被覆剤中の Mn 及び Si の脱酸効果に關する研究(第 3 報) : イルメナイト・砂鐵系被覆剤に及ぼす影響ならびに熔着鋼の性質を左右する二, 三の因子

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The mechanical properties resulting from the deoxidation with ilmenite or iron-sand system flux in wich Mn and Si have been included, were studied. The results follow : 1) Of the components of the mixture, ilmenite gives the best result at 30%. It works with a good result even at 50%. 2) Iron-sand gives a better result when mixed with ilmenite. The mixing ratio was set at iron-sand/ilmenite=20/30,both together making 50 against the total fllux as 100. A very good result was obtained from this ratio. When efficiency in deoxidizing mild steel arc welds is aimed at, the general tendency of some of the factors that affect the quality of mild steel arc welds are : i) That there exists a close relationship between the amounts of C and Mn in mild steel arc welds. An increase of Mn is naturally accompanied by an increase of C. ii) That the quantity of Mn remaining in mild steel arc welds after the Mn has been consumed in deoxidation affects the mechanical properties of mild steel arc welds. The best result is obtained when it stays within the range between 0.35-0.45%.
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