アーク溶接過程における鉄溶接金属の酸素吸収について Ｉ Ａｒ‐Ｏ２ふん囲気における鉄溶接金属の酸素吸収について

Abstract

Pure iron was welded in a controlled arc atmosphere. Effects of the welding conditions and the oxygen partial pressure in Ar-O2 welding atmosphere on the oxygen content of iron weld metal were systematically studied.The results are summarized as follows:1. The temperature of iron molten pool is measured by using a thermocouple. According to the result, the temperature is suggested to be above 1600°C-1680°C.2. The oxygen content of iron weld metal decreases with increasing welding current and increases with increasing arc voltage (PO2=0.03 atm).3. The oxygen content of iron weld metal increases with increasing of partial pressure of oxygen under low partial pressure of oxygen in Ar-O2 welding atmosphere. However the oxygen content becomes a constant value of about 0.24 wt.% under high partial pressure of oxygen.4. The oxygen content of weld metal is higher under electrode negative (DCRP) condition than under electrode positive (DCSP) condition.5. Behaviour of oxygen absorption into iron weld metal is discussed by using equilibrium data.