Abstract
Pure iron plates were welded using Fe-Ti alloy electrode wires in a controlled arc atmosphere. The effects of titanium on the oxygen contents and non-metallic inclusions in the weld metals were investigated under various welding conditions in Ar-O2 and Ar-CO2 welding atmospheres.
The oxygen contents of the Fe-Ti weld metals increase with an increasing the partial pressure of oxidizing gases and decrease with an increasing titaninum contents in the weld metals. The oxygen contents of the weld metals welded in Ar-CO2 are lower than those in Ar-O2. The non-metallic inclusions are mainly titanium-oxide. The compositions of the non-metallic inclusion in the Fe-Ti weld metals take various form of Ti2O3, TiO2, FeO-TiO2, 2FeO-TiO2 and FeO depending to the increasing oxygen content and decreasing titanium content of the weld metals. Behavior of the oxygen absorption by the steel weld metal is discussed using thermodynamic data.
