Evaluation and Analysis of Underwater "Wet" Welding Process
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The Ohio State University / OhioLINK
1999
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1391793136 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu13917931362021-08-03T06:21:45Z Evaluation and Analysis of Underwater "Wet" Welding Process Clukey, David Alan Systems Science Engineering The research performed during this investigation included an analysis and evaluation of wet welding processes. Three areas were selected for evaluation, SMAW waterproof coatings, SMAW cooling rate control, and FCAW cooling rate control.Moisture absorption, electrode performance, and weld quality tests were performed to evaluate the optimum polymer and dipping procedure. The polymers selected for use were Polyurethane, Epoxy, PVC, and Polyethylene. Of the four evaluated, polyethylene was determined to be the optimum choice based on the excellent dive test results. The coating provided superior protection over previously tried wax with respect to storage and moisture absorption while having no apparent effect on electrode performance.Cooling rate control in underwater wet SMAW was also evaluated. To control the cooling rates, thermal insulation was placed adjacent to the fusion line. Mathematical models predicted that ideal insulation on the front side of the plate would adequately protect the weld pool vicinity and would both increase peak temperature and slow the cooling rate. Results validated the mathematical model when the insulation was properly placed immediately adjacent to the weld fusion line. However, insulation placement was determined to be critical to obtaining good results. Placement of the insulation at a distance of only 1-2 mm from the fusion line proved to be ineffective. When used properly however, weldment properties improved significantly.Cooling rate control was also investigated in FCAW local dry spot welding. Previous finite difference modeling showed that if the water was removed from a small area surrounding the arc vicinity, the cooling rate could be slowed significantly. Preliminary research showed that 2t radius bends could be produced when using 308L stainless filler metal, but porosity was a problem. To better protect the weld, a new cup and shroud was designed and evaluated for effectiveness. Radiography, bend tests, Charpy tests, tensile tests, hardness tests, and metallography were performed on weldments using the improved process. Test results met or exceeded AWS D3.6 -93 Class A requirements. A more robust seal using a momentum barrier is proposed to obtain consistent results. 1999 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1391793136 http://rave.ohiolink.edu/etdc/view?acc_num=osu1391793136 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Systems Science Engineering |
| spellingShingle |
Systems Science Engineering Clukey, David Alan Evaluation and Analysis of Underwater "Wet" Welding Process |
| author |
Clukey, David Alan |
| author_facet |
Clukey, David Alan |
| author_sort |
Clukey, David Alan |
| title |
Evaluation and Analysis of Underwater "Wet" Welding Process |
| title_short |
Evaluation and Analysis of Underwater "Wet" Welding Process |
| title_full |
Evaluation and Analysis of Underwater "Wet" Welding Process |
| title_fullStr |
Evaluation and Analysis of Underwater "Wet" Welding Process |
| title_full_unstemmed |
Evaluation and Analysis of Underwater "Wet" Welding Process |
| title_sort |
evaluation and analysis of underwater "wet" welding process |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
1999 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1391793136 |
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AT clukeydavidalan evaluationandanalysisofunderwaterwetweldingprocess |
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1719435378813829120 |