The Study of Metallurgy Structure of 50-Pound Sized of Railway Hard Surfacing Welding by Shielded Metal Arc Welding Process
This study was focused on metallurgy structure by railway hard surfacing welding process from shielded metal arc welding (SMAW). The material in the study was 50-pound sized railway. The two major variables were hard surfacing electrodes: HF 350R and HF 450R. After welding experiment, there was no crack appearing on welding surface. However, small metal particles scattered distribution the surface of the welds of two variables. From macroscopic examination of metals, there were no crack or porosity in the welding zone. In heating influenced area of welding with HF 350R welding rod, the thermal radiation was less than welding with HF 450R. From microscopic examination of metals with HF 450R rod, the structure was clearer than welding with HF 350R. In the heating area, it consisted of ferrite mixed with martensite structures which mostly occurred from welding with HF 450R rod. From microscopic examination of metals, there were no crack or porosity in welding zone.
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