本文研究以電弧銲產生電弧作為固定加熱源使合金鋼受熱熔化的過程,由於流場同時受到浮力、表面張力、電磁力以及電弧摩擦力的影響，為一複雜的對流相變化問題，而如何精確地模擬出液態區的形狀為這類問題的主要目標。本文將採用單區法來處理速度場與壓力場，而液固界面以內差的方式求得，並借重NAPPLE能適用於不規則形狀的邊界以及非交錯網格的優點，使得網格系統為固定且非交錯，大幅度地減低數值模擬時的複雜度，並分別探討自然對流、馬諾哥尼效應、電磁力及摩擦力對熱流場及液固界面的影響，最後模擬出的液固界面再和實驗做比較。

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