stopped apart at a certain spacing (e). A backing strip 35 is then moved upward to sandwich the cut end parts from the bottom side of the clamps 2a, 2b, whereafter the device 3 is again advanced. Stopper devices 14, 15 contact with stopper devices 12, 13 on a stationary side, and the pressure exerted on the device 2 on their contacting is detected 17, 18 respectively, and both values are compared, whereby whether the butt condition of the cut end faces in the transverse direction of the strips is adequate or inadequate is discriminated.
Patent•
[...]
14 Aug 1984
TL;DR: In this article, a simple device was used to guide a laser beam using a magnetic sensor to search a butt part with a preceding magnetic sensor and guiding the spot part with prescribed time lag.
Abstract: PURPOSE:To perform correct guide with a simple device in butt welding using a laser beam by searching a butt part with a preceding magnetic sensor and guiding the spot part with a prescribed time lag CONSTITUTION:A magnetic sensor 28 preceding to a laser spot 18 in a butt weld zone is excited by a coil 50 and a difference DELTAV in electromotive force is detected by a coil 52 The difference DELTAV changes abruptly when a joint part B deviates from the center The DELTAV is amplified with an amplifier 70 and the difference in the progression time corresponding to the distance l from a spot part 18 is corrected with a delay circuit 72 A control signal SC is then formed in an arithmetic circuit 74 and a motor 42 is driven by said signal in a servocontrol driving circuit 76 to move a mirror 38, thereby guiding the beam to the joint part A magnetic sensor 30 provided backward in the progression is used to search the welding condition The beam is correctly guided by adding the simple device
Patent•
20 Apr 1984
TL;DR: In this paper, a photoelectric photodetector was used to detect the radiant light emitted from the weld zone in the 1st layer heated by the arc of the 2nd layer.
Abstract: PURPOSE:To form a bead having no defect such as lack of penetration or the like by detecting the quantity of the light radiated from the weld zone in the 1st layer while welding the groove of butted pipes under weaving without feeding a wire in the stage of welding the 2nd layer in the groove thereby controlling the welding of the 2nd layer so that the detected quantity of light attains the set quantity of light. CONSTITUTION:The groove 2 of butted welding pipes 1, 1' is welded at the root pass by ordinary TIG welding. The 2nd layer is welded while a nonconsumable electrode 5 is weaved without feeding a wire 7. The radiant light emitted from the weld zone in the 1st layer heated by the arc of the 2nd layer is detected with a photoelectric photodetector 22 provided to a backing strip 10. At least one among welding current value, welding speed and the number of weaving of the electrode 5 are controlled during welding so that the quantity of the radiant light attains a preset reference quantity of light.
TL;DR: In this paper, the effect of diffusible hydrogen on mechanical properties of underwater wet welded joints by gravity welding process is investigated, where the 4 and 6 mm dia. coated electrodes of five types and SM41 steel base metals of 6 and 9 mm in thickness are used.
Abstract: The effect of diffusible hydrogen on mechanical properties of underwater wet welded joints by gravity welding process is investigated. The 4 and 6 mm dia. coated electrodes of five types and SM41 steel base metals of 6 and 9 mm in thickness are used.Main results obtained are summarized as follows;(1) The volume of diffusible hydrogen in underwater weld is much more than that in air weld. HD of underwater weld.increases with increasing of weld heat input and welding current and with an decreasing of thickness of base metal. However, HW shows roughly a constant value regardless of welding current and thickness of base metal.(2) The mechanical properties of the underwater weld, that is, tensile strength, elongation, bending ductility and notch toughness, can be improved remarkably by post weld heat treatment.(3) The evolution process of hydrogen from bead and butt weld and the recovery process of the mechanical properties of welds are able to be analysed by using the one-dimensional weld model. Consequently it becomes clear that the time factor r=Dt/l02, by which the great part of diffusible hydrogen diffuses out of weld, should be selected as the condition of post weld heat treatment.
Patent•
27 Dec 1984
TL;DR: In this paper, a titled welding jig which prevents generation of a gap in the butt surfaces of pipes by projecting a part of the circumferential walls of segmental arc members fitted into clamp bodies to the axial center side of the bodies and forming windows for welding is presented.
Abstract: PURPOSE:To provide a titled welding jig which prevents generation of a gap in the butt surfaces of pipes by projecting a part of the circumferential walls of segmental arc members fitted into clamp bodies to the axial center side of the bodies and forming windows for welding to the projecting circumferential walls thereof. CONSTITUTION:A cast iron cylindrical body 1 is formed of an inside circumferential surface 1A and two arc-form members 1B which contact with pipes P1, P2 to be welded by sandwiching the butt surface A thereof. Such body 1 is pivotally fitted freely oscillatably, openably and closably via a shaft 4 to bisected semitoric clamp bodies 2A and is made externally fixable and removable to and from the pipes P1, P2 by means of an oscillating lever 5, a gate-shaped latch 6, an engaging bolt 7, etc. The respective members 1B are fitted into the bodies 2A while the circumferential wall parts 1C of said members are projected to one side in the axial center direction of the bodies 2A. Plural windows for tack welding are provided to said parts 1C and are used for matching the tungsten electrode 11 of a torch 10 with the butt surface A.
01 Jan 1984
TL;DR: In this paper, an ultrasonic butt welding method was proposed to join metal specimens end-to-end with a weld strength per unit area of 90 MPa which is nearly equal to specimen strength.
Abstract: Ultrasonic butt welding to join metal specimens end to end is proposed a nd studied. The author has proposed a ultrasonic spot welding with two vibration systems and this method is shown very effective for joining of thick metal plates and it becomes possible to weld about 10 mm thick aluminum plates successfully which was impossible to join by convensional ultrasonic spot welding method with one vibration system. But in the case where aluminum thickness increases over 8 mm, ultrasonic s pot welding becomes very difficult. Ultrasonic butt welding to join specimens end to end is therefore more effective than spot welding for specimens of larger thickness. Aluminum specimen plates of 10 mm thickness were successfully welded end to end with a weld strength per unit area of 90 MPa which is nearly equal to specimen strength. Also, 6 m thick aluminum and copper plates were welded successfully. The ultrasonic butt welding system was shown to be very effective to weld thick metal plates.
Patent•
24 Jan 1984
TL;DR: In this article, the authors proposed a method to prevent the generation of intercrystalline corrosion and stress corrosion cracking in welding base metal in the stage of welding austenitic stainless steel members, by subjecting a welding groove to a buttering treatment then to an overaging treatment and welding the members.
Abstract: PURPOSE:To prevent the generation of intercrystalline corrosion and intercrystalline type stress corrosion cracking in welding base metal in the stage of welding austenitic stainless steel members, by subjecting a welding groove to a buttering treatment then to an overaging treatment and welding the members. CONSTITUTION:Austenitic stainless steels having sensitivity to intercrystalline corrosion and intercrystalline type stress corrosion cracking are overlaid with beads by a buttering treatment in the positions corresponding to the weld heat affected zone in the weld zone and are then subjected to an overaging treatment for 216hr at 745 deg.C in the stage of butt welding said steels to each other. The buttered groove part is subjected to forming to permit welding easy, whereafter the groove is welded by main welding. The weld heat affected zone having high sensitivity to intercrystalline corrosion and intercrystalline type stress corrosion cracking is subjected to a bead coating treatment by buttering and an overaging treatment after welding to decrease the sensitization of the above-mentioned sensitivity that the base metal in the weld zone possess, and the generation of intercrystalline corrosion and cracking is thus prevented.
Patent•
08 Sep 1984
TL;DR: In this paper, a laser beam penetrated through a weld zone diverges and strikes against the inside wall of an evacuating duct 9 and the energy thereof is mostly absorbed by inside wall Air flows from a suction port toward the other end in the duct 9, and cooling fins 10 function to improve cooling effect thereof.
Abstract: PURPOSE:To collect spatters by evacuation and to permit safe and easy maintenance in the case of performing butt welding with a laser beam by providing an evacuating duct on the rear side of a weld zone CONSTITUTION:A laser beam penetrated through a weld zone diverges and strikes against the inside wall of an evacuating duct 9 and the energy thereof is mostly absorbed by the inside wall Air flows from a suction port toward the other end in the duct 9, and the energy absorbed in the duct 9 is cooled by said air flow Cooling fins 10 function to improve the cooling effect thereof The spatters and fumes generated during welding are sucked into the duct 9 and are collected and removed by a dust catcher
Patent•
27 Jan 1984
TL;DR: In this paper, a titled system which enables the full automation of welding and improves the reliability of welding effect by building up overall and precisely the procedure sequence in automatic control for the speed of rotating pipe with a welding device for pipes, welding conditions, the release of cooling water, etc.
Abstract: PURPOSE:To provide a titled system which enables the full automation of welding and improves the reliability of welding effect by building up overall and precisely the procedure sequence in automatic control for the speed of rotating pipe with a welding device for pipes, welding conditions, the release of cooling water, etc. CONSTITUTION:The butt welding of revolving pipes 1 is accomplished by an automatic welding device provided with a control mechanism for a rotating device 5 provided with chucks 6 supporting the pipes 1 to be welded, a control device 7 for the arc length of a TIG welding torch 2, a control mechanism for an oscillation device 8 movable vertically and laterally, a welding control mechanism for the arc voltage and arc current of a welding power source 9, the feed speed for the wire 3 of a wire feeder 4, etc. and a control mechanism for water release device 10 for cooling weld zones. The welding is accomplished in accordance with the preset precision timing chart for each of welding layers relating to the conditions for the rotating speed of the pipes 1, welding conditions, oscillating conditions, conditions for release flow of water, etc.