Distortion removal in structural weldments
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Author
Duffy, David Kenneth
Date
1970-05Advisor
Masubuchi, Koichi
Metadata
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The use of flame straightening of welded structures is discussed along with other methods which are just being developed. System models were constructed on 3/8 inch A1S1 1020, low-alloy, high-strength U.S. Steel t-1 plates. These models were designed to resemble panel structures encountered in shipbuilding. Welding procedures for all samples were held constant. Point of application of the flame as well as quenching techniques, were varied in the experiments. The results of testing are presented in the form of distortion plots of the samples. Plots were made as welding proceeded and as various flame straightening methods were tried. In this study, it was shown that for the same welding procedure, the amount of distortion decreased as the yield strength of the materials used was increased, Flame heating with a water quench afterwards was found to be the only technique found to be effective on this type of panel structure. It was shown that there is probably no corridor of yield strength where flame straightening is most appropriate, rather factors such as boundary conditions and heating techniques appear to be the more controlling variables. Recommendation for additional study are given with emphasis on developing an analytical model and testing various techniques of flame and quench application in order to determine optimum methods.
Description
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.