Showing papers on "Butt welding published in 2001"

Spot welding system and method for sensing welding conditions in real time

Abstract: Methods and apparatus are provided for monitoring resistance spot welding process conditions in real time by using welding data in an energy balance model in integral form to estimate the mean weld temperature and to predict process conditions such as occurrence of splash, and weld diameter. Using predicted welding process conditions, welding parameters are modified in real time to prevent splash and produce sound welds.

Method for the control and/or regulation of a welding process

Abstract: The invention relates to a method for the control and/or regulation of a welding process, whereby on striking an arc (15), a welding process, adjusted according to various different welding parameters, is carried out. The control and/or regulation of the welding process is carried out by means of a control device (4) and/or a welding current source (2). During the welding process, the welding device (1) may be switched, in particular the functions and/or the operation types and/or the welding parameters and/or the welding programmes may be switched, without interrupting the welding process, in particular, without interrupting the arc (15), by means of a particular movement of the welding lance (10). For carrying out the switching, a welding parameter, in particular a welding or arc voltage and/or arc current is monitored and on exceeding and/or falling below a threshold value for the welding parameter, the switching of the welding device (1) is carried out by the welding controller.

Multi-application welding system and method

Abstract: A welding gun comprising a welding handle and at least one interchangeable assembly. A plurality of interchangeable assemblies are securable to the welding handle to enable the welding gun to be configured for operation in a plurality of welding applications. A first interchangeable assembly enables the welding gun to receive gas and wire. A second interchangeable assembly enables the welding gun to receive flux and wire. The welding gun is coupled to a power source. The welding gun may be coupled to a flux reservoir or a source of gas. The welding gun may be coupled to the system by a cable operable to convey wire, gas, and flux to the welding handle.

Characteristics of dissimilar welding of alloy 690 to 304L stainless steel

Abstract: The object of the present work is to research the dissimilar welding of nickel based 690 alloy and SUS 304L stainless steel using two alternative Inconel filler metals, namely, 82 (I–82) and 52 (I–52). Gas tungsten arc welding with identical parameters and procedures was used to carry out single V groove butt welding with six passes in four layers on nickel based alloy 690 and 304L stainless steel. Mechanical and corrosion resistance tests were performed. Metallographical, fractographical, and compositional analysis were used to study filler metal dissimilarities. Mechanical tests show that the I–82 weldment, owing to its denser dendrites and formation of abundant niobium enriched precipitates, has a higher strength and hardness than the I–52 weldment. Rupture occurred in the alloy 690 base metal. In comparison, the I–52 weldment, with coarse dendrites and no niobium enriched precipitates, exhibits superior corrosion resistance to the I–82 weldment but has a lower tensile strength and ruptured in ...

Simulation of Multipass Welding With Simultaneous Computation of Material Properties

Abstract: Multipass butt welding of two 0.2 m thick steel plates has been investigated. The objective is to calculate residual stresses and compare them with measured residual stresses. The material properti ...

System and method facilitating fillet weld performance

Abstract: The present invention provides a welding system and methodology to facilitate an improved fillet weld. The system includes an arc welding subsystem providing a fillet weld that joins one or more members. The arc welding subsystem controls one or more welding parameters and utilizes one or more controlled process variables, to facilitate geometric control of a toe angle, a toe radius, a throat dimension and a penetration depth associated with the joining of the fillet weld and the one or more members. The present invention also includes optimized welding parameters, welding wire alloys, and welding gas mixtures to promote an improved fillet weld.

Inventory of consumables in electric arc welding process

Abstract: Information pertaining to characteristics of metal welding electrode wire and which characteristics are useful in connection with adjusting welding parameters in an arc welding process and/or selecting between operating modes in a welding system are encoded on welding wire and/or on other memory components such as bar code labels and tags, RFID cards and tags, IC cards, and Touch Memory buttons, and the memory device is scanned prior to and/or at the point of use of the welding wire for enabling tracking of product distribution, manual and/or automatic selection of an operating mode for the welding system, manual and/or automatic adjustment of welding parameters in a given operating mode, consumables inventory, and the like.

Profiling arrangement with a roll forming machine and with a welding device

Abstract: A profiling arrangement ( 1 ) with a roll forming machine ( 2 ) including several roller-type forming tools ( 6 ) and with a welding device ( 3 ) positioned in its processing path makes possible the application of more than one weld joint to a workpiece ( 51, 52, 53, or 54 ) to be manufactured. The welding device includes a single energy source and this source is connected with at least two welding heads ( 9 ) and ( 10 ) for producing both weld joints. The energy produced by welding device ( 3 ) is divided over the individual welding heads ( 9 and 10 ). This is especially favorable in the case of a welding device ( 3 ) with a laser-beam source. The laser beam can be split into several partial laser beams and guided to the individual laser-beam welding heads.

Friction stir welding method and welded body

Abstract: PROBLEM TO BE SOLVED: To obtain a defect-free welded body in a butt welding method by a friction stir welding method between metallic materials, between organic materials, or a metallic material and a organic material, different in physical characteristics or mechanical characteristics. SOLUTION: On one material side out of welding materials, a pin part of a rotary tool is inserted, and on the other side, a shoulder part is made to come into contact. In this state, friction stir welding is performed. The two members are subjected to diffusion and welding.

Copying welding equipment

Abstract: A copying welding machine, wherein right and left running wheels are supported on a pair of bearing units pivotally installed on a vehicle, respectively, and drivingly running power source, a driving force transmission mechanism transmitting the rotation of the drivingly running power source to the right and left running wheels, a welding torch, a sensor detecting the route of welding, a control motor normally and reversely rotated by receiving a signal detected by the sensor, and a steering mechanism rotating the bearing units according to the amount of rotation of the control motor, whereby various types of automatic weldings including not only a fillet welding between a steel plate and an erected wall on the steel plate but also a butt welding between steel plates can be performed.

Laser welding processed

Abstract: In a laser welding method, occurrence of weld defects is effectively prevented, and a high-quality weld joint is provided; and in addition, a wide range of material processes including a laser-using de p-penetration welding technique can be implemented. In keyhole welding using a laser performing output pulse modulation, the welding is conducted in accordance with a frequency conforming to a natural fr queucy of a metal molten pool.

Arc welding apparatus

Abstract: An arc welding apparatus comprising a combination of a teaching-playback robot and an arc welding power source is provided. Even when, in changing a welding method, one welding power source for one welding method is replaced by another welding power source for another welding method, the welding apparatus does not require an adjustment between a robot controller and the latter arc welding power source for consistency between them. The arc welding apparatus comprises a teaching -playback robot comprising a robot body and a robot controller and a welding power source including a controller. The robot controller and the controller of the welding power, source both have a communication controller, and communicate with each other using a digital signal. On the basis of information on the welding method transmitted from the welding power source, the welding method is automatically set into the robot controller.

Quality control of laser welds of tailored blanks using guided waves and EMATs

Abstract: In modern design of automobile bodies reduction in weight and maximisation of the structural stiffness and passive safety are the main challenge. The ‘tailored blank’ has contributed to achieving a significant weight reduction in recent years. Single flat sheets are joined by laser welding into the desired configuration without filler wire. Usually the quality of the welds is assured by precise preparation of the plate edges and measurement of two of the process parameters. However, due to process deviations, defects occur, which make non-destructive testing (NDT) necessary. These defects include incomplete welding, lack of fusion, misalignment of the weld, holes and porosity. The paper presents a versatile ultrasonic (UT) inspection technique designed for in-line inspection of laser welds of tailored blanks. Conventional ultrasonic tetsing is ruled out because of the necessary liquid coupling medium. Therefore, the proposed inspection approach is based on the application of guided ultrasonic (plate) waves with shear horizontal polarisation excited and detected by couplant-free electromagnetic acoustic transducers (EMATs).

Method of welding metals and apparatus for use therefor

Abstract: A method for welding parts using the thermo-electrical output of the metals to be welded to control and evaluate the welding process in which a single energy pulse, such as an electric current or a laser, containing a known amount of electricity is applied to the metals to heat the metals to be welded. Then the thermo-electric output of the metals to be welded is used to determine the mass of the metals. The energy necessary to effectively weld the metals is then determined as a function of the mass.

Method for manufacturing seam welded steel pipe

Abstract: PROBLEM TO BE SOLVED: To provide a method for stably manufacturing a seam welded steel pipe of good seam quality at a high welding efficiency without generating the excessive melting of the end face corner part of the edge part of an open pipe and the insufficient melting inside the end face of the edge part even if t/D is relatively large. SOLUTION: In the method which comprises continuously forming a steel strip 10 into the open pipe 11 with a group of forming rolls 4, heating both the edge parts of the open pipe by high-frequency heating at the melting point of steel or above and carrying out the butt welding of the edge parts with squeeze rolls 6, each of the corner parts C 1 -C 4 of both the ends in the width direction and the thickness direction of the steel strip before forming it into the open pipe are chamfered in a tapered shape with the taper angles θ 1 -θ 4 of more than 30° and 80° or less and the taper heights H 1 -H 4 of 5-40% of the thickness t of the steel strip. COPYRIGHT: (C)2003,JPO

Method for the projection welding of high-carbon steels and high-tension low-alloy steels

Abstract: This invention provides an improved method of projection welding which enables the sound welding of high-carbon, and high-tension low-alloy steels. A spacer is disposed between two parts to be joined by projection welding. At least one of the parts is made of a high-carbon, or high-tension low-alloy steel. The spacer is a thin sheet, or coating formed on at least one of those parts.

Method for closing used hole on top of gas turbine blade

Abstract: PROBLEM TO BE SOLVED: To provide a closing method for a used hole on the top of a gas turbine blade in which the cracks developed by coagulation or liquefaction can surely be prevented from occurring by controlling a heat input amount, a firm welding can be performed by a laser welding with narrow bead width, workability is improved and a uniform product good in reproducibility can be obtained. SOLUTION: A chip plug 56 is mounted on and fitted to the seat part 55a of a used hole 55 which is formed on the top 52 of the gas turbine blade and from which a core or the like is taken out, and then the butted parts T are welded by forming the butt welding parts 57 using YAG laser beam, thus closing the used hole 55 with the chip plug 56. In this case, clearance of the butted part T, material of the chip plug 56, a laser welding condition, focus position of the laser beam and the like are optimized.

Butt welding method by laser beam

Abstract: PROBLEM TO BE SOLVED: To improve a working efficiency by reducing a number of welding processes and to realize a butt welding method capable of forming a stable excess weld metal SOLUTION: A Y type opening part of a base material 8 is formed so that a width of a V type part bottom 13 and a straight zone 14 is welded by a laser beam from the opening end of V type part Then, the V type part is welded The back side of the base metal 8 is not recessed by the welding of the straight zone 14 Thus, the welding process to form the excess weld metal at the back side of the base metal by an arc heat reservoir or a laser beam is not required, and the welding process will be the first process of welding the straight zone 14 and the second process of welding the V type part Therefore, the butt welding method can be improved by reducing the number of welding processes and can be realized by the laser beam capable of forming a stable excess weld metal

Horizontal seam boxcar side wall

Abstract: Smooth interior walls for steel boxcars are provided by an improved fabrication technique. The boxcar side wall is constructed using a horizontal offset seam joined by welding. There are no vertical butt welds in the side assembly, which butt welds and the reinforcements associated with such welds have traditionally caused damage to sensitive cargo like newsprint rolls.

Combined heat source welding method

Abstract: PROBLEM TO BE SOLVED: To provide a combined heat source welding method which makes it possible to obtain higher welding quality by high-speed welding using a laser beam and is capable of butt welding members, such as large-sized structures and thick plates in particular, with which high accuracy is hardly obtainable, with high quality. SOLUTION: In butt welding of steel products, butt members are first melted by a nonconsumable electrode arc 1 to fill a spacing 13 of the butt members with molten metal and next, the deep layers of the butt members are melt joined by irradiating these layers with the laser beam 2 from above the molten metal 15 of the spacing position and finally, the recess of the surfaces generated by melting of the butt members is supplemented with molten metal of an electrode rod by a consumable electrode arc 3.

Spot welding method and spot welding device

Abstract: PROBLEM TO BE SOLVED: To easily perform the spot welding by the friction stirring and joining operation using a rotary tool. SOLUTION: A work in the vicinity of the rotary tool 1 is held by a work holding means and subjected to the friction stirring and joining operation. The work holding means is provided so as to surround the rotary tool, and movable in the direction of the axis of rotation of the rotary tool independently from the rotary tool. Thus, any deformation of the work caused by the spot welding can be suppressed. Further, any labor of fixing the work can be substantially saved in the spot welding by the friction stirring and joining.

Process for joining hollow section strips by welding

Abstract: To prevent formation of a welding bead in the area of the weld on at least one wall when hollow section strips ( 1 ) are being joined by butt welding, on at least one wall of the ends of the hollow section strips ( 1 ) to be joined to one another by welding, edges ( 7 ) are produced which are set back relative to the end faces ( 5 ) of the hollow section strips ( 1 ) and the ends of the hollow section strips ( 1 ) are moved so close to one another in the execution of the welding process that the edges ( 7 ) touch and the welding process ends as soon as the edges ( 7 ) touch one another.

Welding metal components uses welding beams on either side of components which melt processing zone over complete cross-section of welding bead

Abstract: Welding metal components (10,11) uses welding beams (12,13) on either side of the components. These melt the processing zone (16) over the complete cross-section of the welding bead. An Independent claim is included for apparatus for carrying out the method.

Apparatus for joining together two metallic bands

Abstract: The invention relates to a machine for butting two metal bands (M1, M2) and a method for implementing such a machine. According to the invention, two successive bands (M1, M2) are welded according to either one of at least two different welding modes, for example flash butt welding and laser welding. To this effect, two clamping jaw assemblies are available, suitable respectively to each welding mode and, when changing welding mode, the first jaw assembly (2, 3, 2′, 3′) used previously for welding is removed from the machine (S) and replaced with the second jaw assembly (20, 30, 20′, 30′) suitable to the second welding mode. During this operation, the jaws remain spaced apart so that replacement can take place as the first band unwinds to an end, before the running has stopped.

Method for laser welding a workpiece

Abstract: A method is used for laser welding a workpiece along a welding line. At least two laser beams, which are offset in relation to one another, are guided along the welding line by moving an optical deflector unit. The method may be used for welding closure pins and casting induced openings of gas turbine blades.

Butt welding method

Abstract: PROBLEM TO BE SOLVED: To provide a butt welding method with which axial precision between two parts is improved and bending of the parts with welded heat shrinkage can be restrained. SOLUTION: A jig 2 used for the butt welding is provided with a V arm 4 having a V-shaped supporting surface 4a, and an axial adjustment of the V arm 4 to a center part 3, is beforehand performed to secure the axial precision of this V arm 4. In this way, the axes of the parts 1 can be held by being matched with the centers of the center parts 3 by pushing the parts 1 laid on the supporting surface 4a of the V arms 4 with flat pushers 5. Thereafter, the end surfaces of both parts 1 are butted to each other in the axial direction and the joining parts of both the parts 1 are irradiated with welding energy. At that time, since the heat shrinkage at the welding time can be cancelled by irradiating with the welding energy from the opposite peripheral parts of (e.g. at 180 deg. angle), the bending of the parts 1 can be restrained and the precision between the parts after welding can be improved.