金屬惰性氣體 (MIG) 和鎢極惰性氣體 (TIG) 銲接是工業上最受重視的銲接技術，TIG 銲接擁有銲渣噴濺少與提供較低的熱輸入的特性，產生之熱影響區亦較小而獲得良好的銲道機械性能，但只適合用於薄材料的銲接。當銲接較厚的工件時，MIG 銲接是大多數工業上的首選方法，無需完全加熱欲接合之零件即可在接合處局部熔化形成熔池，並將電極金屬填料與零件熔合在一起，從而得到接合；此外在熔合過程中採用金屬填料，也適合各種異種金屬之施銲。本研究回顧了TIG與MIG銲接改進的相關研究資料後，提供給作者一種複合銲接的研究想法；因此本研究採用了一種結合 TIG 與 MIG 的銲接方法，針對 AA5083 鋁合金進行同步複合銲接，銲接參數採用不同熱輸入量製作開槽與不開槽之對接接合銲接，觀察銲接後熔融區、熱影響區及母材顯微組織變化，並探討微硬度分佈與拉伸強度變化情形。實驗結果顯示，複合銲接所造成的熱影響區較小且銲道晶粒有較細化之現象，有開槽的銲件其硬度與抗拉強度均高於無開槽的銲件，其原因主要是有開槽的銲道中其細晶粒佔的比例較高有關，最後綜合研究發現複合銲接能夠優化微觀結構並能夠實現高品質銲接，得到優良的機械性質。

Metal Inert Gas (MIG) and Tungsten Inert Gas (TIG) welding are the most popular welding technique used in the industry. TIG welding rarely creates spatter and provides a lower heat input results in smaller heat affected zones, directly increases the mechanical properties of the welded joint, however is suited to join thin materials. When it comes to thicker materials, MIG welding is preferred. Thicker parts can be melted without the need to heat them up completely, since electrode provides necessary filler for filling root gap. Additionally, because it uses fill instead of fusion, MIG welding can be used to join two dissimilar materials. Review on the research progress related to the improvement of TIG and MIG weldments were investigated separately and gave an idea to the author to think about a hybrid welding method that ran synchronized in the welding process. This paper described a hybrid welding procedures combining TIG and MIG welding methods to join 5083 aluminum alloy. Welded joints were made with different values of heat input and groove configurations. The results of metallographic research of welded joints, microstructures of the fusion zone, heat affected zone and base metal, hardness distribution and tensile strength were presented. The results revealed that the heat affected zones of the hybrid welds were relatively narrow and fine grained of weld metal. The hardness and tensile strength of the groove samples were higher than the no groove sample. The reason was mainly related to the higher volume ratio of fine grained in the weld metal for the groove sample. Finally, due to the improvement in the microstructural properties of hybrid welding processes were achieved quality weld joint with enhanced mechanical properties.

摘要.....i
Abstract.....ii
誌謝.....iii
目錄.....iv
表目錄.....vii
圖目錄.....viii
第一章 緒論.....1
1.1前言.....1
1.2研究動機.....1
第二章 文獻回顧.....3
2.1鋁及鋁合金特性.....3
2.2鋁合金分類.....3
2.3 鋁合金材料與銲接.....9
2.3.1 5083鋁合金 .....9
2.3.2 鋁合金銲接特性.....9
2.4鋁合金銲接組織特性.....10
2.4.1熔池邊界磊晶成長.....10
2.4.2競爭性成長.....11
2.4.3銲道中心等軸晶成長[22].....11
2.4.4銲接金屬的機械性質.....13
2.4.5熱影響區的機械性質.....13
2.5鋁合金銲接缺陷.....15
2.5.1氣孔.....15
2.5.2變形.....16
2.5.3熔融熔穿不良.....16
2.5.4夾渣.....17
2.5.5裂縫.....17
2.6 惰性氣體鎢極銲.....20
2.6.1 惰性氣體鎢極電弧銲原理.....20
2.6.2 惰性氣體鎢極電弧銲接電流及特性.....21
2.6.3 惰性氣體鎢極電弧銲接的參數特性.....24
2.6.4 惰性氣體鎢極電弧銲接之優缺點[17,33,34].....24
2.7 惰性氣體金屬極電弧銲接.....25
2.7.1 惰性氣體金屬極電弧銲接原理.....25
2.7.2 銲線金屬轉換模式[18].....27
2.7.3 惰性氣體金屬極電弧銲接之主要銲接參數.....27
2.7.4 鋁合金銲材.....28
2.7.5 惰性氣體金屬極電弧銲接之優缺點[39].....33
2.8國內外相關研究.....33
第三章 實驗方法.....37
3.1實驗流程.....37
3.2實驗材料準備.....38
3.3實驗銲接設備.....40
3.4顯微組織分析.....42
3.5維式硬度分析.....42
3.6拉伸試驗.....44
3.7 X光繞射分析.....45
3.8 SEM/EDS觀察與分析.....46
第四章 實驗結果.....47
4.1銲接參數對銲道成形之影響.....47
4.1.1銲接走速之分析.....47
4.1.2銲接電流之分析.....48
4.1.3銲接電壓之分析.....49
4.1.4各銲接參數整理.....50
4.1.5鋁合金銲件截面分析.....52
4.2金相顯微組織分析.....52
4.2.1鋁合金母材金相顯微組織分析.....54
4.2.2鋁合金銲道金相顯微組織分析.....54
4.3XRD繞射分析.....59
4.3 SEM/EDS元素分析.....60
4.5維式硬度分析.....79
4.6拉伸試驗.....82
4.6.1拉伸性質分析.....82
4.6.2拉伸破斷面分析.....84
第五章 結論.....88
參考文獻.....88
Extended Abstract.....92

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