Development of wear resistant surfaces through weld surfacing

Abstract

v newlineABSTRACT newlineThe need for surfacing and related activities has grown in industries, which has given chance researchers to develop effective methods. In order to save raw material investments, processing costs, and ensure proper resource usage, metal surfacing is increasingly the obvious choice. A key component of surfacing is hardfacing, which depends on the chemical differences between the parent metal and the weld, the welding procedure, and the welding technique utilised. The hardfacing process has a significant impact on both mechanical and metallurgical qualities. Nearly all welding techniques used for surface operations have their own setbacks, such as inconsistent operation, low productivity, positional restrictions, high heat input, high investment, improper operating parameter selection etc. newlineAn investigation into various aspects of the technology is an essential part of research and this research work was designed accordingly to study problems related weld bead geometry, dilution , tensile stress, wear behavior, microstructure and microhardness. A paste of alloying elements namely ferrochrome, ferrovanadium, ferromolybdenum, ferromanganese, carbon and nickel was overlaid on substrate. The submerged arc welding (SAW) process was selected for experiment work. newlineEight experiments were conducted in three sets according to the random run suggested by two-level fractional factorial design were carried out for investigating the mechanical and metallurgical properties of the mild steel. The tensile stress, wear and hardness after treatment were compared with base metal parameters. Metallurgical specimens were prepared using standard techniques and were observed under optical microscope at different magnifications. Microstructures of weld bead and heat affected zones (HAZ) were analyzed. Micro hardness testing was carried newlinevi newlineout in longitudinal and transverse direction within the weld bead, heat affected zone and the adjoining base material. In the experiment the weld bead width, dilution, wear, tensile stress, micro