系統識別號 U0026-0812200911371854
論文名稱(中文) Nd-YAG雷射銲接製程參數對鎳基690與304L不銹鋼異種銲接之影響
論文名稱(英文) The Influence of Nd-YAG Laser Welding Parameters on Dissimilar Welding of Alloy 690 and 304L Stainless Steel
校院名稱 成功大學
系所名稱(中) 機械工程學系碩博士班
系所名稱(英) Department of Mechanical Engineering
學年度 93
學期 2
出版年 94
研究生(中文) 范文傑
研究生(英文) Wen-Chieh Fan
學號 n1691458
學位類別 碩士
語文別 中文
論文頁數 95頁
口試委員 口試委員-蘇演良
中文關鍵字 異種金屬對接銲  304L  690合金  Nd:YAG  脈衝波  連續波 
英文關鍵字 Nd:YAG  pulse wave  continuous wave  nickel-based Alloy 690  SUS 304L  dissimilar welding 
中文摘要   本研究在探討相同平均輸出功率下,不同雷射功率輸出波型—脈衝波(pulse wave:PW)形式及連續波 (continuous wave:CW)形式,對厚度3mm之鎳基690合金與304L不銹鋼異材對接銲件之影響。以Nd:YAG高功率雷射,矩形波為基本輸出波型,設定三組平均輸出功率(1750W、1500W、1250W)進行實驗。
  由銲道成份分析中發現,CW銲件因690合金溶入較304L多而呈現高Ni低Fe;PW銲件則偏向兩母材各溶入一半,呈現高Fe低Ni。 Modified Huey test 腐蝕試驗之結果,可觀察到全部銲件的抗沿晶腐蝕(IGC)能力均十分優良,僅出現次晶晶界及次晶間孔蝕。CW銲件之高Ni低Fe使得抗次晶晶界浸蝕能力較PW銲件為佳,而隨著平均輸出功率的降低,由於PW銲件之入熱量較CW銲件低,使得PW銲件具有較佳之抗次晶間孔蝕能力。
英文摘要   This study investigates the effects of different laser wave modes (the pulse wave: PW and continuous wave: CW) on dissimilar weldments of 3 mm nickel-based Alloy 690 and SUS 304L under the same identical mean power. By using Nd:YAG laser with rectangular wave shape for the basic wave shape and set 3 groups of identical mean powers(1750W, 1500W, 1250W) in the experiment.
  First, the bead-on-plate test is used to examine the critical welding speed for full penetration. It shows that PW can achieve higher critical welding speed than CW. Then, the appropriate welding speed was selected to proceed with butt welding.
  From the results of butt welding, the heat input of PW weldments is lower than that of CW weldments due to higher welding speed. However from the results of microstructure and mechanical properties analyses, the subgrain structure, size and mechanical properties of all weldments fusion zone have not distinguished significantly. The microstructure of fusion zone is mainly the cellular with a small amount of columnar dendrite. The microhardness of fusion zone is between 160Hv0.2~170Hv0.2 and the tensile strength is between 560MPa ~ 580MPa.
  According to the composition analysis, the CW weldments have higher Ni content than Fe resulted from more Alloy 690 melted than 304L; On the other hand, the melt of PW weldments tends to have the same content of Alloy 690 and 304L with higher Fe content than Ni. Based on the result of Modified Huey test, all the specimens have very good resistance to intergranular corrosion with just a little sub-grain boundary and interdendritic pitting corrosion. The property of high Ni low Fe of CW weldments enable themselves to have the better resistance to sub-grain boundary corrosion, nevertheless, by reducing the mean power output, due to the heat input of PW weldments is lower than that of CW weldments, PW weldments have the better resistance to interdendritic pitting corrosion.
論文目次 總目錄

授權書 Ⅰ
口試合格證書 Ⅱ
中文摘要 Ⅲ
英文摘要 Ⅳ
誌謝 Ⅵ
總目錄 Ⅶ
表目錄 Ⅸ
圖目錄 Ⅹ
第一章、前言 1
第二章、文獻回顧 3
第三章、理論說明 7
3-1 雷射銲接 7
3-1-1 雷射產生基本要素 7
3-1-2 雷射銲接特性 8
3-1-3 雷射銲接參數之影響 9
3-2 銲接凝固理論 14
3-2-1 組成過冷 14
3-2-2 凝固模式 15
3-2-3 影響次晶結構組織大小的因子 17
3-2-4 快速凝固對微觀偏析之影響 17
3-3 異種金屬銲接 21
3-3-1 銲接材料介紹 21
第四章、實驗規劃與流程 29
4-1 實驗規劃 29
4-2 實驗流程 29
4-2-1 實驗材料及製備 29
4-2-2 走銲試驗及對接銲試驗 31
4-2-3 實驗分析 33
4-3 實驗設備 35
第五章、結果與討論 38
5-1 BOP 38
5-1-1 304L與690合金之BOP 38
5-1-2 304L與690合金之BOP比較 40
5-1-3 異種對接銲參數之選擇及銲後巨觀 41
5-2 金相分析 47
5-3 成份分析 54
5-4 機械性質 64
5-4-1 硬度分析 64
5-4-2 拉伸試驗與斷口分析 66
5-5 腐蝕試驗分析 74
第六章、結論 84
第七章、未來方向與建議 86
第八章、參考文獻 87
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