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Öğe Artificial neural network application to the friction-stir welding of aluminum plates(Elsevier Sci Ltd, 2007) Okuyucu, Hasan; Kurt, Adem; Arcaklioglu, ErolAn artificial neural network (ANN) model was developed for the analysis and simulation of the correlation between the friction stir welding (FSW) parameters of aluminium (Al) plates and mechanical properties. The input parameters of the model consist of weld speed and tool rotation speed (TRS). The outputs of the ANN model include property parameters namely: tensile strength, yield strength, elongation, hardness of weld metal and hardness of heat effected zone (HAZ). Good performance of the ANN model was achieved. The model can be used to calculate mechanical properties of welded Al plates as functions of weld speed and TRS. The combined influence of weld speed and TRS on the mechanical properties of welded Al plates was simulated. A comparison was made between measured and calculated data. The calculated results were in good agreement with measured data. (c) 2005 Elsevier Ltd. All rights reserved.Öğe Dubleks Paslanmaz Çeliklerde Sigma Fazının Korozyon Dayanımına Etkileri(Kırıkkale Üniversitesi, 2015) Başyiğit, Aziz Barış; Kurt, AdemDubleks and nbsp;paslanmaz and nbsp; çelikler; and nbsp; delta-ferrit and nbsp;ve and nbsp; östenit and nbsp; fazlarının yaklaşık and nbsp; olarak and nbsp;yarı-yarıya and nbsp; bir arada bulunduğuve ferritik ile östenitik türlere göre yeterli korozyon dayanımı ve mukavemetözelliklerinin bir arada istendiği uygulamalarda tercih edilmektedir.Bu çalışmada; dubleks paslanmaz çeliklerde ısıl işlem vekaynakuygulaması veya kullanım ömrü süresince değişen termal koşullara göremikro yapıda oluşabilecek zararlı fazlardan olan sigma fazının tespit edilmesive korozyon davranışlarına etkilerinin incelenmesi amaçlanmıştır. Sigma and nbsp; fazı and nbsp;iki and nbsp; ayrı and nbsp; ana and nbsp;malzemede and nbsp; ısıl and nbsp; işlem and nbsp;ile and nbsp; oluşturulmuş, mikro and nbsp; yapısal and nbsp;ve and nbsp; korozyon davranış durumlarıincelenmiştir. Bu amaçla; sigma fazının en hızlı oluştuğu 800°C sıcaklığıısıl and nbsp; işlem and nbsp; amacıyla and nbsp;seçilmiş ve and nbsp; iki and nbsp;ayrı and nbsp;numuneye and nbsp; 5,5 and nbsp; saat and nbsp;ve and nbsp; 16 and nbsp; saat and nbsp;sürelerle and nbsp; ısıl and nbsp; işlem uygulanmıştır. and nbsp; Bu and nbsp;sıcaklıkta and nbsp; bekleme and nbsp; süresinin and nbsp;sigma and nbsp; fazının and nbsp; miktarına and nbsp;ve and nbsp; korozyon dayanımına etkileride araştırılmıştır.Öğe The Effects of Nitrogen Gas on Microstructural and Mechanical Properties of TIG Welded S32205 Duplex Stainless Steel(Mdpi, 2018) Basyigit, Aziz Baris; Kurt, AdemDuplex stainless steels are gaining greater interest due to their increasing amounts of application fields. Accordingly, there is a need for awareness of problems associated with improper microstructural distributions such as delta-ferrite (delta-ferrite), austenite and other important intermetallic phases that may form in these steel weldments. Since delta-ferrite versus austenite ratio profoundly influences corrosion and mechanical properties, optimum delta-ferrite ratios must be kept approximately within 35-65 vol % and balance austenite to maintain satisfactory corrosion and mechanical properties on welding of these steels. Cooling rates of welds and alloying elements in base metal are the major factors that determine the final microstructure of these steels. In this work, 3 mm thickness of 2205 duplex stainless-steel plates were TIG (Tungsten Inert Gas) welded with various amounts of nitrogen gas added to argon shielding gas. Specimens were joined within the same welding parameters and cooling conditions. As nitrogen is a potential austenite stabilizer and an interstitial solid solution hardener, the effects of nitrogen on mechanical properties such as hardness profiles, grain sizes and microstructural modifications are investigated thoroughly by changing the welding shielding gas compositions. Increasing the nitrogen content in argon shielding gas also increases the amount of austenitic phase while delta-ferrite ratios decreases. Nitrogen spherodized the grains of austenitic structure much more than observed in delta-ferrite. The strength values of specimens that welded with the addition of nitrogen gas into the argon shielding gas are increased more in both austenitic and delta-ferritic structure as compared to specimens that welded with plain argon shielding gas. The addition of 1 vol % of nitrogen gas into argon shielding gas provided the optimum phase balance of austenite and delta-ferrite in S32205 duplex stainless-steel TIG-welded specimens.Öğe Investigation of the Weld Properties of Dissimilar S32205 Duplex Stainless Steel with AISI 304 Steel Joints Produced by Arc Stud Welding(Mdpi Ag, 2017) Basyigit, Aziz Baris; Kurt, AdemUNS S32205 duplex stainless steel plates with a thickness of 3 mm are arc stud welded by M8 x 40 mm AISI 304 austenitic stainless steel studs with constant stud lifts in order to investigate the effects of welding arc voltages on mechanical and microstructural behaviors of the joints. As the welding arc voltage increases starting from 140 V, the tensile strength of the weldment also increases but the higher arc values results in more spatters around the weld seam up to 180 V. Conversely, the lower arc voltages causes poor tensile strength values to weldments. Tensile tests proved that all of the samples are split from each other in the welding zone but deformation occurs in duplex plates during the tensile testing of weldments so that the elongation values are not practically notable. The satisfactory tensile strength and bending values are determined by applying 180 volts of welding arc voltage according to ISO 14555 standard. Peak values of micro hardness occurred in weld metal most probably as a consequence of increasing heat input decreasing the delta ferrite ratios. As the arc voltage increases, the width of the heat affected zone increases. Coarsening of delta-ferrite and austenite grains was observed in the weld metal peak temperature zone but it especially becomes visible closer to the duplex side in all samples. The large voids and unwelded zones up to approximately 1 mm by length are observed by macro-structure inspections. Besides visual tests and micro-structural surveys; bending and microhardness tests with radiographic inspection were applied to samples for maintaining the correct welding parameters in obtaining well-qualified weldments of these two distinct groups of stainless steel materials.Öğe S32205 Dubleks Paslanmaz Çeliğin TIG Kaynağında Soğuma Hızının Mikroyapısal Özelliklere Etkileri(Kırıkkale Üniversitesi, 2015) Başyiğit, Aziz Barış; Kurt, AdemDubleks paslanmaz çeliklerin kaynağı artan uygulama alanlarından dolayıbelirgin şekilde ilgi kaynağı olmaktadır. Bu çeliklerin kaynaklıbağlantılarında oluşabilecek delta-ferrit, östenit ve diğer önemlimetaller-arası fazların uygun olmayan dağılımları ile ilgili problemler önemkazanmaktadır. Kaynak işlemlerinde tatminkar korozyon ve mekanik özelliklerielde edebilmek için optimum delta ferrit oranları hacimce yaklaşık olarak%35-60 aralığında olması gerekmektedir.Bu çalışmada 3 mm kalınlığındaki 2205 dubleks paslanmaz çelik numuneler safargon koruyucu gazı kullanılarak TIG kaynak yöntemi ile birleştirilmiştir.Farklı kaynak soğuma koşullarının mikroyapısal değişikliklere etkileriincelenmiştir. and nbsp;
