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論文名稱 Title |
高能量束銲接所產生熔區底部鋸齒狀縱深研究 Spiking Phenomenon in High Intensity Beam Welding |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
65 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2000-06-30 |
繳交日期 Date of Submission |
2000-07-04 |
關鍵字 Keywords |
孔穴、鋸齒狀縱深、聚焦位置、高能量束銲接 Spiking, High-intensity beam welding, cavity, focal location |
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統計 Statistics |
本論文已被瀏覽 5658 次,被下載 6299 次 The thesis/dissertation has been browsed 5658 times, has been downloaded 6299 times. |
中文摘要 |
本研究探討高能量電子或雷射束銲接過程·入射能量造成工作接合區底部鋸齒狀縱深發生之原因·鋸齒狀縱深乃是相對於熔區平均深度所突然增加之底部縱深·熔液因不能及時填入鋸齒狀根部﹐因而極易產生氣孔·縱使熔液能夠填入鋸齒狀根部﹐快速之冷卻使熔液不及與壁完全結合﹐而產生如鑄造過之冷隙現象·此類銲件瑕疵嚴重造成接合品質之欠佳·高能量束銲接所產生之空穴﹐因入射能量鏡面反射強烈影響熔區底部之能量吸收﹐因此探討能量束特性對週期性鋸齒狀縱深之效應極為重要·此外﹐當入射能量之焦距與空穴底部深度呈相對振盪﹐熔區底部承受入射能量之區域﹐瞬間由最寬至零﹐反之亦然﹐熔區底部之能量吸收因而產生數百倍之變化﹐造成極明顯之週期熔化·本實驗因此考慮吸收能量與能量焦點之關係﹐結合輸送現象理論﹐建立模式﹐以預測週期性鋸齒狀縱深發生之原因·理論結果將與實驗相印証. |
Abstract |
Spiking representing a periodic melting and solidification in the depth of fusion zone during high-intensity beam welding is experimentally and theorectically investigated in this work . A spike is a sudden increase in penetration beyond what might be called the average penetration line. Many spikes have voids in their lower portions because molten metal does not fuse to the sides of the hole, producing a condition similar to a cold shut in a casting. These defects seriously reduce the strength of the joint. Due to the significant role of specular reflection on absorption, an investigation of the beam characteristics, especially the focal location, on spiking is important. Furthermore, as the cavity base oscillates upward and downward relatively from the focal location, a central region subject to direct irradiation changes instantaneously from maximum to zero and vice versa. This leads to several hundred time difference in energy absorption and strongly periodic melting at the cavity base. Physical phenomenon of spiking is obtained by comparing between the measured and predicted data based on scale anlaysis of transport process near the cavity base and energy absorption as a function of focal location. |
目次 Table of Contents |
一、 前言------------------------------------------------------------------------2 二、 實驗方法------------------------------------------------------------------7 1、 實驗儀器--------------------------------------------------------------7 2、 實驗步驟--------------------------------------------------------------8 3、 實驗結果-------------------------------------------------------------13 三、 理論分析-----------------------------------------------------------------38 四、 結果與討論--------------------------------------------------------------46 五、 參考資料-----------------------------------------------------------------47 |
參考文獻 References |
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