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研究生: 謝欣涵
Hsin-Han Hsieh
論文名稱: 不銹鋼薄板應用脈衝式雷射銲接之數值分析
Numerical analysis of stainless steel welding with pulsed laser
指導教授: 屠名正
Twu, Ming-Jenq
鄭慶民
Cheng, Ching-Min
學位類別: 碩士
Master
系所名稱: 工業教育學系
Department of Industrial Education
論文出版年: 2008
畢業學年度: 96
語文別: 中文
論文頁數: 83
中文關鍵詞: 雷射銲接有限元素法數值分析溫度場角變形不銹鋼
英文關鍵詞: Laser welding, Finite element, Numerical analysis, Temperature field, Angular distortion, Stainless steel
論文種類: 學術論文
相關次數: 點閱:337下載:30
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  • 本研究以數值分析方法模擬對接薄板雷射銲接之過程,並以實驗所得量測結果對照作驗證。主要係探討溫度場與應力場的變化情形,銲接材料為SUS 304不銹鋼,方法為Nd:YAG雷射銲接。數值模擬採用有限元素分析軟體ANSYS,考慮非線性材料特性且利用熱-力結構耦合分析過程。實驗使用熱電偶量測溫度循環曲線,再以游標高度規測量銲後角變形。
    分析結果顯示,在溫度場分析中,薄板雷射銲接僅需施加高斯柱狀體熱源且利用銲接峰值功率計算出的脈衝時間,能精準的模擬出溫度分佈。在應力場分析中,因銲接熱源的高溫作用使銲道附近有較高的溫度梯度存在,且受到遠離銲道熱源周圍材料的拘束,因而產生較高的壓縮熱應力。隨銲接熱源的消失,靠近銲道附近區域受到冷卻而收縮,故產生較高的拉伸殘留應力。
    對照數值模擬分析結果與實驗量測數據,顯示出本研究的有限元素分析可準確的模擬不銹鋼薄板雷射銲接過程。

    This study simulates the laser welding process for butt joint of sheet metal verified by experiments. It aims at to investigate the changes of the temperature and stress field. The method of welding process is Nd: YAG laser welding with SUS 304 stainless steel as welding material. The finite element software Ansys is used for numerical simulation, which employs thermo-mechanical coupling process with consideration on non-linear material characteristics. The experiments measure the thermal cycle temperature in the welding process with thermocouple and the angular distortion with vernier height gage.
    The analysis results show that to accurately simulate the temperature distribution in the laser welding for sheet metal it only requires to apply the Gauss cylinder volume heat source with pulse time figured out from peak power. The temperature fields adjacent to the heat source are rather steep because of the locally concentrated heat source. The transient thermal stresses are in compressive state since the expansions of these regions are restrained by surrounding cold metal that is at lower temperatures. As the heat source had passed by, the fusion zones have been cooled and hence have a tendency of contraction. A great tensile residual stress was produced in solidified welds, and then rapidly decreased over the area which is far away from welded zone.
    Compare experimental data with results from simulation, it shows that the finite element analysis of this study can accurately simulate the laser welding process for butt joint of sheet metal.

    誌 謝 I 摘 要 II Abstract III 目 錄 IV 表目錄 VII 圖目錄 VIII 第一章 緒論 1 1.1 研究背景 1 1.2 研究動機 2 1.3 研究目的 3 第二章 文獻探討 4 2.1不銹鋼之特性與分類 4 2.1.1 SUS 304 不銹鋼分類 4 2.1.2 SUS 304 不銹鋼的銲接特性 5 2.2銲接溫度場研究發展 6 2.3銲接變形研究發展 9 2.4銲接應力應變研究發展 11 2.5銲接變形 14 2.6銲接殘留應力 15 2.6.1 銲接殘留應力簡介 15 2.6.2 銲接殘留應力之形成 16 2.7材料特性對銲件變形與殘留應力的影響 18 2.8銲接過程之理論分析 19 2.8.1 熱學模式分析 20 2.8.2 力學模式分析 24 2.8.3 銲接過程之耦合分析 25 2.8.4 熱源分佈之選擇 26 2.9銲接過程之非線性分析 27 2.9.1 幾何非線性 27 2.9.2 材料非線性 27 2.9.3 狀態非線性 27 第三章 分析與實驗之方法 29 3.1 幾何尺寸與材料特性 29 3.2 熱量輸入條件 31 3.3 分析假設條件 31 3.3.1 模型假設 31 3.3.2 材料特性 31 3.3.3 初始條件與邊界條件 32 3.4 分析模型 33 3.4.1 網格劃分 33 3.4.2 元素類型 34 3.5 熱源模型 36 3.5.1 面熱源:高斯熱源分佈 36 3.5.2 體熱源:高斯柱狀熱源分佈 37 3.5.3 組合熱源 38 3.6 實驗方法 39 3.6.1 實驗材料與設備 39 3.6.2 銲接實驗 42 第四章 結果與討論 44 4.1 銲接溫度場 44 4.1.1 銲接熱源選取 44 4.1.2 溫度場分佈 46 4.1.3 縱向銲接熱循環 50 4.1.4 橫向銲接熱循環 51 4.2 銲接變形 55 4.2.1 角變形 58 4.2.2 縱向變形 60 4.3 銲接應力場 64 4.3.1 暫態熱應力分析 65 4.3.2 暫態熱應力分析 66 4.3.3 殘留熱應力分析 66 4.3.4 殘留熱應力分析 68 4.3.5 縱向應力分析 70 4.3.6 橫向應力分析 72 第五章 結論與建議 74 5.1 結論 74 5.2 建議 75 參考文獻 76

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