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| 題名: | MIG、LASER與其複合銲接鋁合金 機械性質與疲勞強度分析;Mechanical Properties and Fatigue Strength Analysis of Aluminum Alloys Welded by MIG, Laser, and Hybrid Welding Processes |
| 作者: | 廖庭毅;Liao, Ting-Yi |
| 貢獻者: | 機械工程學系 |
| 關鍵詞: | 鋁合金;MIG銲接;雷射銲接;複合銲接;疲勞壽命;Aluminium;Gas Metal Arc Welding;Laser Welding;Hybrid Welding;Fatigue Life |
| 日期: | 2025-11-14 |
| 上傳時間: | 2026-03-06 19:00:30 (UTC+8) |
| 出版者: | 國立中央大學 |
| 摘要: | 本研究以將分兩大部分介紹，第一部分為使用三種不同銲接方式對AA6061-T6滾軋板進行模擬和拉伸強度的比較; 第二部分為使用MIG銲接對A6061-T6擠型板/ 滾軋板、AA6082-T6擠型板、A356.2-T6鑄造板為實驗材料，觀察其對接結果並進行分析。
第一部分研究顯示在不同的銲接方式中，在MIG銲接中較高的熱輸入量對使銲道區域最寬，熱影響範圍最大機械性質變化也最大，銲絲的填入雖能提升拉伸強度，但較高的熱輸入及較慢的冷卻速度使其拉伸強度變化較大，雷射銲接的低熱輸入量熱影響範圍最小，隨無銲絲的填入，拉伸強度因低熱輸入的高冷卻速率變化較小，在複合銲接中，透過雷射預熱，再由MIG進行銲接能使銲接速度加快，機械性質有銲絲的填入，對於拉伸強度有一定幫助，也使其熱輸入量控制在MIG與雷射之間，速度相比純MIG有大幅提升。
銲接在拉伸試驗以及疲勞試驗中，測試結果對應到母材本身的強度，但經過銲接的影響 ，以及缺陷的產生，在6061-T6擠型板中缺陷影響較少表現較穩定，拉伸強度為187.1MPa疲勞強度有43.04MPa，在6082-T6擠型板中銲接的融合度較低拉伸試驗穩定，拉伸強度為191.2MPa但在疲勞試驗中斷面缺陷影響很大使其疲勞強度僅有28.74MPa，在A356.2鑄造板中母材的缺陷與銲接的缺陷都影響其拉伸強度與疲勞強度，氣孔缺陷影響最大，拉伸強度為183.3MPa疲勞強度僅27.26MPa。
異質銲接中，其拉伸強度與疲勞強度都對應到其母材強度，其材料對應強度皆能反映到銲接後的結果，但經過銲接的處理，以及材料、銲絲、銲接參數的適合度，6061-T6比6082-T6與A356.2-T6鑄造板與銲接適合度較佳，在6082-T6擠型板與A356.2-T6鑄造板當中較容易產生銲接缺陷並影響結果。;This study is divided into two main sections. The first section focuses on the simulation and tensile strength comparison of AA6061-T6 rolled plates joined by three different welding methods. The second section investigates experimental results using MIG welding on various base materials, including AA6061-T6 extruded and rolled plates, AA6082-T6 extruded plates, and A356.2-T6 cast plates, to analyze the characteristics of their butt joints.
In the first part, among the three welding processes, MIG welding exhibited the widest weld zone and the largest heat-affected region due to its relatively high heat input. The addition of filler metal improved the tensile strength; however, the higher heat input and slower cooling rate led to larger variations in mechanical properties. In contrast, laser welding, characterized by low heat input, resulted in a minimal heat-affected zone and limited variation in tensile strength owing to its high cooling rate and absence of filler wire. For hybrid laser-MIG welding, the laser preheating followed by MIG welding increased the welding speed and provided moderate heat input—between that of MIG and laser welding. The use of filler metal contributed to improved tensile properties while significantly enhancing welding speed compared with conventional MIG.
The tensile and fatigue test results corresponded closely to the strength of the base materials. However, welding-induced thermal effects and defects influenced the mechanical performance to varying degrees. The AA6061-T6 extruded plate showed the most stable results, with fewer weld defects, achieving a tensile strength of 187.1 MPa and a fatigue strength of 43.04 MPa. The AA6082-T6 extruded plate exhibited good tensile performance (191.2 MPa) but a lower fatigue strength (28.74 MPa) due to interfacial defects in the weld zone. The A356.2 cast plate was strongly affected by both casting and welding defects, particularly porosity, resulting in a tensile strength of 183.3 MPa and a fatigue strength of only 27.26 MPa.
In dissimilar welds, the tensile and fatigue strengths were found to correspond to those of the respective base materials. Nevertheless, the compatibility between materials, filler wire, and welding parameters significantly affected the results. Among the tested materials, AA6061-T6 exhibited better compatibility with the welding process compared with AA6082-T6 and A356.2-T6. In contrast, the latter two materials were more prone to welding defects, which substantially influenced their overall mechanical performance. |
| 顯示於類別: | [機械工程研究所] 博碩士論文
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