在雙金屬料管的感應加熱製程中，其內孔之合金層易因感應功率、溫度、及持溫時間的選用不當，造成大量孔洞缺陷及硬度不足等問題，損及合金層之瑕疵和孔洞缺陷成因與內徑溫度息息相關，加上料管徑向溫度分佈對合金層品質也有直接影響。本文將以數值模擬的方式來進行感應加熱製程溫度的預測並求得料管之加熱製程操作參數，以提供中鋼製程操作參數，並提升金屬料管感應加熱製程的加熱品質。

　　本文研究利用電磁學、熱傳學等相關學理，建立合適的電磁場與溫度場模擬模型，結合數值分析的方法分析雙金屬料管的感應加熱製程中的溫度場變化。討論三種不同尺寸大小金屬料管分別為Pipe A、Pipe B、Pipe C，並輸入對應的操作條件，所得理論分析結果同時與中鋼公司製程中量測之雙金屬料管的外表面溫度及內表面溫度做比較，以驗證數值模擬分析結果之正確性，然後並討論各種參數如輸入電壓、電流頻率、工件的導磁係數、線圈至加熱工件的距離對加熱溫度的影響。

　　For the induction heating process of bi-metallic tubes, the inner tube of alloy-layer is much easier to cause a lot of defects of cavities and insufficient hardness due to the fact that induction power, temperature value and the time frame of temperature retention were chosen improperly. The defects of the alloy-layer depend on the temperature of inner tube. In addition, the alloy-layer quality is corresponded with the temperature distribution in the radial axis of tubes. The paper predicted the temperature distribution with induction heating process numerically to obtain some related process parameters. Some parameters were tested to increase the heating quality of induction heating process of metallic tubes for China Steel Corporation.

　　The study utilized the theorem of electromagnetics and heat transfer to create a proper simulation model for electric-magnetic and temperature field. The variety for the temperature field with the induction heating process for bi-metallic tubes was analyzed numerically. Three different sizes of metallic tubes with Pipe A, Pipe B, Pipe C were discussed, respectively. Then, the supplied corresponding operation conditions and the numerical results were compared with measured data from China Steel Corporation. Finally, the study discussed the influences for the temperature distribution with different parameters such as the input voltage, current frequency, permeability of work piece and the air gap between coil and the work piece.

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