361 resources related to Spot welding
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APEC focuses on the practical and applied aspects of the power electronics business. Not just a power designer’s conference, APEC has something of interest for anyone involved in power electronics including:- Equipment OEMs that use power supplies and converters in their equipment- Designers of power supplies, dc-dc converters, motor drives, uninterruptable power supplies, inverters and any other power electronic circuits, equipments and systems- Manufacturers and suppliers of components and assemblies used in power electronics- Manufacturing, quality and test engineers involved with power electronics equipment- Marketing, sales and anyone involved in the business of power electronic- Compliance engineers testing and qualifying power electronics equipment or equipment that uses power electronics
IEEE International Conference on Plasma Science (ICOPS) is an annual conference coordinated by the Plasma Science and Application Committee (PSAC) of the IEEE Nuclear & Plasma Sciences Society.
The International Conference on Robotics and Automation (ICRA) is the IEEE Robotics and Automation Society’s biggest conference and one of the leading international forums for robotics researchers to present their work.
The Conference focuses on all aspects of instrumentation and measurement science andtechnology research development and applications. The list of program topics includes but isnot limited to: Measurement Science & Education, Measurement Systems, Measurement DataAcquisition, Measurements of Physical Quantities, and Measurement Applications.
INTERMAG is the premier conference on all aspects of applied magnetism and provides a range of oral and poster presentations, invited talks and symposia, a tutorial session, and exhibits reviewing the latest developments in magnetism.
The IEEE Transactions on Advanced Packaging has its focus on the modeling, design, and analysis of advanced electronic, photonic, sensors, and MEMS packaging.
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Component parts, hybrid microelectronics, materials, packaging techniques, and manufacturing technology.
Provides leading edge information that is critical to the creation of reliable electronic devices and materials, and a focus for interdisciplinary communication in the state of the art of reliability of electronic devices, and the materials used in their manufacture. It focuses on the reliability of electronic, optical, and magnetic devices, and microsystems; the materials and processes used in the ...
Publishes original and significant contributions relating to the theory, design, performance and reliability of electron devices, including optoelectronics devices, nanoscale devices, solid-state devices, integrated electronic devices, energy sources, power devices, displays, sensors, electro-mechanical devices, quantum devices and electron tubes.
Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251), 1999
This paper deals with the nonlinear modeling of the electrical subsystem associated with the resistance spot welding (RSW) process. This will be used in the design of model-based nonlinear control strategies to achieve welds of good quality. Switched-state, thyristor driven, linear and nonlinear transformer models have been developed that characterize the electrical dynamics. A detailed parameter estimation algorithm has also ...
IVMC '95. Eighth International Vacuum Microelectronics Conference. Technical Digest (Cat. No.TH8012), 1995
Nitrides of transition metals such as Nb, Zr, Ti etc. are very hard and electrically conductive like a metal. Their melting points are very high. Their work functions have been reported to be very low, typically less than 4 eV, which is much less than the work functions of W and Mo. These are desirable features for field emitters. Here ...
1997 Proceedings 47th Electronic Components and Technology Conference, 1997
Continued trends in miniaturization of electronic components place ever increasing demands for development of high density interconnections and cable assemblies, especially as they apply to portable electronics. This paper evaluates feasibility of one of such developments based on a laser microwelding of small diameter wires to contacts in cable assemblies for portable electronics. More specifically, the paper addresses characterization of ...
Proceedings of the 36th SICE Annual Conference. International Session Papers, 1997
Establishes a welding energy model and describes a fuzzy adaptive process control scheme for a resistance spot welding system. For a welding system, it is not easy to measure online the output, the nugget size, by usual measuring methods. It is also difficult to control the welding process in real time. The paper proposes a method using input welding energy ...
21st IEEE/NPS Symposium on Fusion Engineering SOFE 05, 2005
The lower divertor of the DIII-D tokamak is being modified to provide improved density control of the tokamak plasma during operation in a high triangularity double null configuration. This divertor replaces the low triangularity advanced divertor installed in 1990. The design and analysis of the lower divertor is complete and hardware is being fabricated. Installation of the new divertor is ...
Multi-Function VCO Chip for Materials Sensing and More - Jens Reinstaedt - RFIC Showcase 2018
Developing Point-of-Care Technologies
Mark I. Montrose: Testing for EMC Compliance
Prosthetic Hand Restores Amputee's Sense of Touch - IEEE Spectrum Report
HKN Member Ray Kurzweil Receives Award at 2014 EAB Awards Ceremony
HKN Member Hermann W. Dommel Receives an Award at the 2014 EAB Award Ceremony
HKN Member Asad M. Madni Receives Award at 2015 EAB Awards Ceremony
IEEE Entrepreneurship @ Hello Tomorrow Global Summit: Bluefield Tech
This paper deals with the nonlinear modeling of the electrical subsystem associated with the resistance spot welding (RSW) process. This will be used in the design of model-based nonlinear control strategies to achieve welds of good quality. Switched-state, thyristor driven, linear and nonlinear transformer models have been developed that characterize the electrical dynamics. A detailed parameter estimation algorithm has also been implemented to identify the circuit parameters and the models have been validated against experimental results.
Nitrides of transition metals such as Nb, Zr, Ti etc. are very hard and electrically conductive like a metal. Their melting points are very high. Their work functions have been reported to be very low, typically less than 4 eV, which is much less than the work functions of W and Mo. These are desirable features for field emitters. Here field emission characteristics of transition metal nitrides were examined. The nitrides were fabricated by heating the raw metals in ammonia gas. Among the nitrides examined, the NbN emitters gave the most stable field emission current.
Continued trends in miniaturization of electronic components place ever increasing demands for development of high density interconnections and cable assemblies, especially as they apply to portable electronics. This paper evaluates feasibility of one of such developments based on a laser microwelding of small diameter wires to contacts in cable assemblies for portable electronics. More specifically, the paper addresses characterization of laser spot welded 32 AWG solid copper/silver plated wires to contacts on 0.050 in. centers. The copper alloy contacts were provided on strips in two lots, one unplated, and the other with 75 /spl mu/in. of plated nickel. To simulate manufacturing environment, an industrial type IR, Nd:YAG, pulsed laser was used to produce welds. Quality of the welds was evaluated by metallurgical analysis, tensile testing, SEM, and nanoindentation characterization. These methods have been also used in setting up the welding process parameters. Tensile test results obtained, during this study, on the laser welded interconnections are presented in a statistical format. They indicate that the tensile strength of the laser welded wire, relative to a bare (unwelded) wire, was 95.47% for joints on unplated contacts, and 98.25% for nickel plated contacts. Microscope examination of the samples, after pull test, shows that all wires broke behind the weld area. These results are encouraging because they have significantly exceeded the required minimum tensile strength of a welded joint, i.e., 60% of the tensile strength of the bare wire. They also indicate that laser microwelding of small diameter wires to high density contacts can be considered as a valuable process alternative in manufacturing of cable assemblies for portable electronics.
Establishes a welding energy model and describes a fuzzy adaptive process control scheme for a resistance spot welding system. For a welding system, it is not easy to measure online the output, the nugget size, by usual measuring methods. It is also difficult to control the welding process in real time. The paper proposes a method using input welding energy to estimate the nugget size and to assess the welding process. An optimal welding energy reference model is found and compared with different input methods of welding energy. A fuzzy adaptive process control scheme with the model is also described to realize real time control and to improve control performance. The results of simulation and experiments show that the reference model is effective for reducing energy loss and producing a sound nugget and the fuzzy adaptive control scheme may obtain an optimal control process for resistance spot welding.
The lower divertor of the DIII-D tokamak is being modified to provide improved density control of the tokamak plasma during operation in a high triangularity double null configuration. This divertor replaces the low triangularity advanced divertor installed in 1990. The design and analysis of the lower divertor is complete and hardware is being fabricated. Installation of the new divertor is scheduled to be completed by the end of 2005. The primary component of the lower divertor is a toroidally continuous flat plate. The plate is water cooled for heat removal. Three rows of graphite tiles are mechanically attached to the plate to shield it from plasma impingement. Owing to a concern over excessive erosion caused by plasma impingement, the through tile-face bolt holes have been eliminated from graphite in areas of high heat flux. The plate is water cooled for heat removal between shots and heated to 350degC with hot air and inductive current during vessel baking. The divertor plate is supported 100 mm from the vacuum vessel floor by two rows of 24 supports that must react the vertical loads due to halo currents. These supports are radially flexible to allow for differential radial thermal expansion between the divertor ring and the floor. The space below the plate forms a pumping plenum connecting the floor strike point to the lower cryopump. Upgraded floor tiles inboard of the plate will be installed to improve the target for the plasma strike point for outer leg pumping. The divertor plate is to be fabricated in four 90 deg sectors from type 316 stainless steel. Each sector consists of two plate halves with three machined coolant channels and is joined together by spot welds and perimeter seam TIG welds. The vacuum tight 90 deg plate sectors are welded together inside the vessel to form a toroidally continuous ring. The water cooling/air bake-out lines connecting the 4 sectors into two 180 deg cooling circuits will be welded in situ. Several plasma diagnostics will require some modification or relocation for integration into the divertor system
Radiation induced electrical transients in strain gage, nickel temperature sensor, silicon temperature sensor, and thermocouple circuits have been studied in the Kukla Prompt Critical Pulsed Reactor environment. Induced signals, which could obscure real data, were observed in many strain gage circuits. It was determined that the observed signals were the result of a voltage appearing between the strain gages and ground when the reactor was pulsed. Circuit arrangements were devised and tested which reduced the magnitude of the induced signals to less than 1 mV. Nickel temperature sensors and spot welded thermocouples operated satisfactorily in the reactor environment. No adverse effects due to transient signals and no changes in calibration were observed. The one type of silicon temperature sensor tested suffered large and permanent increases in resistance when exposed to a reactor pulse.
The paper deals with the constant current control for single-phase AC resistance spot welding (RSW), which is the most commonly used control strategy in modern welding industry. The process of RSW is nonlinear and time- varying. After analyzing the working principle and nonlinear properties of RSW, a mathematical relation between input and output variables for constant current control is developed. A PI controller, which is used to regulate the desired current used in the mathematical relation, is employed to improve the performance. The final experimental results showed the performance obtained by new controller was better than that by a fine-tuned PID controller.
This paper deals with the analytically described iron core model of a midfrequency resistance spot welding transformer. This model considers eddy currents, hysteresis, and the saturation effect in a laminated iron core. The proposed model is simple, based on parameters that can be obtained from a data sheet, and is easy to integrate into the circuit model of the transformer. It is applicable for the design of control algorithms, as well as a rough optimization of lamination thickness, air gap width, and sizing the transformer's core.
Led filament welding mostly completed by adopting manual welding, low efficiency and high defective rate, to solve the problems of traditional LED filament welding, in this paper, a LED filament spot welding robot based on machine vision is designed. The robot can identify the lamp filament and lamp post on the production line instead of artificial, acquire the target image to process, extracting solder joint location information to complete the corresponding welding operation. The paper focus on the general structure of the robot, expounds the working principle of the robot vision system, makes intensive study on image segmentation algorithm, designed image acquisition, gray level transformation, two value transformation, edge detection and so on a series of image processing procedures. Finally, the simple 3D model of the production line and the robot body is established.
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