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The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator
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 gener...
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| Format: | Thesis |
| Language: | English |
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Department of Electrical Engineering
2016
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| _version_ | 1867614406047694848 |
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| access_status_str | Open Access |
| author | Cardwell, Geoffrey Robert |
| author2 | Enslin, NC de V |
| author_browse | Cardwell, Geoffrey Robert Enslin, NC de V |
| author_facet | Enslin, NC de V Cardwell, Geoffrey Robert |
| author_sort | Cardwell, Geoffrey Robert |
| collection | Thesis |
| description | 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. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18013 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:51:31.998Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Electrical Engineering |
| publisherStr | Department of Electrical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18013 The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator Cardwell, Geoffrey Robert Enslin, NC de V Electrical Engineering 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. 2016-03-21T19:03:03Z 2016-03-21T19:03:03Z 1970 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18013 eng application/pdf Department of Electrical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Electrical Engineering Cardwell, Geoffrey Robert The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| thesis_degree_str | Master's |
| title | The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| title_full | The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| title_fullStr | The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| title_full_unstemmed | The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| title_short | The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator |
| title_sort | electrical characteristics of the direct current welding arc and the design and testing of a d c welding generator |
| topic | Electrical Engineering |
| url | http://hdl.handle.net/11427/18013 |
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