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.advisorEnslin, NC de Ven_ZA
dc.contributor.authorCardwell, Geoffrey Roberten_ZA
dc.date.accessioned2016-03-21T19:03:03Z
dc.date.available2016-03-21T19:03:03Z
dc.date.issued1970en_ZA
dc.description.abstractThe 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.identifier.apacitationCardwell, 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/11427/18013en_ZA
dc.identifier.chicagocitationCardwell, 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/11427/18013en_ZA
dc.identifier.citationCardwell, 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.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
dc.identifier.urihttp://hdl.handle.net/11427/18013
dc.identifier.vancouvercitationCardwell 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/11427/18013en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleThe electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generatoren_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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