Showing papers on "Butt welding published in 1999"

Simulation of multipass welding of a thick plate

Abstract: Multipass butt welding of a very thick steel plate has been performed. Transient temperatures and residual stresses have been measured. The agreement between calculations and experiments is good. T ...

Welding system and method

Abstract: A welding system (10) which allows a single welding operator to perform quick, easy and high quality vertical welds comprises a welding fixture (12) with a pair of opposing, positionally adjustable welding shoes, and lock screws for attaching to a workpiece (56) such as an I-beam. Welding fixture (12) is located adjacent the end of an articulating boom (20), and includes a welding torch (14) and oscillator (48). A rotary straight wire feeder (18) removes the cant and helix from welding wire as it is fed to the welding torch (14). The welding torch (14) prevents welding wire from fusing to a guide tube. A distributed welding control system comprising a plurality of controller modules (46, 48, 50, and 52) is interfaced with a common bus (54) and allows a welding operator to program automated welding cycles for various welding operations. The welding system (10) is particularly useful for installing stiffener plates (58) onto structural beams (56).

Method of solid state welding and welded parts

Abstract: A method of solid state welding for joining metal parts having opposed planar and parallel surfaces which includes quickly heating the opposed surfaces of the metal parts with a high frequency induction heater to the hot working temperature of the metal parts in a non-oxidizing atmosphere, continuously moving at least one of the parts relative to the other part generally parallel to the parallel surfaces of the parts, and quickly bringing the opposed surfaces of the parts together with an axial force approximately equal to the conventional friction welding forging force while continuing the relative motion of the parts until the absorbed kinetic energy is approximately equal to ten percent of the energy input required by conventional friction welding The resultant weld is of a quality equal to or greater than normal friction welding but has a much smaller volume of flash and requires significantly less kinetic energy than conventional friction welding and is performed at rotational velocities well below the normal critical surface velocity of friction welding The welded metal part includes a generally planar flash extending radially from the inner section of the opposed planar welded surfaces having a volume corresponding to a combined loss of length of less than 02 axial inches per inch of wall thickness Thus, the disclosed solid state welding method is substantially more efficient than prior friction or other welding methods and results in an improved product

Apparatus and control system for laser welding

Abstract: In general, the present invention pertains to an apparatus and control system for working sheet material employs a tilting mechanism which automatically tilts a head about a theoretical point disposed upon the sheet material. In another aspect of the present invention, the head is defined as a laser head and the pivot point corresponds with the laser beam focal point. A further aspect of the present invention provides a seam tracking device and control system which automatically adjust a welding head height relative to the sheet material as a datum rather than relative to a gantry or other structure supporting the welding head. In yet another aspect of the present invention, an optical seam tracking device is employed to automatically tilt the welding head along differing rotational planes. In still another aspect of the present invention, various axial slides are employed in combination with a gantry. A further aspect of the present invention uses a seam tracking device and microprocessor to track a welding seam and move a welding head predetermined amounts due to sensed pre-weld gap widths. Another aspect of the present invention uses an automated tilting mechanism for creating a tailored blank butt weld between dissimilar materials. A method of operating the present invention is also provided.

Butt welding optical fiber preforms with a plasma torch

Abstract: The invention relates to a method of assembling two optical fiber preforms together end-to-end, the method comprising the following operations: the two cylindrical preforms are placed in alignment along a common longitudinal axis; the preforms are rotated about the common longitudinal axis; the facing ends of said preforms are heated by a heater; and the preforms are moved towards each other parallel to the common axis to press them against each other so as to form intimate contact between the ends after cooling. According to the invention, the heating is performed by causing the preforms or heater to move in a radial direction orthogonal to the common longitudinal axis in such a manner as to heat the peripheries and then the cores of said preforms.

Mobile device for automatic pipe welding

Abstract: A device for butt welding pipes (99A-B) comprises: a guide element (17) which can surround and can be fixed to one of the ends of the pipes, and a carriage (1) movable along the said guide element and having powered means (25) for moving it along the guide element (17), a welding torch (90), means (29) for feeding it and means (26) for supporting the said welding torch (90) and moving it vertically and horizontally with respect to the said carriage, and means of movement (27) for imparting the oscillatory movement to the said torch and for regulating the amplitude of oscillation and the position of the torch during this oscillation; the regulating and monitoring means (108) are of the electronic type; and means (104) are provided for generating a signal relating to the angular movement of the welding torch (90) during the oscillation.

The distortion gap width and stresses in laser welding of thin elastic plates

Abstract: Two thin elastic plates in the form of infinite half planes are joined together as a butt weld by a moving general heat source travelling at constant speed. The stresses along the weld direction and the distortion of the unwelded open end resulting from the welding process are evaluated using a Mellin-transform technique. The final result for an infinite plate is expressed in terms of a convolution integral and illustrated by numerical calculations for the point heat source of Rosenthal as an approximation to the general heat source. The distortion of the unwelded section for the case of the infinite plate is compared with that for a thin plate of finite size computed by a finite-element method.

Techniques for adaptive control of force in resistance welding applications

Abstract: The present invention is an improved butt welding technique that provides adaptive control of force that is applied to a part during a welding process to enable a maintained joint resistance across joint. The force may be adjusted to account for the changing conditions of the part. The present invention may be implemented within any electrical welder having at least one movable platen for carrying a part to be welded, at least one hydraulic cylinder coupled to the movable platen, the hydraulic cylinder having a first chamber and a second chamber, and a servo valve coupled to the hydraulic cylinder. The present invention includes means for making voltage drop measurements across the joint to be welded. The voltage measurements provide feedback as to whether the force should be adjusted. A force control module may be implemented to provide controlled force to the part.

Measurement of molten pool shape and penetration control applying neural network in TIG welding of thin steel plates

Abstract: An intelligent welding robot system with visual sensors is developed in order to realize full automatic welding of thin mild steel plates including automatic seam tracking and automatic control of welding conditions. A system to detect the shape and dimension of molten pool using CCD camera and a penetration control system using Neural Network in TIG arc welding are investigated. In order to characterize the shape of molten pool, width, length and area of the molten pool were measured, and are used to form the contour of the molten pool as shape parameters. These parameters are input to the neural network, which outputs optimum welding conditions to control the penetration of the molten pool. Consequently, if unexpected changes occur in welding conditions, such as root gap, welding speed and so on, the welding system can optimumly control the welding conditions. The constructed system is tested and found to be effective for penetration control in automatic butt welding of thin mild steel plates.

A thermoplastic, unibody transfer device

Abstract: The present invention is directed to a thermoplastic, unibody transfer device. This transfer device includes a membrane, and a housing surrounding the membrane. The housing includes a thermoplastic end cap and a thermoplastic shell. The end cap and shell are butt welded together. Additionally, there is a method of manufacturing with the aforementioned device. The method includes forming a bundle of a membrane, inserting the bundle into a shell, butt welding an end cap to the bundle and the shell so that the cap, bundle, and shell are fused together.

Method of drawing fiber continuously by butt welding optical fiber preforms

Abstract: In the method of drawing fiber continuously from preforms for manufacturing an optical fiber, a first preform is displaced along a fiber-drawing axis and is drawn into an optical fiber through a fiber-drawing furnace disposed on the fiber-drawing axis, and a second preform is displaced along the fiber-drawing axis, which second preform is butt welded to the first preform so as to be drawn into an optical fiber following on from the first fiber. The two preforms are butt welded, i.e. they are welded together end-to-end, by displacing at least one power laser along the fiber-drawing axis, and by servo-controlling the displacement of said laser to the displacement of the two preforms so as to maintain a laser beam emitted by the power laser at the same height as the two ends to be welded together, thereby making it possible to reduce considerably the size of the zone affected by the welding, and to avoid polluting the side surfaces of the two preforms upstream and downstream from the weld.

Structure of friction welding part for axial member and friction welding method

Abstract: PROBLEM TO BE SOLVED: To enhance a welding accuracy, and to miniaturize a device by thinning the meeting layer and the heat-affected layer of a joining part while securing the welding strength of axial members. SOLUTION: In the structure of a friction welding part performing butt welding by rotating relatively a first shaft 11 and a second shaft 21 each other on the same axial line while applying a pressure welding force in the axial line direction, a recessed part 13 is formed, which has a tapered inner peripheral surface 14 on the joining end face 12 of the first shaft 11, and a projecting part 23 is formed, which has a tapered outer peripheral surface 24 corresponding to the tapered inner peripheral surface 14 on the joining end face 22 of the second shaft 21. By welding the tapered inner peripheral surface 14 and the tapered outer peripheral surface 24, both shafts 11, 21 are subjected to friction welding.

Aluminum alloy plate for super plastic forming, aluminum alloy tube and its super plastic formed body

Abstract: PROBLEM TO BE SOLVED: To obtain a wide width aluminum alloy plate for super plastic forming and to integrally form a large formed body by subjecting rolled plates of super plastic aluminum alloy each other to solid-state welding. SOLUTION: Solid-state welding is a joining method not remaining a solidified structure to a joining part. It is preferable for solid-state welding to use friction agitation welding, flash butt welding, DC butt welding, resistance welding. A super plastic aluminum alloy is either of Al-Mg alloy, Al-Zn-Mg alloy, Al-Zn-Mg- Cu alloy, Al-Cu alloy, Al-Li alloy, Al-Mg-Si alloy, Al-Si alloy, etc., a recrystallization grain is refined, a grain size is preferably =40% or softening annealing to a degree not generating recrsytallization in a process to produce a rolled plate.

Welding machine and method for assembling same

Abstract: In a resistance welding machine, an arm including one electrode tip, a drive unit including a linear guide for driving another electrode tip corresponding to the one electrode tip, and a welding unit including a welding transformer for passing a secondary current through a gun bracket for supporting the present resistance welding machine on a robot and/or the present resistance welding machine, can be mounted and removed individually as a unit with a common base or a rail main body including the linear guide as the reference thereof.

Butt welding machine for metal plate

Abstract: PROBLEM TO BE SOLVED: To reduce wear of a metal plate clamp device in a metal plate joining device with which a laser beam welding is performed by butting metal plates each other. SOLUTION: In a metal plate butting welding equipment in which an electric current for melting is fed through butting ends of both metal plates 1 and 2 which are clamped with upper clamps 15, 17 and lower clamps 4, 7 from an electric current supply device 105 for electric current for melting, at the same time, the metal plates pressurized to each other, the projecting parts of butting end faces are melted and butt welding is performed with no gap left, the electric current supply device for melting metal is connected to the upper clamp and attached to it, and the upper clamp is given electrical conductivity and the lower clamp, high wear resistance.

Improved method of solid state welding and welded parts

Abstract: A method of solid state welding for joining metal parts having opposed planar and parallel surfaces which includes quickly heating the opposed surfaces of the metal parts with a high frequency induction heater to the hot working temperature of the metal parts in a non-oxidizing atmosphere, continuously moving at least one of the parts relative to the other part generally parallel to the parallel surfaces of the parts, and quickly bringing the opposed surfaces of the parts together with an axial force approximately equal to the conventional friction welding forging force while continuing the relative motion of the parts until the absorbed kinetic energy is approximately equal to ten percent of the energy input required by conventional friction welding. The resultant weld is of a quality equal to or greater than normal friction welding but has a much smaller volume of flash and requires significantly less kinetic energy than conventional friction welding and is performed at rotational velocities well below the normal critical surface velocity of friction welding. The welded metal part includes a generally planar flash extending radially from the inner section of the opposed planar welded surfaces having a volume corresponding to a combined loss of length of less than 0.2 axial inches per inch of wall thickness. Thus, the disclosed solid state welding method is substantially more efficient than prior friction or other welding methods and results in an improved product.

Method of joining by friction stir welding

Abstract: PROBLEM TO BE SOLVED: To provide a method of friction stir welding which can prevent end faces of the joining parts from separating at the butt without providing rib, etc., even in case that the backing material cannot be utilized. SOLUTION: In the method of joining two parts by friction stir welding consisting of forming an engagement fitting each other at the butt 10 of both parts, butting both parts by engaging at the butt, pressing a tool 9 against the butt 10 under rotation and joining both parts by friction stir welding, the engagement has a configuration where both parts cannot be rotated around the butt 10. For another method of joining two parts by friction stir welding consisting of forming an engagement fitting each other at the butt 10 of both parts, butting both parts by engaging at the butt, pressing a tool 9 against the butt 10 under rotation and joining both parts by friction stir welding, the engagement has a configuration which can allow engaging of both parts only by inserting each part into another in the direction parallel to the surface of joining parts. COPYRIGHT: (C)2001,JPO

Method of magnetically impelled arc butt welding

Abstract: A press welding process which can be used in such industries as car-making, production of hot-water boilers, industrial and civil construction, in construction of pipelines using small and medium diameter pipes, for welding parts with a solid and developed cross-section, as well as for joining parts to form a T-joint. A magnetically impelled arc butt welding is achieved, that, during heating, the controlled continuous displacement of the parts being welded is performed where the gap between the parts edges is kept constant. The value of the welding arc voltage is used as the parameter for the gap size adjustment, and the moment of achievement of the required temperature on the edges of parts being welded, is determined by the length of the relative displacement of the parts, and when the assigned values of displacement have been reached, the speed of the arc movement along the edges of the parts being welded, is programmed. An improved quality of the welded joints produced by magnetically impelled arc butt welding is obtained.

Device for butting and joining belt-like metal sheet

Abstract: PROBLEM TO BE SOLVED: To provide a butt welding in which a clearance between upper clamps is adjusted easily and exactly in accordance with the thickness of a metal sheet. SOLUTION: This device consists of the upper clamps 5a, 5b which are oppositely arranged providing the clearance Go above a worktable 1a, lower clamps 15a, 15b providing two slender stopper guide grooves in parallel-like, stoppers 26a, 26b which are freely slidable in the state where the head parts are slightly projected from the top surface of the lower clamps in the stopper guide grooves, work clamps 6a, 6b for fixing both works a1, a2 on the worktable, pressing guide plates for pressing and holding the tip parts of both the works on the lower clamps, setting plates 27 mounted to the upper parts of the works in the state where the plates are inserted under the pressing guides and an arc guide which is inserted and mounted rotatably in the vicinity of the work butting parts, on the top surface of the head part of which the tip part of a TIG welding electrode rod 20 is situated and with which welding arc is generated.

Ultrasonic Butt Welding of Aluminum and Stainless Steel Specimens Using a 15 kHz Welding System

Abstract: The welding characteristics of aluminum and stainless steel plate specimens of 6 mm thickness joined by a 15 kHz ultrasonic butt welding system are studied. Both materials are anticorrosive and have various applications due to small deformation at the welded part. The specimens without special surface treatment were joined end to end with the weld strength of 100 MPa. The hardness of aluminum decreases at the area close to the welded surface, which is the same as in other materials. The hardness of stainless steel increases by approximately 20% near the welded surface. The increase in hardness due to ultrasonic vibration was observed for the first time though only the decrease in hardness was mentioned in previous studies.

Resistance welding machine control method

Abstract: A resistor welding machine control method for calculating a temperature distribution at a portion to be welded by using changes in welding current and voltage across two welding electrodes during welding and information on sheet combination sequence at a spot-welding position, and for controlling at least the welding current or pressure applied to the electrodes by using the calculated temperature distribution. The present invention can thus provide a resistor welding machine control method capable of controlling welding quality accurately. Spot-welding position information, wear comparison information and the like are available as other information.

Machine for welding hollow articles and process for welding these articles

Abstract: Machine for welding hollow articles and process for welding these articles, for example half-shells of a plastic fuel tank, using the technique of hot-plate welding. A particular process in which the articles to be welded together are preshaped by pressing against a cold plate, which might not be plane, by stretching or compressing the side walls of the articles or by pressing against the walls of a mold. Process applied to the manufacturer of injection-molded/welded fuel tanks. Use of the machine for manufacturing such tanks.

Fusion welding method

Abstract: PROBLEM TO BE SOLVED: To provide a fusion welding method by which a formation of an intermetallic compound is minimized and a welded part having both of large shearing strength and tearing strength is given in a joining of different materials, and a structure constructed by the method. SOLUTION: In a fusion welding method where different materials which form an intermetallic compound by being fused together are welded, a process where a first member 1 forming a butted part and a lapped part at a joining part and a second member 2 whose melting point is higher than that of the first member are combined, arid a process where a butt welding and a lap welding are executed by fusing the side of the second member, fusing only the joining part of the first member side by a heat conduction from the second member side as for the joining part of a butted part 3 and a lapped part 4, thus the joining part of the second member side is substantially not fused, are provided.

Internal expansion steel tube butt welding machine

Abstract: The utility model relates to an internal expansion steel tube butt welding machine, which comprises a welding machine and a heater, wherein, the welding machine is composed of oil cylinders, pistons, piston rods, slide blocks and cones, wherein, the pistons (2) and (11), the piston rod (3) and the cone (5) are fixedly connected together; the piston (9), a sliding sleeve (8) and the cone (6) are fixedly connected together and sheathed on the piston rod (3); the oil cylinder (10) and the oil cylinder (12) are connected together; the piston rod (3) is inserted into a plurality of oil cylinders; a plurality of slide blocks are arranged around the cones by dovetail grooves; the weld quality of the internal expansion steel tube butt welding machine is good; the internal expansion steel tube butt welding machine can finish weld in a few minutes, and can enhance production efficiency; because the utility model adopts the mutual weld of parent metals, weld joints do not have the defects of pores, slag enclosures, etc.; the mechanical property of the weld joints is fundamentally the same with the mechanical property of the parent metals. The utility model has the advantages of simple structure and convenient operation, and can be used for convenient weld in a narrow place.

Method of welding generally rod-shaped structures of a fluorine-containing plastic material in a butt weld

Abstract: The invention relates to a method of welding two generally rod-shaped structures (5, 6) of a fluorine-containing plastic material in a butt weld to form a closed-loop construction. The structures may comprise sealing or backup rings for use in high pressure swivels. The method comprises steps of: placing the end faces of the structures in a contacting relationship by supporting each structure in a clamping device (3, 4) at a distance from its end face, and applying heat to the end parts of the structures that project from the clamping device. The end faces are pressed together by moving the clamping devices (3, 4) towards each other such that a welding pressure of between 0.05 and 0.5 Nmm-2, perpendicular to the end faces, is transmitted from the clamping devices to the end faces via the end parts of the structures, wherein the distance of the heating element from the end parts is sufficient to substantially prevent the heated parts of the structures to contact the heating element (10). The heating element surrounds the end parts along a substantially closed contour, and may comprise two segments which can be hinged into an open or closed position to be removed from the completed weld. The heating element may be energized in accordance with a predetermined heating profile, wherein the temperature of the weld area is measured and the heating operation of the heat generating member is increased or decreased to transmit and absorb heat from and into the heat reservoir member such that the temperature of the weld area is maintained within a predetermined margin around the heating profile. By using the method according to the present invention a very uniform and non-deformed butt weld can be produced under accurate temperature control of the weld area. Because the heating element does not directly contact the inner parts a uniform temperature distribution throughout the sealing volume can be achieved without degradation of the fluorine containing plastic material.

Process for welding hollow articles

Abstract: Machine for welding hollow articles and process for welding these articles, for example half-shells of a plastic fuel tank, using the technique of hot-plate welding, in which the mirror is in the form of separate elements which can be moved independently. Particular processes in which the articles to be welded together are preshaped by pressing against cold-plate elements, which might not be plane, by stretching or compressing the side walls of the articles or by pressing against the walls of a mould. Process applied to the manufacturer of injection-moulded/welded fuel tanks. Use of the machine for manufacturing such tanks.

Method for joining thick metal plate

Abstract: PROBLEM TO BE SOLVED: To perform the butt welding of the thick metal plate so that a deformation caused by a welding angle and shrinkage do not generate and weld defects do not generate. SOLUTION: On the butted surface part of two thick metal plates 1 to be joined, many holes 2 piercing through in the plate thickness direction are prepared preliminarily, disposing in a line in the plate width direction by drilling or grooving. The parts of the holes 2 disposing in a line in the plate width direction, are melted by vertical welding, and the butted surface part of the two thick metal plates is joined. The welding of the holes 2 parts is performed every two places or alternately from the center toward the end of the metal plate.

Method for packaging ink-jet printing head

Abstract: A method for packaging ink-jet printing head features use of the flexible TAB circuit board as transmission mainshaft and the standardized manufacture equipment, and includes butt welding between crystal chip of printing head and the connection points of TAB circuit board and butt connection between jetting hole piece and the crystal chip of printing head. Said process is an automatic band-rolling flow process. Its advantages are low cost and high quality of product.

Pipeline welding goes mechanized

Abstract: Spread four has bugs in the cornfield--but not to worry. The bug referred to here is a mechanized welding bug, specifically a single welding head, computer-aided gas metal arc (GMAW) system from CRC-Evans Automatic Welding powered by a Miller Electric XMT{reg{underscore}sign} 304 inverter-based welding machine. The bug operator and owner of 32 inverters is Welded Construction, L.P., of Perrysburgh, Ohio. Spread four is a 147-mile stretch of the Alliance Pipeline system (Alliance) cutting through the cornfields of northeast Iowa. While used successfully in Canada and Europe for onshore and offshore pipeline construction for 30 years, this is the first large-scale use of mechanized welding in the US on a cross-country pipeline. On longer, larger-diameter and thicker-wall pipe projects--the Alliance mainline has 1,844 miles of pipe, most of it 36-in. diameter with a 0.622-in. wall thickness--mechanized GMAW offers better productivity than manual shielded metal arc welding (SMAW). In addition, high-strength steels, such as the API 5L Grade X70 pipe used on the Alliance, benefit from the low-hydrogen content of certain solid and tubular wire electrodes.