本研究係使用直徑6 mm之碳化鎢圓棒作為銲接工具，在高轉速定負荷條件下對薄鍍鋅鋼板進行摩擦攪拌搭接，搭接後進行剪切拉伸試驗以測量破壞負荷，瞭解接合過程之銲接機制。在擠壓負荷(150~500 N)、主軸轉速(3000~24000 rpm)、銲接時間(5~30 sec)及進給速度(0.5~2 mm/sec)等實驗參數下，從銲道表面輪廓、溫度變化、破壞負荷與下陷深度等結果，探討薄鍍鋅鋼板之接合特性。以主軸轉速18000 rpm、擠壓負荷300 N及銲接時間20 sec之條件下進行摩擦攪搭接，結果顯示鍍鋅鋼板拉剪強度較高，約為冷軋鋼板的1.8倍。根據點銲搭接實驗之結果，發現擠壓負荷(Fd)、主軸轉速(Ns)與進給速度(f)均會影響搭接後的破壞負荷(F_f)，將其量化後求出經驗公式為F_f=0.0302∙〖F_d〗_^0.8289∙〖N_s〗_^0.6312∙f^(-0.43) ，結果顯示破壞負荷與擠壓負荷及主軸轉速乘積成正相關，而與進給速度成負相關，其中擠壓負荷對銲道之破壞負荷比主軸轉速影響的程度較大。

In this study, a pinless tool made of tungsten carbide rod with 6 mm in diameter is used as the welding tool at high rotating speed and constant downward load conditions to conduct the friction stir lap welding (FSLW) for thin galvanized steel sheets. To understand the lap mechanism, a shear tensile test is conducted to measure the fracture load after welding. The lap mechanism and characteristics of thin galvanized steel sheets, in terms of weld surface profile, interface temperature, failure load, and plunge depth, were investigated under different operation conditions, such as the downward load (150~500 N), the rotating speed (3000~24000 rpm), the dwell time (5~30 sec) and the feeding rate (0.5~2 mm/sec). Under a rotating speed 18000 rpm, a downward load of 300 N and a dwell time of 20 sec, the shear strength for the galvanized steel is about 1.8 times as strong as the cold rolling steel. Experimental results show that the failure load is significantly influenced by the downward load, the rotating speed, and the feeding rate. An empirical equation of failure load (F_f) suitable for the thin galvanized steel sheets of the FSLW process is derived in terms of load (〖F_d〗^ ), rotating speed (〖N_s〗^ ), feeding speed (f^ ) as F_f=0.0302∙〖F_d〗_^0.8289∙〖N_s〗_^0.6312∙f^(-0.43). This formula indicates that F_f is proportional to the product of〖 F〗_d and N_s, but inversely proportional to 〖 f〗^ . Moreover, the influence of downward load on the failure load is greater than that of rotating speed.

審訂書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 xi
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.2.1 碳鋼材料 2
1.2.2 鍍鋅鋼 7
1.3 研究目的 10
第二章 實驗設備與實驗方法 11
2.1 摩擦攪拌銲接設備 11
2.1.1 高速主軸模組 12
2.1.2 進給模組 13
2.1.3 氣壓模組 13
2.2 交界溫度量測 15
2.3 平均熱暈寬度量測 15
2.4 表面粗糙度與銲道下陷深度量測 16
2.5 拉剪破壞試驗 17
2.6 實驗試片 18
2.6.1 實驗試片材料特性 18
2.6.2 實驗試片幾何形狀 19
2.7 銲接工具 19
2.7.1 銲接工具材料特性 19
2.7.2 銲接工具幾何形狀 20
2.8 實驗治具設計與材料 20
2.9 實驗方法 22
2.9.1 實驗前處理 22
2.9.2 實驗參數規劃 22
2.9.3 銲接位置 23
2.9.4 實驗步驟 23
2.10 實驗流程 25
第三章 結果與討論 26
3.1 點銲搭接實驗 26
3.1.1 時間影響 27
3.1.2 擠壓負荷影響 31
3.1.3 主軸轉速影響 36
3.1.4 主軸轉速與擠壓負荷對試片表面溫度之影響 41
3.2 進給銲接實驗 42
3.2.1 擠壓負荷與進給速度之影響 43
3.2.2 主軸轉速與進給速度之影響 47
3.2.3 主軸轉速、擠壓負荷與進給速度對銲道破壞負荷之影響 51
3.3 破斷面觀察及分析 53
3.3.1 SGCC破斷面Mapping觀察 53
3.3.2 SPCC與SGCC破斷面分析 56
3.4 SGCC接合剖面之元素分析 58
第四章 結論與未來展望 61
4.1 結論 61
4.2 未來展望 61
參考文獻 62

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