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Öğe Analysis of optical radiation emissions during GMAW applications(Natsional'na Akademiya Nauk Ukrainy, 2015) Gürsel, Ali; Kurt, AdemThe GMAW (Gas Metal Arc Welding) technique and its radiation emissions are examined in this study. Three commonly used materials in industry, SS304-type stainless steel, A36 low-carbon steel, and T6061 aluminium, are chosen for the tests. The welding is applied at 140 A, and radiation types and luminosities are evaluated for each material. During the welding processes, ultraviolet radiation was the most frequently observed at all parameters; in addition, visible light and infrared radiation, 200-1000 nm on an optical scale, are recorded. The effects of electric currents on the photon energy rates are clearly exhibited. The wavelengths are similar on the SS304 and A36 materials, but higher photon energy and intensity are observed on SS304. Furthermore, for the T6061 aluminium material, the optical radiation emission and peak patterns are totally different from the others, with peaks spiking over the entire range of the optical scale.Öğe Diffusion bonding of iron and bronze by mirowave sintering(European Powder Metallurgy Association (EPMA), 2007) Kurt, Adem; Ateş, Hakan; Uygur, İlyas; Gürhan, A.H.In this study, diffusion bonding of Fe and Bronze (90%Cu+10% Sn) powders used as bearing materials has been investigated by microwave sintering. For this purpose Fe and Bronze powders were compacted at 250, 350 and 500 MPa and sintered via microwave energy and conventional sintering process. Green and sintered densities were measured. Fe- Bronze interfaces and porosity changes were investigated after microwave and conventional sintering.Öğe Effect of Friction Welding Parameter on Mechanical and Microstructural Properties of Dissimilar AISI 1010-ASTM B22 Joints(Amer Welding Soc, 2011) Kurt, Adem; Uygur, İlyas; Paylaşan, U.Rotary friction welding is one of the most economical and efficient production methods for joining similar and dissimilar materials. It is widely used with metals and thermoplastics in a wide variety of aviation, transport, and aerospace industrial component designs. Individually, mild steel to mild steel and copper to copper are normally easy to weld by fusion welding methods, but the joint of mild steel to copper can be extremely difficult due to the differences in the two materials' melting temperature, density, strength, and thermal conductivity. Thus, these kinds of problems can be eliminated by a solid-state friction welding technique. Hence, the current study attempts to understand the friction welding characteristics of mild steel-bronze dissimilar parts. This study looks into the influence of process parameters, which includes friction pressure, upsetting pressure, and upset time on the axial shortening, hardness, microstructure, and tensile properties of the welds. The optimum parameters for upset time, upset pressure, and friction pressure necessary for welding were obtained. Finally, the obtained mechanical properties results were commented on the light of optical microscopy.Öğe Effect of friction welding parameters on mechanical and microstructural properties of dissimilar AISI 1010-ASTM B22 joints(2011) Kurt, Adem; Uygur, İlyas; Paylaşan, U.Rotary friction welding is one of the most economical and efficient production methods for joining similar and dissimilar materials. It is widely used with metals and thermoplastics in a wide variety of aviation, transport, and aerospace industrial component designs. Individually, mild steel to mild steel and copper to copper are normally easy to weld by fusion welding methods, but the joint of mild steel to copper can be extremely difficult due to the differences in the two materials' melting temperature, density, strength, and thermal conductivity. Thus, these kinds of problems can be eliminated by a solid-state friction welding technique. Hence, the current study attempts to understand the friction welding characteristics of mild steel-bronze dissimilar parts. This study looks into the influence of process parameters, which includes friction pressure, upsetting pressure, and upset time on the axial shortening, hardness, microstructure, and tensile properties of the welds. The optimum parameters for upset time, upset pressure, and friction pressure necessary for welding were obtained. Finally, the obtained mechanical properties results were commented on the light of optical microscopy.Öğe The Effect of Materials on Radiation Exposure during the GTAW Process(Amer Welding Soc, 2014) Gürsel, Ali; Kurt, AdemIn this study, the gas tungsten arc welding (GTAW) technique was used to weld samples of three materials: SS304-type stainless steel, A36 low-carbon steel, and 16061 aluminum. The welding was applied at 200 A, and the radiation types and luminosities were measured for each material. During the welding processes, UV radiation was the most frequently observed in all parameters; in addition, visible light and IR radiation, 200-1000 nm on an optical scale, were recorded. The effects of electric currents on the photon energy rates were clearly exhibited. The production and type of radiation (photon energy and high-frequency energy) were affected by the GTAW applications using tungsten electrodes containing 2% thorium, thus corroborating previous findings in the literature.Öğe Investigation of changes in mechanical properties and microstructures of mild steel joint by oxy-hydrogen welding(Natsional'na Akademiya Nauk Ukrainy, 2014) Ateş, Hakan; Çakır, M.E.; Kurt, Adem; Uygur, İlyas; Türker, MehmetIn this paper, in order to see weldability behaviour of mild steels joint by the oxy-hydrogen welding technique, an investigation of changes in mechanical properties and microstructures of mild steel is carried out. The specimens with 1.5 mm thickness and 125 mm length are welded by using both the oxyhydrogen and oxy-acetylene gases. Microstructural analysis is carried out on the cross sectional area of the welding zone in order to compare the changes in weld metals and the heat affected zones in terms of the welding gases. Experimental results of the tensile strength and microhardness obtained with mechanical tests show that samples welded with oxy-acetylene exhibited 10% higher yield strength than that of the samples welded with oxy-hydrogen. However, the oxy-hydrogen welding technique can be used as an alternative to the oxy-acetylene welding, since it has advantageous of being clean and economic.Öğe Investigation of weldability of powder metal plates by friction stir welding(2008) Ateş, Hakan; Kurt, Adem; Çakır, Mustafa; Uygur, İlyasPowder metallurgy is one of the most common methods for fabricating many engineering components. However, one of the major difficulties for these materials is joining techniques. In this study, Aluminium powders produced by atomization method have been pressed with the pressure 370 MPa. They have been sintered under argon atmosphere in periods of 60 minutes at 600 °C afterwards. The dimension of Al plates were 5×45×55mm. Three tool rotation speeds (700, 900, 1100 and 1400rpm) in the clockwise direction were chosen and specimens were joined by friction stir welding (FSW) technique. The hardness values of welded specimens were evaluated and three point bending tests were performed. Also macro and microstructures were investigated for the tested materials. The optimum welding properties were obtained with 900 rpm tool rotation speed.© 2008 Metal Powder Industries Federation.Öğe The microstructure and mechanical properties of joints of technical-grade aluminium gas welded with oxygen-hydrogen flame(Taylor and Francis Ltd., 2014) Ateş, Hakan; Çakır, M.E.; Kurt, Adem; Türker, Mehmet; Uygur, İlyasThe goal of this study was to investigate the weldability of aluminum by using the oxy-hydrogen welding technique. Specimen dimensions were 1.5 mm in thickness and 80 mm in length. Microstructural investigations on the cross-sectional area of the weld zone were also carried out in order to compare weld metal and HAZ depending on the welding gases. Tensile strength and microhardness tests were carried out and the results were compared. Test results have shown that the yield strength of the samples welded with oxy-acetylene is higher than that of the samples welded with oxy-hydrogen. © 2013 © 2013 Taylor & Francis.Öğe Radiation Emission during SMAW Applications on SS304 and A36 Steels(Carl Hanser Verlag, 2014) Gürsel, Ali; Kurt, AdemHigh energy radiation is produced during arc welding applications. For this reason, it is important to investigate the process in detail with respect to the welding technique, electrical current and materials. In this study, the SMAW (shielded metal arc welding) technique was used to weld specimens made of stainless steel SS304 and of low carbon steel A36. Welding currents of 90, 105, 120 and 135 A were selected. The radiation types and luminosities were measured for each material as well as the respective magnitude of electrical current. During the welding applications, UV radiation was mostly observed. In addition, visible light and IR radiation in the range of 200 to 1000 nanometers on the optical scale were recorded. The effects of electric currents on the photon energy rates were clearly pronounced. A larger radiation energy was observed for the UV band for welding both materials at all parameters.Öğe Surface modification of aluminium by friction stir processing(Elsevier Science Sa, 2011) Kurt, Adem; Uygur, İlyas; Çete, ErenIn this study. SiC particles were incorporated by using Friction Stir Processing (FSP), into the commercially pure aluminium to form particulate surface layers. Samples were subjected to the various tool rotating and traverse rates with and without SiC powders. Microstructural observations were carried out by employing optical microscopy of the modified surfaces. Mechanical properties like hardness and plate bending were also evaluated. The results showed that increasing rotating and traverse rate caused a more uniform distribution of SiC particles. The hardness of produced composite surfaces was improved by three times as compared to that of base aluminium. Bending strength of the produced metal matrix composite was significantly higher than processed plain specimen and untreated base metal. (C) 2010 Elsevier B.V. All rights reserved.
