サブマージアーク溶接における脱酸反応におよぼすスラグ塩基度の影響

サブマージアーク溶接における脱酸反応に関する研究(第1報)

抄録

The effect of slag basicity on silicon and manganese deoxidation in the submerged-arc welding process is considered by bead-on-plate welding performed using agglomerated fluxes of CaO-MgO-Al₂O₃-SiO₂ system.
Dissolved oxygen content in molten pool is remarkably affected by oxygen which is originated from dissociation of silica in slag, then oxygen content in weld metal can be decreased by a reduction of the activity of silica. The arc cavity is almost filled with CO gas, and PCO₂/PCO in the atmosphere is decreased with increasing slag basicity. Ratio of oxygen content in weld metal to FeO content in slag takes a constant value independently of the slag basicity. Oxygen in weld metal deposited with MnO-free fluxes seems to be quasi-equilibrium relation with silicon at about 1950°C independently of manganese content in weld metal.