本研究是以理論與實驗探討高能量電子束銲接中，受到高能量電子束聚焦效應的影響所產生的焊接瑕疵。主要針對了焊接焦點位置變化時對熔區的形狀、銲道深度、焊道寬度、表面粗糙度、鋸齒縱深等等諸元的影響，以及銲深及銲寬的相對關係，並驗證數學模型，以實驗所得的數據來修正理論上所得到分佈情形。其中鋸齒縱深乃是從融區平均深度劇然增加的深度，是在冷卻過程中流體無法及時填補，而在底部產生氣孔與未完整之接合；粗糙表面經常引起成分偏析，氣孔與其他微結構焊接瑕疵，降低了接合性質及強度。本研究因此探討能量聚焦效應對鋸齒縱深與粗糙表面的影響。

The present work researches influence of energy focusing effect to the fusion zone defects in the electron beam welding, which include fusion zone shape, welding depth, welding width, rippling and spiking. And to verify the model of welding defects base on theory and experiment. A spike is a sudden increase in penetration beyond what might be called the average penetration line. Many spikes have voids and cold shuts in their lower portions, because molten metal does not fill in completely, producing a condition similar to a cold shut in a casting. Ripples on a workpiece surface are generally associated with segregation, porosity and other microstructure defects. These become the objectives in this project.

目　錄

摘要…………………………………………………………………Ⅰ
英文摘要……………………………………………………………Ⅱ
謝誌…………………………………………………………………Ⅲ
目錄…………………………………………………………………Ⅳ
圖目錄………………………………………………………………Ⅵ
符號說明……………………………………………………………Ⅷ
第一章 　緒論 ………………………………………………………1
1-1 前言 ……………………………………………………1
1-2 本文架構 ………………………………………………6
第二章　理論分析 …………………………………………………7
2-1 滲透深度 ………………………………………………7
2-1.1焊接模型與假設 ………………………………7
2-1.2焊接模型的建立 ………………………………8
2-1.3焦點變化的修正 ………………………………10
2-2 焊接固化表面粗糙波紋 ………………………………12
2-3 鋸齒縱深 ………………………………………………14
第三章　實驗方法與結果 …………………………………………16
3-1實驗儀器………………………………………………16
3-2實驗步驟………………………………………………17
3-3實驗結果………………………………………………22
3-3.1滲透深度………………………………………22
3-3.1.1 真空度的影響 ……………………25
3-3.1.2焊道形狀 …………………………26
3-3.2焊接固化表面粗糙波紋………………………27
3-3.3鋸齒縱深………………………………………32
第四章　結果與討論………………………………………………34
第五章　結論………………………………………………………41
參考文獻……………………………………………………………43
附錄…………………………………………………………………49

參考文獻

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