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In this study, the surfaces of AISI 1050 Medium Carbon Steel and D2 Cold Work Tool Steel, which are commonly used in the machine manufacturing industry, were processed using the burnishing method. In the burnishing experiments, cylindrical materials with dimensions of Ø50x30mm and a Ø20mm hole drilled in the center were used. For the turning process, the cutting speed was selected as 60 m/min and the feed rate as 0.25 mm/rev. The burnishing process was applied in a single pass. The properties such as microhardness, surface morphology, circularity, cylindricality and surface roughness of the materials by the burnishing process were examined in detail. After burnishing, the hardness of AISI 1050 and D2 cold work tool steel materials was measured to be 292 HV and 302 HV, respectively. The results obtained showed that the burnishing process increased the hardness value of AISI 1050 steel proportionally more than the hardness value of D2 steel. It was determined that the circularity and cylindrical properties of the hole surfaces were improved. The obtained results show that the burnishing process will increase the efficiency of the machine elements working in contact and the damage that may occur during the operation of these machine elements can be minimized by burnishing process. [ABSTRACT FROM AUTHOR]

In this study, the effect of different electrode tip types on weld nugget diameter, tensile shear strength and microhardness properties of advanced high strength steel combined with resistance spot welding method was investigated. For this purpose, resistance spot welded joints were performed using conical round, flat R3, flat R6 and flat conical electrode tips, which are preferred especially in the automotive industry. Test samples were subjected to weld nugget geometry macro-micro examination, mechanical and metallurgical investigations. Experimental results showed that there is a linear relationship between weld nugget diameter value, microhardness results and tensile shear strength values. The highest tensile shear strength values were obtained with flat 3 mm radius tip electrodes, and the lowest tensile shear strength values with flat conical tip electrodes. [ABSTRACT FROM AUTHOR]