对五种自制焊剂进行了正反极性的埋弧焊接,利用LECO氧分析仪测定熔滴的含氧量.结果表明：直流正接条件下熔滴的含氧量明显高于直流反接,且这一趋势随着熔渣碱度的增大而增大,间接证明了焊接电弧阴极和阳极熔渣/液态金属界面存在冶金电化学作用.进一步分析显示,在焊接参数一定的条件下,熔渣中氧离子浓度是影响熔滴阶段金属电化学增氧的关键因素.

Five different experimental welding fluxes were used in SAW(submerged arc welding) of both positive and negative polarity.Analyses for oxygen content of droplet were carried out using a LECO interstitial analyzer.It was found that oxygen content welded in DCEP was higher than in DCEN,and the trend became obvious when basicity index was enhanced.It was indirectly shown that metallurgical electrochemical reaction occourred at the interface between molten slag and liquid metal in the cathode and anode of welding arc.Further analyses showed that when welded in consistent parametera,oxyanion content of slag was the predominent factor influencing electrochemical oxygen pickup at electrode-tip.