ABSTRACT
In the present work, application of optical metallography was implemented to study the microstructure of the IS2062 which is a low carbon steel specimen subjected to metal inert gas (MIG) welding. Specimens before and after heat treatment process are considered. The optical inspection was carried out at the base metal (BM) zone, heat treatment zone, and welded zone using an optical microscope. Using the test reports obtained from the analysis, we established relations between various microstructural and mechanical properties such as grain size, volume fraction, strength, and hardness.
The present work is the experimental investigation of the effect of grain size on hardness of IS2062 MIG weldment before and after heat treatment process. The butt joint of IS2062 steel is welded by MIG welding process. 230The two similar butt joint welded structures are made, one without heat treatment and the other with heat treatment to investigate the effect of heat treatment. The optical metallography (OM) was implemented to study the microstructure of the welded structure. The optical inspection was carried out at the BM area, heat affected area, and welded zone using an optical microscope in both structures to obtain grain size and volumetric phase analysis. It is observed that the grain was indirectly proportional to hardness and strength of materials.
