被覆アーク溶接ヒュームの結晶組成に関する研究

概要

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Crystalline materials in welding fumes of covered electrodes have been identified by X-ray diffraction method. Nine test electrodes have been prepared with covering of single component material, MnO_2,Fe_2O_3 or SiO_2 using various binding agents. Five commercial electrodes including three types of non-lime electrodes and two types of lime electrodes have been used. The fume of tested electrode covered with MnO_2 or Fe_2O_3 consisted mainly of MnFe_2O_4 or Fe_3O_4 respectively. Fe_3O_4 and amorphous materials are formed in the fumes of tested electrode covered with SiO_2. The fumes of non-lime electrodes consisted mainly of Fe_3O_4. MnFe_2O_4 was also found in ilmenite type. Since these fumes contained about 20% SiO_2,other elements seemed to form amorphous materials together with SiO_2. The X-ray diffraction pattern of the fumes of lime type electrodes were so complicated that they were separated into water soluble, magnetic and non-magnetic materials. KCaF_3,NaF, CaF_2 and Fe_3O_4 were identified as the main crystalline materials in the fume of general lime type. NaF, CaF_2,MgO and Fe_3O_4 were identified in the fume of modified lime type. As soluble materials, K_2CO_3 or Na_2CO_3 was found in general type or modified type respectively. Both lime type fumes contained a little amount of chlorine as KCl.
社団法人溶接学会の論文
1983-11-05