臺灣博碩士論文加值系統

中文摘要
本論文討論含硫量對焊接固化表面波紋的影響，以及對熔區外型的改變。銲接固化表面波紋(weld surface ripples)是指銲接熔融金屬凝固後在表面形成週期性高低起伏條紋，而此波紋會隨著焊接條件的不同而有所變化，而其中表面張力與表面張力溫度係數會造成熔池自由表面的變形使固化後產生波紋，然而，表面張力與表面張力溫度係數又會隨著金屬所含的活性元素量而改變。本研究使用尺度分析預測焊接波紋的平均粗糙度，並與實驗驗證，發現有良好的準確性。

Abstract
The occurrence of ripples on the workpiece surface after solidification in electron-beam weld or melting is experimentally and analytically investigated. The maximum accelerating voltage and welding current of electron-beam welder are 60kV and 50mA, respectively, while the workpieces are four different materials containing different quantities of sulfur. Using a scale analysis to account for heat transfer and fluid flow induced by different quantities of surface active element in the molten pool. The result predicted results show good agreement with experimental data.

謝誌………………………………………………………………………i
英文摘要………………………………………………………………..ii
中文摘要………………………………………………………………..iii
目錄……………………………………………………………………..iv
圖目錄…………………………………………………………………..vi
表目錄…………………………………………………………………..vii
符號說明………………………………………………………………...ix
第一章簡介……………………………………………………………1
第二章實驗方法………………………………………………………5
1.實驗儀器…………………………………………………….5
2.實驗步驟…………………………………………………….6
第三章理論分析……………………………………………………...10
第四章結果與討論…………………………………………………...14
第五章結論…………………………………………………………...17
參考文獻……………………………………………………………….33

參考文獻Anthony, T. R., and Cline, H. E., 1977, “Surface Rippling Introduces by Surface Tension Gradients During Laser Surface Melting and Alloying,” Journal of Applied Physics, Vol. 48, pp. 3888-3894.Mills, K.C., and Keene, B. J., 1990, “Factors Affecting Variable Weld Penetration,” International Materials Reviews, Vol. 35, pp. 185-216.D’annessa, A. T., 1970, “Sources and Effects of Growth Rate Fluctuations Suring Weld Metal Solidification,” Welding Journal, Vol. 62, pp. 346-s to 355-s.Garland, J. G., and Davies, G. J., 1970, “Surface Rippling and Growth Perturbations During Weld Pool Solidification,” Metal Construction and British Welding Journal, Vol. 2, pp. 171-175.Ecer, G. M., Tzavaras, A., Gokhale, A. and Brody, H. D., 1982, “Weld Pool Fluid Motion and Ripple Formation in Pulsed-Current GTAW,” in: Trends in Welding Research in the United States, S. A. David, ed., Proceedings of a conference sponsored by the Joining Division of American Society for Metal, New Orleans, Nov. 16-18, 1981, pp. 419-442.Arata, Y., Matsuda, F., and Murakami, T., 1973, “Some Dynamic Aspects of Weld Molten Metal in Electron Beam Welding,” Transactions of Japan Welding Research Institute, Vol. 2, pp. 23-32.Sen, A. K., and Davis, S. H., 1982, “Steady Thermalcapillary Flows in Two-Dimensional Slots,” Journal of Fluid Mechanics, Vol. 121, pp. 163-168.Zebib, A., Homsy, G. M., and Meiburg, E., 1985, “High Marangoni Number Convection in a Square Cavity,” Physics of Fluids, Vol. 28, pp. 3467-3476.Ostrach, S., 1982, “Low-Gravity Fluid Flows,” Annual Review of Fluid Mechanics, Vol. 14, pp. 313-345.Rivas, D., and Ostrach, S., 1992, “Scaling of Low-Prandtl-number Thermocapillary Flows,” International Journal of Heat and Mass Transfer, Vol.35, pp. 1469-1479.Ostrach, S., Kamotani, Y., and Lai, C. L., 1985. “Oscillatory Thermocapillary Flows,” PCH PhysicoChemical Hydrodynamics, Vol. 6, pp. 585-599.Schwabe, D., and Scharmann, A., 1979, “Some Evidences for the Existence and Magnitude of a Critical Marangoni Number for the Onset of Oscillatory Flow in Crystal Growth Melts,” Journal of Crystal Growth, Vol. 46, pp 125-131Xu, J-J., and Davis, S. H., 1984, “Convective Thermocapillary Instabilities in Liquid Bridges,” Physics of Fluids, Vol. 27, pp. 1102-1107P. Sahoo, T. Debroy, and M. J. Mcnallan, 1988, “Surface Tension of Binary Metal-Surface Active Solute System under Condition Relevant to Welding Metallurgy,” Metallurgical Transactions B, Vol. 19B, pp. 483-491.Rivas, D., 1991, “High-Reynolds-Number Thermocapillary Flows in Shallow Enclosures,” Physics of Fluid A, Vol.3, pp. 280-291.White, F. M., 1979, Fluid Mechanics, McGraw-Hill, New York, pp. 353-360.