The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator

 

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dc.contributor.advisor Enslin, NC de V en_ZA
dc.contributor.author Cardwell, Geoffrey Robert en_ZA
dc.date.accessioned 2016-03-21T19:03:03Z
dc.date.available 2016-03-21T19:03:03Z
dc.date.issued 1970 en_ZA
dc.identifier.citation Cardwell, G. 1970. The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18013
dc.description.abstract The machine to be used as the power source is first evaluated by means of the usual indirect tests. These tests confirm that the machine has acceptable steady state characteristics for welding and a basic excitation control circuit is employed to give the desired control of the output from the generator. The initial welds made are very unsatisfactory and attempts to improve the weldability by modifying the characteristics of the control circuit are unsuccessful. Only by increasing the time constant of the output circuit through the addition of series inductance can the desired improvements be obtained. At this stage an investigation into the electrical characteristics of the D.C. welding arc is carried out. This reveals the extreme transient nature of the arc load on the generator and design criteria for good weldability can now be employed to achieve satisfactory results. Field excitation of the alternator is varied by means of current feedback from the output circuit which is able to produce high welding currents when using a low voltage reference supply from a battery. The initial evaluation has to be repeated on a new design of alternator and tests indicate that a suitable A.C. reactor in the output from the alternator will produce a more desirable transient response to the arc load. Different types of current control are tried in order to obtain the best type and range of welding characteristics. The design of the most important components which make up the welding generator is discussed and the proposed layout for the complete set is given. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Electrical Engineering en_ZA
dc.title The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Electrical Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc (Eng) en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Cardwell, G. R. (1970). <i>The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/18013 en_ZA
dc.identifier.chicagocitation Cardwell, Geoffrey Robert. <i>"The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1970. http://hdl.handle.net/11427/18013 en_ZA
dc.identifier.vancouvercitation Cardwell GR. The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1970 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18013 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Cardwell, Geoffrey Robert AB - The machine to be used as the power source is first evaluated by means of the usual indirect tests. These tests confirm that the machine has acceptable steady state characteristics for welding and a basic excitation control circuit is employed to give the desired control of the output from the generator. The initial welds made are very unsatisfactory and attempts to improve the weldability by modifying the characteristics of the control circuit are unsuccessful. Only by increasing the time constant of the output circuit through the addition of series inductance can the desired improvements be obtained. At this stage an investigation into the electrical characteristics of the D.C. welding arc is carried out. This reveals the extreme transient nature of the arc load on the generator and design criteria for good weldability can now be employed to achieve satisfactory results. Field excitation of the alternator is varied by means of current feedback from the output circuit which is able to produce high welding currents when using a low voltage reference supply from a battery. The initial evaluation has to be repeated on a new design of alternator and tests indicate that a suitable A.C. reactor in the output from the alternator will produce a more desirable transient response to the arc load. Different types of current control are tried in order to obtain the best type and range of welding characteristics. The design of the most important components which make up the welding generator is discussed and the proposed layout for the complete set is given. DA - 1970 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1970 T1 - The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator TI - The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator UR - http://hdl.handle.net/11427/18013 ER - en_ZA


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