臺灣博碩士論文加值系統

本研究設計一嶄新之內嵌式銲接工具，以進行對4mm之SS400低碳鋼薄板進行摩擦攪拌單點銲接。為了提升其生成摩擦熱的效率以及增進銲接點銲接品質，銲接工具以直徑20mm碳化鎢圓棒為基礎，在肩部嵌入一塊SS400低碳鋼圓柱形嵌料。銲接設備使用ㄧ具有定負荷銲接平台之立式銑床。銲接時工具與試片間正向負荷為8kN，工具沒有傾角；銲接過程工具擠入深度和銲接界面溫度分別以位移計與熱電偶進行動態量測。

　　以工具轉速900rpm銲接60秒下，使用嵌料直徑5mm和10mm之溫度升高的速率分別是沒有嵌料銲接工具的5.28和6.31倍；以1200rpm銲接則為1.36和1.42倍。而在銲接300秒後，使用嵌料直徑5mm和直徑10mm所到達的最高銲接溫度比沒有嵌料銲接工具升高59℃和412℃；以1200rpm銲接則為35.6℃和197.6℃。在銲接工具轉速銲接60秒下，以轉速900rpm使用嵌料直徑5mm和直徑10mm所得之銲接試片剪切方向破壞負荷分別比沒有嵌料銲接工具高11.3kN和15.5kN，攪拌層厚度也增加2mm和5mm；以轉速1200rpm下使用嵌料直徑5mm和直徑10mm所得之銲接試片剪切方向破壞負荷分別比沒有嵌料銲接工具高7.6kN和18.3kN。

This study aims to design a novel inserted welding tool to friction stir spot weld SS400 low carbon steel sheets of 4mm thickness. In order to enhance the efficiency of frictional heat generation and to enhance the quality of the welding spot, the welding tool based on a cylindrical tungsten carbide and is inserted by a SS400 low carbon cylinder. The welding apparatus composed of a vertical milling machine and a welding platform that can keep the load between tool and workpiece constant. The plunge load is 8kN and there''s no inclination angle on the tools. Welding temperature and the tool plunge depth are measured by thermelcouples and a displacement meter.
　　At the tool rotational speed of spindle of 900rpm and welding for 60 seconds, the temperature rising rate of the tools with 5 mm and 10 mm inserted material are 5.28 times and 6.31 times greater than the one without insert. While they are 1.36 and 1.42 times greater than at 1200rpm.At the tool rotational speed of spindle of 900rpm and welding for 300 seconds, themaximun welding temperature the tools with 5 mm and 10 mm inserted material can reach are 59℃ and 412℃ higher than the one without insert. While they can reach 35.6℃ and 197.6℃ greater than at 1200rpm. According to the tensile test, the shear failure loads of clad steel plates increase 11.3kN and 15.5kN by using tools with 5 mm and 10 mm inserted material at 900rpm for 60 seconds, and increase 7.6kN and 18.3kN by using tools with 5 mm and 10 mm inserted material at 1200rpm.

總 目 錄
論文審定書 i
誌謝 ii
中文摘要 iii
英文摘要 iv
總目錄 v
圖目錄 viii
表目錄 xii
符號說明 xiii
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 4
1.2.1 摩擦攪拌點銲接 4
1.2.2 回填式摩擦攪拌點銲接 7
1.2.3 銲接工具材料選用 11
1.2.4 銲接工具外形設計 15
1.3 研究目的 19
1.4 論文架構 20
第二章 實驗設備與方法 21
2.1 實驗設備 21
2.1.1 定負荷銲接平台 22
2.1.2 位移量測設備 24
2.1.3 溫度量測設備 24
2.1.4 擠入深度、溫度量測系統配線 25
2.2 實驗試片之材料特性與尺寸 26
2.3 銲接工具之設計 27
2.4 背部墊板之材料特性與尺寸 29
2.5 實驗方法 30
2.5.1 實驗參數規劃 30
2.5.2 試片前處理 31
2.5.3 實驗步驟 32
2.5.4 銲接試片放置與銲接位置 34
2.5.5　K-Type熱電偶之放置 35
2.5.6 金相觀察試片準備 36
2.6 實驗流程 37
第三章 實驗結果與討論 38
3.1 溫度、擠入深度動態量測值之探討 38
3.1.1 不同嵌料直徑銲接工具之銲接界面溫度變化 38
3.1.2 擠入深度與銲接介面溫度之關係 43
3.2 銲點表面與橫切面光學觀察 52
3.2.1 不同嵌料直徑銲接工具對銲點外觀之影響 52
3.2.2 不同嵌料直徑銲接工具對塑性流動層厚度之影響 54
3.3 剪切力試驗與破斷面觀察 56
3.3.1 不同嵌料直徑銲接工具對銲點剪切力之影響 56
3.3.2 不同嵌料尺寸銲接試片剪斷面分析 68
第四章 結論與結論與未來之發展 60
4.1 結論 60
4.2 未來之發展 62
參考文獻 63

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