A Study on Effect of Polarity on Mechanical Properties in Saw Process

Abstract

Welding is one of the most common fabrication techniques which is extensively used to obtain desirable quality welds for intended application in various structural components. The invariable importance of welding processes has been very well realized since long times ago, therefore till nowadays there is hardly any sector of human life which has not been benefited from applications of welding. Apart of quality of flux and welding parameters, welding processes are strongly influenced by extent of heat generated during the welding process which in turn depends upon polarity adapted during the process as it affects the weld quality. As far as flux is concerned it preserves the electrode and weld pool from atmospheric contamination by confining the heat produced by the arc at controllable parameters of the welding. Submerged arc welding can be performed at both straight polarity and reverse polarity. In straight polarity work piece is positive whereas in reverse polarity welding electrode is a positive terminal which varies the extent of heat produced at the both electrodes. The variation in extent of heat produced further alters not only composition of weld but it also varies the other properties of weld which decides its suitability for intended service. Hence, polarity change alters the weld quality which can also be accessed through mechanical properties of weld. Therefore, it is essential to understand the effect of polarity change on mechanical properties of the weld and this work has been focused on behavior of the polarity on the tensile strength of the selected substrate material.