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Computational and experimental studies were performed to determine the effect of static thermal insulation on the quality of wet shielded metal arc welds. A commercially available heat flow and fluid dynamics spectral-element computer program was used to model a wet SMAW and to determine the potential effect on the weld cooling rate of placing thermal insulation adjacent to the weld line. Experimental manual welds were made on a low carbon equivalent (0.285) “mild steel” and on a higher carbon equivalent (0.410) “high tensile strength” steel, using woven fabrics of alumina-boria-silica fibers to insulate the surface of the plate being welded.
Table of Content: Introduction, comparison of wet and dry underwater welding process, applications of underwater welding procedures. Background, technical problems associated with Wet SMA welds, material limitations of wet SMA welding, technological advances in wet SMAW. Reduction of weld cooling rates through thermal insulation, experimentation with insulation of wet welds, practical use of insulation. Computational thermal modeling of a wet sma weld, history of wet weld analytical and computational models, general modeling method, modeling procedure, verification of the computational model, computed results, modeling conclusions. Experimental procedure, description of the experimental procedure and equipment, evaluation of experimental welds, experimental results, results from hardness teasing and visual inspection of welds mad of mild steel plates, results form visual inspection of welds made on high strength steel plates, conclusion.
Tags : tensile strength steel, silica fibers, arc welds, thermal insulation, metal arc, spectral element, carbon equivalent, material limitations, computational models, underwater welding, smaw, procedure description, experimental procedure, welding process, computational model
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