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    THE EFFECT OF THIN SECTION CASTING ON THE HARDNESS AND TENSILE STRENGTH OF GGG40
    (Tanger Ltd, 2014) Genc, Serhan Karaman; Cetinarslan, Cem S.; Ozel, Kaan
    Today, ferrous metals include large part of industry in the world although many non-ferrous metals and other materials discovered. Steel and cast iron are the important ferrous metals because of their mechanical, physical properties and behaviors. After the discovery of the nodular cast iron, it began to burst into prominence. Because, its similarity to steels from the point of mechanical properties and to cast irons in terms of chemical and physical properties. Besides, nodular cast iron has low cost, good castability and convenient machinability property. In this study, GGG40, which is widely used in modern industrial production, was chosen as test material. The test specimens with different diameters 20 mm, 25 mm and 30 mm were prepared by casting. Thin section casting is the fundamental point of this study. Then, tensile tests, brinell tests and spectrum analysis were performed and investigated.
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    An experimental study on joining of severe plastic deformed aluminium materials with friction welding method
    (Elsevier Sci Ltd, 2008) Sahin, Mumin; Akata, H. Erol; Ozel, Kaan
    In this study, 5083 aluminium alloys, which were exposed to severe plastic deformation, were joined with friction welding method and the variation in mechanical properties of the joints was experimentally investigated. Severe plastic deformation methods can be classified as equal channel angular pressing (ECAP) (in other words, equal cross section lateral extrusion-ECSLE) and cyclic extrusion-compression. Aluminum alloy as test material 5083 and square cross-sectional equal channel angular pressing die for severe plastic deformation were used in the study. Firstly 5083 alloys, as purchased, were joined with friction welding method. The optimum parameters for friction time, upset time, friction pressure and upset pressure, which are necessary for welding, were obtained. Afterwards, 5083 aluminium materials as purchased were prepared as square cross-section and then I-pass severe plastic deformation was applied to specimen by equal channel angular pressing die. The obtained parts as square form were prepared as cylindrical form by machining and then the parts were joined by continuous drive friction welding equipment that was designed and produced in laboratory conditions before. Later, the tensile strengths of the parts, obtained at optimum conditions, were compared with those of the joined parts as purchased form. Then, hardness variations and microstructures of joints were examined. Finally, the obtained results were commented on. (C) 2006 Elsevier Ltd. All rights reserved.
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    Mechanical and Metallurgical Properties of Aluminium and Copper Sheets Joined by Cold Pressure Welding
    (Assoc Mechanical Engineers Technicians Slovenia, 2008) Ozel, Kaan; Sahin, Mumin; Akdogan, Aysegul
    Cold pressure welding is a special welding method that has been used in applications such as assembly of various parts at an increasing rate in recent years. In the present paper, cold pressure welding was applied to commercial purity aluminium and copper sheets as lap welding and a 150 metric ton hydraulic press was used for the process. As the surface roughness and the weld deformation ratia of aluminium sheets increased, tensile strength of the joints also increased Purchased specimens with original roughness had the lowest weld deformation as-is and it was not possible to join these sheets at 30% weld deformations. Fatigue tests showed that joined sheets resisted against low fluctuating tensile stresses. Hardness increases due to local hardening at the interface as a result of cold deformation. Also EDX (Energy Dispersive X-ray) measurements clearly show that Al-Cu joints contain an intermetallic compound layer at the interlace which does not affect the joint strength to a great extent. Results showed that the cold pressure welding technique in lap form resulted in strong Al-Al joints and the intermetallic layer formed in Al-Cu joints did not affect the joint strength to a great extent. (C) 2008 Journal of Mechanical Engineering. All rights reserved.
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    Mechanical and metallurgical properties of pipeline steel manual arc welds dependent on cellulosic electrode coating
    (Carl Hanser Verlag, 2018) Cetinarslan, Cem S.; Ozel, Kaan; Tufan, Mehmet
    Spiral welded pipes of 1016 mm diameter and 8.80 mm thickness, made of St 44.2 (DIN 17100) structural steel and commonly used for drinking water pipelines were joined via coated electrodes through manual arc welding. In the welding process, cellulosic electrodes of three different brands were used, after which non-destructive and destructive testing methods and metallurgical probing were carried out for the parts joined. In this study, welding metal, fusion lines, heat affected zones and base material micro structural variations were experimentally investigated as well as tensile, hardness and bending tests according to electrode brands used for welded parts and interpreted through existing literature on the subject.
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    Mechanical properties of friction stir welded 5083 aluminum alloys
    (Carl Hanser Verlag, 2017) Ozel, Kaan; Cetinarslan, Cem S.; Sahin, Mumin
    Friction stir welding (FSW) is a solid phase welding method, developed for aluminum alloys by The Welding Institute (TWI), which is applied in non-traditional welding techniques. The industrial applications of this method have been intensified in recent years. In this method, parts in various geometries can be joined in solid state. In this study, Al-Mg based 5083 aluminum alloys, which are widely used in industry, were joined by friction stir welding method and the mechanical properties of the joints were determined. The mechanical properties of joined parts were experimentally investigated using tensile, hardness and fatigue tests for 550, 700, 800 and 1400 rpm rotation speeds with 40 mm x min(-1) and 80 mm x min(-1) progressing speed, respectively.
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    On properties at interfaces of friction welded near-nanostructured Al 5083 alloys
    (Springer London Ltd, 2012) Sahin, Mumin; Balasubramanian, N.; Misirli, Cenk; Akata, H. Erol; Can, Yilmaz; Ozel, Kaan
    Equal-channel angular pressing is a material processing method that allows very high strains to be imposed, which leads to extreme work hardening and micro-structural refinement, with minimal change of external sample dimensions. It offers possibilities of good mechanical properties, such as high strength and ductility, while allowing flexibility of choice of alloy composition for better corrosion behavior, lower materials costs, and so on. This study characterizes for the first time the microstructure and properties of aluminum friction welded after severe plastic deformation via the equal-channel angular pressing method. In this study, 5,083 aluminum alloys, which were exposed to severe plastic deformation using square cross-sectional equal-channel angular pressing die, were joined with friction welding method. It was found that tensile and fatigue strengths of severe plastic deformed and welded specimens were higher than those of the purchased specimens. Hardness values were also consistent with the strength results. However, the refining of grain size as shown from microstructures results in a significant increase in hardness and mechanical properties.