銲藥吸濕研究

Study on Moisture Absorption in Welding Fluxes

本研究針對潛弧銲藥中氧化鎂（MgO）的吸濕行為進行探討，氧化鎂成分極易吸附水份或與水反應生成氫氧化鎂（Mg（OH）₂），進而於高溫銲接過程中釋放氫，易導致銲縫氣孔與機械強度下降。本研究聚焦於以二氧化矽（SiO₂）溶液對氧化鎂進行表面改質，透過粉末處理方式降低其吸濕性。實驗流程涵蓋粉末改質、水份測試、XRD、FTIR、含水率測試、SEM分析與銲接測試。結果顯示，經二氧化矽包覆後之氧化鎂具備一定的疏水性，吸濕速率明顯降低，銲縫完整性亦有所提升，證實此方法對改善銲藥吸濕問題具潛在應用價值。

This study investigates the moisture absorption behavior of magnesium oxide (MgO) in submerged arc welding (SAW) flux. Magnesium oxide is highly prone to adsorbing moisture or reacting with water to form magnesium hydroxide (Mg(OH)₂), which can release hydrogen during high-temperature welding and lead to weld porosity and decreased mechanical strength. This research focuses on surface modification of MgO using a silicon dioxide (SiO₂) solution to reduce its hygroscopicity through powder treatment methods. The experimental procedures included powder modification, moisture absorption tests, XRD, FTIR, moisture content analysis, SEM observations, and welding performance evaluation. The results indicate that MgO coated with SiO₂exhibits noticeable hydrophobicity and a significantly reduced moisture absorption rate, leading to improved weld integrity. These findings demonstrate that SiO₂surface modification offers potential applicability in mitigating the moisture absorption issue of welding fluxes.