薄板のビート溶接時の温度分布と冷却速度

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In order to evaluate degradation of base metal, thermal stresses and distortions developed as a result of welding, it is necessary to know a minute detail of thermal history during welding. Therefore, many important contributions have been done since Rosenthal has given the first analytical solution of the heat flow equation. However, the analytical solution of the heat flow equation is too difficult to apply for determination of transient thermal cycle nearby heat source of welding because of the assumptions that the heat source is concentrated in a point or line, the physical properties are independent of temperature, and latent heat of fusion is neglected. While many experimental studies have been made, there still remain some questions in accuracy and reliability of the results of measurement. The analytical solution is suited to the quasi-stationary state, whereas numerical solution may be applied at any stage of the process without the above-mentioned limitations that apply to the analytical method. However, the degree of correlation with experiment has not yet been fully established. In this paper, the finite element method of analysis for transient heat conduction is employed to calculate thermal cycle in thin steel plates resulting from a moving gas tungsten arc weld heat source. In an attempt to refine our knowledge and improve the degree of correlation with reality, much of the work has been directed toward determining thermal cycle nearby heat source. Descriptions for calculating and measuring temperatures are presented first, followed by evaluation of cooling rates at various temperatures and locations, and correlations of analytical and numerical results.
社団法人日本船舶海洋工学会の論文
1979-08-20

薄板のビート溶接時の温度分布と冷却速度

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