Criteria for Monitoring and Control of Resistance Spot Welding Through Dynamic Data System (DDS) Analysis of Electrode Voltage PDF Download
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Author: Scott Lewis West
Publisher:
ISBN:
Category : Electric welding
Languages : en
Pages : 226
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Book Description
Author: Scott Lewis West
Publisher:
ISBN:
Category : Electric welding
Languages : en
Pages : 226
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Book Description
Author: University of Wisconsin--Madison. Engineering Experiment Station
Publisher:
ISBN:
Category : Engineering
Languages : en
Pages : 408
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Author: Y M Zhang
Publisher: Elsevier
ISBN: 1845694406
Category : Technology & Engineering
Languages : en
Pages : 311
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Book Description
Welding is a complex process, is increasingly automated, and operates at higher speeds in more difficult environments. Defects also need to be detected as they arise to ensure efficient, high-quality production. All these needs have led to a growing interest in the use of sensors to provide accurate, robust, real-time monitoring where this cannot be achieved by more traditional testing and inspection techniques. This important book reviews the range of monitoring techniques available and their applications. After an introductory chapter, the first part of the book reviews the range of sensor technologies in welding, from arc and optical sensors to infrared and ultrasonic techniques. Part two discusses the monitoring of particular aspects of welding such as weld seams and profiles, the analysis of weld penetration and weld pool surface, as well as monitoring of resistance and laser welding. With its distinguished editor and international team of contributors, Real-time weld process monitoring is a valuable reference to all those concerned with improving the quality of welding and welded components. Reviews the range of monitoring techniques available Examines the range of sensor technologies in welding from arc and optical sensors to infrared and ultrasonic techniques Discusses the monitoring of specific aspects of welding such as weld seams, resistance and laser welding
Author: Xuetao Zhang
Publisher:
ISBN:
Category : Electric welding
Languages : en
Pages : 204
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Book Description
Author: Mian Mohsin Irshad
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The resistance measurement in the resistance spot welding (RSW), is an ongoing research topic. The high current flow during the welding process induces an electromagnetic field in the wires which are attached to the electrodes to measure tip voltage. This results an additional voltage drop which is proportional to the derivative of current. Also the presence of silicon controlled rectifier (SCR) in the welding power supply generates harmonics in both supply voltage and current. These issues together complicate the methods for resistance estimation. A set of simultaneous linear equations is derived for the on-line measurement of dynamic resistance and induced voltage constant by using the dynamic circuit analysis of weld setup. This can be solved to determine the weld resistance using instantaneous phasors measurements for the 1st, 3rd and 5th harmonics of current and measured voltage signals. The instantaneous phasor measurements for these desired harmonics are obtained by employing the following proposed method. In this thesis, a new method for the measurement of instantaneous phasor is proposed for the narrow band signals. The proposed algorithm is based on the internal model principle (IMP) defined for the cancellation of a sinusoidal disturbance signal. The IMP has two states, exhibiting the properties of being sinusoidal and orthogonal. The instantaneous values of IMP states are defined as real and imaginary components of a complex signal at each time instant. The instantaneous measurements of envelope and phase of a sinusoidal signal are determined from instantaneous values of complex signal by using arithmetic properties of complex numbers. In case of signal comprising of sum of sinusoids of different frequencies, the approach for obtaining instantaneous phasor for each sinusoidal component is presented by connecting multiple internal models in the parallel and open-loop configuration. The instantaneous phasor measurement of fundamental frequency signal is not only advantageous in detecting faults like short circuiting, harmonic distortion and frequency variations but it can also be applied to protect power system from these faults. In this work, the applicability of the proposed instantaneous phasor measurement algorithm is analyzed for scenarios of power disturbances due to the the harmonic distortion and decaying DC offset. The results are discussed and compared with few existing methods.
Author: Jin Xiao
Publisher:
ISBN:
Category :
Languages : en
Pages : 296
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Book Description
Author: Michael John Karagoulis
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 422
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Author: M. M. Ateeg
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: British Standards Institution
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Author: American Welding Society
Publisher:
ISBN: 9780871710086
Category : Automobiles
Languages : en
Pages : 84
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Book Description
