Abstract
Recently much efforts have been done in the field of physical chemistry of welding process. In this work an attempt is made to evaluate the sulphur distribution of basic weld metal.
The degree of basicity of slag is changed by varying the ratio of CaO to SiO2. To remove sulphur from the weld metal a high basic slag is more effective than an acidic slag, and log K'si, s becomes propotional to the basicity BL. The values of log Ko' and log K'Mn can not be constant throughout the whole range of expcrimental slag, and log K'Mn takes a higher value at the acidic side whereas log Ko' gradually increases at the basic side of slag. In the range of acidic slag log K'Si increases proportionally to basicity.
Through deoxidation by manganese in the basic covered electrode weld metal silicon would not enter the weld metal until the basicity of slag dicreases below the BL of 0.8.
The oxygen content of a weld metal containing sulphur is much higher than on ordinary weld metal.
