Abstract
An investigation was made of silicon on the oxygen absorption and deoxidation in Ar-O2 or Ar atmosphere during arc melting process, to elucidate the oxygen absorption mechanism of steel weld metal during arc welding process. In Ar-O2 atmosphere, the amount of oxygen absorbed by Fe-Si alloy far exceeded the oxygen levels calculated from the molten Fe-Si alloys temperatures. After changing the atmosphere Ar-O2 to Ar, the oxygen content of arc melted Fe-Si alloy decreased toward the oxygen levels calculated from the Fe-Si alloys temperatures. The probable interpretation is that excessive amount of oxygen is present in Fe-Si alloy as the oxide due to the incomplete separation of reaction products. It is considered that the results apply to weld metals during arc welding process.
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