臺灣博碩士論文加值系統

本研究探討鎢極氬弧焊焊接7075鋁合金時，施加不同焊接條件和振動頻率製程條件，對焊件熱裂敏感性試驗影響作測試。焊接時施以不同焊速、電流和電壓，以及0~65.6赫茲頻率範圍的振動處理焊接中的焊件，實驗調查使用Houldcroft測試方法，探討7075鋁合金材料焊件熱裂敏感長度、微硬度、電導率，再和7075鋁合金材料利用穿透式電子顯微鏡(TEM)、掃描式電子顯微鏡(SEM)等特性測試進行比較分析。
另外，也藉由Houldcroft測試來模擬焊接熱影響區，並比較不同焊接條件的熱延性行為以及焊接熱裂敏感性；又透過光學顯微鏡(OM)、穿透式電子顯微鏡(TEM)、掃描式電子顯微鏡(SEM)的觀察、成份分析(EDS)和拉伸強硬度(Tensile test)，及前面的焊裂性試驗等方法來進行分析比較。以及探討焊接熱循環對7075鋁合金材料熱影響區顯微組織的變化與機械性質的影響。

This study explores the influence of different welding conditions and vibration frequency process conditions on welding 7075 aluminum alloy by argon tungsten arc welding to test the influence of weldment thermal cracking sensitivity test. During welding, different welding speeds, currents and voltages, as well as vibration treatments in the frequency range of 0 to 65.6 Hz, were applied to the welding parts. The experimental investigation used the Houldcroft test method to explore the sensitive length, microhardness, and thermal cracking length of 7075 aluminum alloy weldments. The electrical conductivity is compared and analyzed with 7075 aluminum alloy material using transmission electron microscope (TEM), scanning electron microscope (SEM) and other characteristic tests. In addition, the Houldcroft test is also used to simulate the welding heat-affected zone, and the hot ductility behavior and welding hot crack sensitivity of different welding conditions are compared; and through the optical microscope (OM), the transmission electron microscope (TEM), and the scanning electron Microscope (SEM) observation, EDS component analysis and tensile strength test (Tensile test), and the previous welding crack test methods for analysis and comparison. And discuss the influence of welding thermal cycle on the microstructure and mechanical properties of the heat-affected zone of 7075 aluminum alloy.

中文摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 VII
第一章　前言 1
第二章　文獻回顧 6
2.1　7075系鋁合金之析出強化 6
2.1.1　時效析出序列 6
2.1.2　時效硬化機構 10
2.2　再結晶與分散粒子 12
2.2.1　再結晶的機構 12
2.2.2　分散粒子對再結晶的影響 13
2.2.3　再結晶對分散粒子整合性的影響 14
2.2.4　影響分散粒子分佈之因素 16
2.2.5　細晶強化 17
2.3　氫致破裂機構 18
2.4　鋁合金焊接特性 22
2.4.1　焊道組織 22
2.4.2　熱影響區(HAZ)組織 26
第三章　實驗方法與步驟 27
3.1　材料規格與準備 27
3.2　熱處理 28
3.3　Houldcroft焊接熱裂敏感性測試 29
3.4　焊接加工 30
3-5　材料導電率 32
3.6　機械性質測試 32
3.7　顯微組織觀察與分析 34
3.8　實驗程序 36
第四章　結果與討論 37
4.1　焊接條件影響 37
4.2　顯微組織 39
4.3　硬度分布 40
4.4　裂縫觀察 42
4-5　熔池顯微組織 46
4-6　導電度測試 48
4-7　溶解區的裂縫觀察 49
第五章　結論 52
參考文獻 54

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