546 results about "Weld pool" patented technology

To overcome 1) the high levels of porosity due to coating material vaporization and entrapment into the weld, 2) spewing of molten base metal from the weld leaving holes and pits in the weld, and 3) humping effects when oblong beam configurations are used at higher weld speeds to weld coated materials, the present invention features an energy source (10) with multiple separated energy beams (24, 26) (formed by using multiple separate beam sources or manipulation of a single beam (14) into separated multiple energy beams (44, 46) using wedge mirror (18) and parabolic focusing mirror (20)) that produces high quality (porosity free) lap welds in a weld stack (50) of layered materials (30, 32) coated with coating material (28, 28', 34, 34') with zero gap at interface (38) during the welding process. An energy source (12) with multiple, separated energy beams (24, 26) extends the beam keyhole and increases the time and conditions available for vapor/gas to diffuse less violently through the molten weld pool.

A workpiece stack-up that includes at least a steel workpiece and an aluminum-based workpiece can be resistance spot welded by employing a multi-stage spot welding method in which the passage of electrical current is controlled to perform multiple stages of weld joint development. The multiple stages include: (1) a molten weld pool growth stage in which a molten weld pool is initiated and grown within the aluminum-based workpiece; (2) a molten weld pool solidification stage in which the molten weld pool is allowed to cool and solidify into a weld nugget that forms all or part of a weld joint; (3) a weld nugget re-melting stage in which at least a portion of the weld nugget is re-melted; and (4) a re-melted weld nugget solidification stage in which the re-melted portion of the weld nugget is allowed to cool and solidify.

The invention provides a weld method compounding an ultrasonic and a gas metal arc welding so as to make use of the cavitation effect and the vibration effect of the ultrasonic to lead welding drops generated by the gas metal arc welding to be smoothly transmitted to a welding pool when the drops are still small. And when in welding, an electric arc shrinks under the effect of the ultrasonic and then the stiffness of the electric arc can be enhanced, which has a significant application value for welding of special positions such as a full-position welding, an overhead position welding, a flat position welding and a horizontal position welding, etc.. The invention includes the following steps: an ultrasonic generator is connected with an ultrasonic transducer 2 to convert ultrasonic energy into mechanical vibration; an ultrasonic transformer 3 enlarges amplitude; a conductive tip 5 is combined with the ultrasonic transformer; a protective gas nozzle 4 is fixed on the vibration node of the transformer; a welding wire 1 is connected with the conductive tip 5 to start a welding power supply 9 and then start an ultrasonic power supply after the electric arc becomes stable, then the transducer converts electrical energy into vibration and the ultrasonic transformer enlarges the ultrasonic amplitude which is transmitted to a melting electrode.

The invention provides an arc welding robot welding monitoring system which is based on visual sensing in the arc welding robot technical field. The invention comprises a welding robot, a robot controller, a visual sensing system, an interface circuit device, a main control computer, and a dual inverter arc welding power source; wherein, the visual sensing system dynamically collects the images of a welding pool and transmits the images to the main control computer which receives the image information which is provided by the visual sensor and achieves the image processing; furthermore, the main control computer adjusts the dual inverter arc welding power source and controls the welding robot through the interface circuit device according to the processing results; the interface circuit device consists of a simulation signal output sub-module, a welding switch and process state detection sub-module and a robot controller general I/O sub-module; the welding robot receives a moving instruction signal which is emitted by the main control computer, and the welding is achieved by moving a welding gun. The invention improves the monitoring capability of the user to the welding process of the arc welding robot, and widens the application range of the robots in the welding automation field.

In a direct metal deposition system which builds up a metallic overlay on a substrate by moving the substrate relative to a laser in a metallic powder feed, the laser power is adjusted for successive layers by sensing the weld pool in a plurality of selected points in each layer and adjusting the power during successive layers to maintain a weld pool that corresponds to those achieved during deposition of a lower optimal layer. This compensates for heating of the substrate resulting from the deposition which tends to increase the pool size or temperature in the higher layers.

Disclosed is a method for hybrid welding in which a laser beam is applied to the welding position of objects to be welded, and at the same time, a first wire is fed to the welding position so as to perform arc welding using an arc generated between the objects to be welded and the first wire. In this method, one or more second wires are fed to a molten weld pool formed by the laser beam and arc welding, thereby increasing the amount of welding without increasing the arc current.

A welding method includes feeding a welding electrode axially from a welding torch, moving the welding electrode radially in a desired pattern with respect to a central axis of the welding torch by a motion control assembly within the welding torch, transmitting from control circuitry a signal corresponding to a position of the welding electrode relative to a weld joint or weld pool, advancing the welding torch or a workpiece to establish a weld, and transferring material from the welding electrode to a first location in an area of the weld pool. The welding electrode moves radially while feeding the welding electrode from the welding torch, the material from the welding electrode is transferred to the first location during a first cycle of the desired pattern, and the first location is controlled based at least in part on the signal.

PCT No. PCT/EP97/07274 Sec. 371 Date Dec. 1, 1999 Sec. 102(e) Date Dec. 1, 1999 PCT Filed Dec. 19, 1997 PCT Pub. No. WO98/28130 PCT Pub. Date Jul. 2, 1998In the welding of aluminum alloy, structural components, e.g. in the aerospace industry, one of the welded components is a sheet product having a core and a clad layer of filler material. During welding, the clad layer provided filler for the welding pool, and the core remains substantially unmelted. Consequently, adhesion between the core and the clad layer maintains its strength, e.g. keeps at least 80% of its pre-welding strength.

The invention discloses an ultrasonic vibration and welding wire feed system composite welding method and a device thereof which are provided with a stable welding process, high quality of welding seams, controllable welding pool grain growth phenomenon after welding, and high welding quality in normal welding surroundings. The objective is achieved by following steps: transmitting cavitation effect and vibration effect to the welding pool during the welding wire and welding pool contacting process by broadcasting the ultrasonic in the welding wire feed system. The melt drop size at the terminal of the welding wire is controlled effectively by ultrasonic action during welding process, transition from melt drop to welding pool is more stable, and welding seam quality is further improved. Since ultrasonic is applied in the welding feed system during welding process, welding wire melt drop transition condition is affected, energy distribution status during welding process is improved, thereby refinement and homogenization degree of the joint, and mechanical property such as intensity are further enhanced.

The invention relates to a laser-arc hybrid welding method which reinforces dynamic effect of current and magnetic fluid, belonging to technical field of laser material processing. The invention is characterized in that: a synergistic arrangement of laser and electric arc is adopted and a filler wire is added simultaneously; wherein, the electric arc and the wire are arranged at both sides of a laser beam; the wire is arranged in the front and is contacted with a workpiece, and the electric arc is arranged at the back; the two polarities of the welding power are connected with a tungsten electrode and the wire respectively; the welding power forms a current loop by flowing through a weld pool and the electric arc by the wire, and most of the welding power flows through the weld pool and produces electromagnetic force. The invention has the advantages that the energy coupling efficiency and the stability in the welding process are both highly improved by fully utilizing influence of dynamic effect of arc current and magnetic fluid on the heat exchange situation and the flowing state of the weld pool, and the surface forming state of a weld joint is greatly improved because of the significantly improved tolerance of the electric arc arranging at the back of the weld pool to the wire fluctuation.

The formation of spot welds in high strength steel workpieces is improved by using welding electrodes with annular, or donut shaped welding tips for the formation of the molten metal weld pool at the weld site. The annular poll solidifies to form an annular weld nugget. Preferably the donut shaped nugget has an internal diameter that is no more than three-quarters of the outside diameter. The method is applicable to carbon steel workpieces with allowing elements for strengthening, and to thick sheets of mild carbon steels.

The invention discloses a hybrid welding method and hybrid welding equipment for laser electromagnetic pulse. The method can be used for laser seam welding and laser spot welding technology, a pulsed high magnetic field is applied to a welding region during the process of laser welding on a workpiece with the effect of laser beams so as to mutually react with an induced plasma, a welding pool and a stress strain field through welding and complete welding task. The equipment comprises a laser device, an electromagnetic pulse generator, a numerical control system, an optical transmission system and a laser electromagnetic pulse combined machining head. The combined machining head is used for integrating the laser beams with the pulsed high magnetic field and adjusting the distance between an electromagnetic conversion device and the workpiece; the combined machining head is arranged on a machine tool. The structural deformation can be reduced, the welding quality and machining efficiency are improved, and insurmountable technical problems when a metallic material structure is manufactured through existing single welding technology are solved.

The invention discloses a laser additive and subtractive composite manufacturing device and method. The device comprises a subtractive system, a laser additive system, a control system and a monitoring system, wherein the subtractive system is a five-axis linkage machine tool, the laser additive system comprises a laser device, a water cooling device and a pulverizing device, the control system isconnected with the subtractive system and the laser additive system through signals, and the monitoring system is connected with the control system through signals and used for acquiring a weld poolimage and workpiece dimension parameters and transmitting the weld pool image and the workpiece dimension parameters to the control system. The manufacturing method is characterized in that additive and subtractive operations are performed by the aid of the device and repeated until processing is qualified. The method has the advantages of high yield, low running cost and the like.

The invention provides an electric arc wire filling additive manufacturing method for an inclined thin-walled structural part. The electric arc wire filling additive manufacturing method is used for manufacturing the inclined thin-walled structural part forming a certain included angle with a substrate. When multiple layers of single-pass inclined thin-walled parts are stacked, a first layer is formed by lapping two stacked weld beads, so that the problem of weld pool flowing due to excessive offset during stacking of a second layer is effectively solved; and when the second layer and subsequent layers are stacked, a welding gun horizontally shifts for a certain distance in a direction perpendicular to the height, thereby forming an inclined structure. According to the electric arc wire filling additive manufacturing method disclosed by the invention, the problems of high equipment cost, complex system, low forming precision of stacked parts and the like of an existing inclined thin-walled structural part are solved; the forming of the inclined thin-walled structural part can be finished in a mode of not turning over the substrate by a positioner; high-quality forming of the inclined thin-walled structural part is realized; and in addition, the method is easy in automation of forming process.

The invention discloses an on-line monitoring system and method for a weld pool dynamic process. The on-line monitoring system for the weld pool dynamic process comprises an integrated control center, a sensing detection subsystem, a motion control subsystem, an expert database, a welding process control subsystem and a data transmission interface. The integrated control center is used for receiving data information, sending motion control instructions, welding process control instructions and data and reading instructions. The sensing detection subsystem is used for acquiring weld pool image information, process information, acoustical signals and temperature. The motion control subsystem is used for accomplishing weld seam tracking, welding gun height adjustment and speed control. The expert database is used for storing welding process control parameters, motion control parameters and sensing detection information. The welding process control subsystem is used for achieving control on welding current, arc voltage and speed. The data transmission interface is used for achieving data communication. The on-line monitoring method adopts the monitoring system to carry out on-line monitoring. The on-line monitoring system and the on-line monitoring method for the weld pool dynamic process have the advantages of being high in reliability, highly integrated in function and the like.

A welding method and apparatus for welding workpieces together by conducting a laser beam welding process on a joint region that includes a weld seam defined by and between faying surfaces of the workpieces, and then conducting a hybrid laser arc welding process on the joint region. The laser beam welding process entails causing a first laser beam to travel along the joint region, penetrate the weld seam and form a weldment. The hybrid laser arc welding process remelts the weldment by simultaneously causing an electric arc and a second laser beam to overlap and travel along the joint region and form a weld pool in the weldment. On cooling, a weld joint is formed within the joint region and its weld seam.

A double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method is implemented by the following steps: cleaning up sundry, carrying out groove processing on the welding position of a wall plate of a stainless steel storage tank, welding position welding, choosing welding torch equipment, aligning a same weld pool by a main welding torch and an auxiliary welding torch from the inside and outside of a weld joint respectively synchronously, arcing synchronously by the main welding torch and the auxiliary welding torch, enabling the auxiliary welding torch to be moved synchronous to the main welding torch, welding along the same direction at the same speed, and stopping arcing by the main welding torch and the auxiliary welding torch synchronously. By adopting the double two-sided synchronous tungsten electrode high-frequency pulse argon arc welding butt welding method, the inner side forming of the weld joint is protected and penetrated, the defects of oxidation, overlap, lack of penetration and the like of the weld joint are avoided, the processes of root clearing, grinding and re-welding on the inner side are omitted, compared with the prior art, the method has the advantages of simple method and easy implementation, the production efficiency is greatly improved, and the labor intensity of workers is lowered.

A process is provided for laser beam welding of surface treated steel components. Two steel components, at least one of which is a surface treated steel component, are relatively arranged to form a joint that is to be welded. Using a laser beam, the two steel components are irradiated along the joint so as to heat materials within each of the two steel components to a welding temperature, and thereby form a weld pool. During welding a metallic constituent is introduced into a leading edge of the weld pool, in front of the laser beam along a welding direction. The introduced metallic constituent combines with a species, which is released into the weld pool from the surface treated steel component, to form a compound that is stable within the weld pool at the welding temperature.

The invention relates to a laser filler wire welding method for a thick plate narrow gap, and belongs to the technical field of laser material processing. The laser filler wire welding method for the thick plate narrow gap is characterized by comprising the steps that positive out-of-focus laser beams are adopted, the laser beams enter a narrow gap groove of a workpiece to be welded and act on the bottom and the side wall of the groove, and a welding pool is formed in a thermal conducting welding mode; a filler wire enters the welding pool in a wire forward feeding mode and is heated through the welding pool to be molten, the gap is filled with the molten wire to form a weld joint, and a thick plate is connected in a single-path multi-layer welding mode. According to the laser filler wire welding method for the thick plate narrow gap, the thermal conducting welding mode and the mode that the filler wire is heated through the welding pool to be molten are adopted, and the welding process is stable; meanwhile, the laser beams act on the side wall of the groove so that the welding defects such as the defect that the side wall is incompletely fused can be effectively avoided.

A method for inspecting an additive manufacturing process in which a directed energy source is used to create a weld pool at an exposed build surface of a mass of powdered material, and selectively fuse the powdered material to form a workpiece. The inspection method includes: using a noncontact method to generate an acoustic wave in the build surface; using a noncontact method to measure displacement of the build surface in response to the acoustic wave; and determining at least one sub-surface material property of the workpiece by analyzing the displacement of the build surface.