電阻點銲是汽車產業常應用的銲接技術，其品質的好壞，則是依賴銲接實務上的經驗作為設計的依據，這是因為電阻銲接的影響參數太多，以致理論分析上較困難，而理論模擬分析方法的發展，對於銲接參數探討居多，至於銲接品質則少有探討，而在本文中，可以經由飛濺現象的分析以得知銲接品質的好壞。

　　本研究應用有限元素分析法，依據彈性力學、電學及熱傳學理論，探討電阻點銲過程中，外加壓力、電流與溫度場三者間的相互影響關係。模擬方法為結構與電-熱耦合場的間接結合分析，因此，接觸電阻為一個與時間有關的動態電阻，且分析過程中，可觀察出是否有飛濺之現象，進而了解銲接品質的好壞。分析內容包含熱傳邊界、材料性質、外加負載、幾何外形等各參數與銲點大小關係探討。最後針對如何預防飛濺問題及如何控制銲接品質加以討論，並對影響銲接品質的各參數，以系統化整理作為結論。

　The resistance spot welding has been extensively used in the in the automobile industry. Since if involves many parameters that affect the welding quality, a good weld depends on the work experience rather than on the theoretical approach.

　In this paper, we use the finite element method to simulate the welding process. The welding process is divided into several time steps. Each step includes the thermal-structure coupled analysis and thermal-electrical coupled analysis. There fore the contact area, the temperature distribution and electrical field can be obtained at each time step. The influence parameters discussed in the paper are heart transfer conditions on the boundary surfaces, the loading exerted by the electrode, the electrode geometry, the electric contact conductance (ECC), the material properties depending on the temperature, etc. From the results, the size of the nugget and the expulsion phenomenon are predicted and observed numerically.

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