本研究係使用傳統重型立式銑床及可量測軸向負荷的工作台，以高速鋼工具在工具傾角1.5°，工具轉速800、1000 rpm，進給速度分別為45、60、86 mm/min 之條件下，對厚度15 mm 的純銅板進行摩擦攪拌銲接。在固定進給速度情況下，尋找可銲接之工具轉速，討論工具探針之幾何尺寸及下壓方式對探針變形的影響。最終探討進給速度對銲接軸向負荷、銲接溫度及接合強度之影響，並透過微觀結構觀察說明進給速度對銲道機械性質的影響。
　　實驗結果顯示，在單點銲接中，工具轉速800 rpm 條件下的持壓時間需要20秒溫度才能達到850°C，而工具轉速1000 rpm條件下只需持壓10秒溫度即能達到870°C；然而在固定進給速度60 mm/min，工具轉速800 rpm 條件下工具會與試片接合在一起，為不適合銲接之參數，故將工具轉速1000 rpm作為適合銲接參數。此外，在固定進給速度條件下，探討探針幾何尺寸之影響，固定根部直徑提高探針錐度能使探針變形量減少，然而固定探針錐度增加探針根部直徑會則使探針變形量增加；另一方面，對於下壓方式之影響，在試片中預孔能有效降低探針之變形量。由這些結果得知，在探針錐度40°、根部直徑14 mm及預孔條件下，能得到不變形之探針。
　　此外，在進給速度45 ~ 86 mm/min 之條件下所得到的拉伸強度皆能達到母材拉伸強度的90%以上，伸長率亦有母材伸長率的75%以上。另一方面，隨著進給速度提升，試片底部的攪拌會較不均勻，在導向彎曲試驗下會出現較大的裂痕，但深度最大僅有1 mm，對接合強度並不影響。

In this study, 15 mm thick pure copper plates were friction stir welded on condition that tool tilt angle 1.5°, tool rotating speeds of 800 and 1000 rpm and feed speeds of 45, 60, and 86 mm/min using high speed steel tool. Under the condition of constant speed to find weldable tool rotating speed, discuss effects of tool pin geometry size and plunge methods on the pin deformation. Finally, investigate influences of different feed speeds on downward force, temperatures and the joint strength and explain effects of different feed speeds on weld mechanical properties by microstructural observation.
　　Experimental results show that the welding temperature achieved 850°C after dwell time of 20 seconds under tool rotating speed of 800 rpm condition; the welding temperature can achieve 870°C after dwell time of 10 seconds under tool rotating speed of 1000 rpm condition. However, tool bonded with workpieces under tool rotating speed of 800 rpm condition, so the tool rotating speed of 1000 rpm was suitable parameter rather than 800 rpm. In addition, under the condition of constant speed to discuss effects of tool pin geometry size. Fixed the root diameter, the pin deformation can decrease by increasing pin angle; however, fixed the pin angle were making pin deformation increased by increasing pin root diameter. On the other hand, pre-hole in workpieces can effectively decrease pin deformation. The results show that under the condition of pin angle of 40°, root diameter of 14 mm and pre-hole can get non deforming pin.
　　In addition, the tensile strength of various feed speeds can achieve above 90% of base metal tensile strength, the elongations of various feed speeds also can achieve above 75% of base metal elongation. On the other hand, the stir of bottom of workpieces were more non-uniform with feed speed increased, it was appearing larger crack in guided bend test. The maximum depth of crack about 1 mm, it does not affect the joint strength.

論文審定書 i
致謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 xi
第一章 緒論 1
1.1 研究背景 1
1.2 文獻回顧 3
1.2.1 銲接操作參數的影響 3
1.2.2 工具傾斜角對缺陷的影響 4
1.2.3 工具探針錐度的影響 5
1.2.4 純銅摩擦攪拌銲接之特性 6
1.2.5 不同厚度的純銅或銅合金之摩擦攪拌銲接探討 7
1.3 研究目的 17
第二章 實驗設備與方法 19
2.1 實驗設備 19
2.1.1 工作台 20
2.1.2 溫度量測背板 22
2.1.3 摩擦攪拌銲接工具與試片 23
2.2 實驗方法 25
2.3 銲道破壞試驗 28
2.4 金相觀察及微硬度試驗 31
2.5 實驗流程 32
第三章 實驗結果 33
3.1 工具轉速探討 33
3.1.1 單點銲接 33
3.1.2 進給銲接 38
3.2 銲接工具與下壓方式探討 43
3.2.1 探針尺寸對探針變形之影響 43
3.2.2 預孔對探針變形之影響 51
3.3 進給速度對軸向負荷及溫度之影響 59
3.4 進給速度對銲道強度之影響 67
3.5 銲道剖面之金相觀察 71
3.6 微硬度分布 75
3.7 長度300 mm 之長銲道摩擦攪拌進給銲接 76
3.8 長度300 mm 銲接試片之非破壞檢測 78
3.8.1 液體滲透檢測 (Liquid penetrant inspection) 78
3.8.2 射線檢測 (Radiographic inspection) 79
3.8.3 相位陣列式超音波檢測 (Phased array ultrasonic inspection) 80
第四章 結論與未來展望 85
4.1 結論 85
4.2 未來展望 87
參考文獻 88

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