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Öğe Adhesive weld bonding of interstitial free steel at spot welding for automotive application(Redakcia Kovove Materialy, 2010) Hayat, F.; Demir, B.; Acarer, M.; Aslanlar, S.In this study, the effect of adhesive bonding on strength and strength-ductility behaviour of welding joint in electrical resistance spot welding of 7315 grade IF steel sheets was investigated. 7315 grade (DIN EN 10130-1999) IF steels were adhesively bonded and different welding current and welding cycle conditions were performed in welding process. For adhesive bonding, Loctite Terostat 9120-Grey and Terostat 9220-Black grade adhesive bonders were used. Additionally, adhesively bonded joint samples were also performed without welding. Microstructure and tensile-shear tests of the adhesively bonded and welded materials were evaluated. Failure modes of the weld bonded tensile sheared samples were observed to be different from only welded samples. Experimental results have shown that with the increase in the weld time and weld current, the effect of the adhesive weld bonding on tensile performance also increases.Öğe The effect of cutting parameters on cutting force during the processing of inconel 718 super alloy(2007) Tasliyan, A.; Acarer, M.; Seker, U.; Gökkaya, H.; Demir, B.In this study, the effects of cutting parameters such as cutting speed, feed rate and cutting depth over cutting forces have been investigated. For this purpose, nickel based super alloy Inconel 718 has been processed with ceramic cutting tool having 1.2 mm insert radia on a digitally controlled turning lathe (CNC) without using cooling water. Different cutting processes having the values of five different cutting speeds (225, 300, 350, 400, 500 m/dak) and five different feed rates (0.05, 0.075, 0.1, 0.125, 0.15 mm/rev) and two different cutting depths (1mm, 2mm) have been implemented. In the experiments, the lowest main cutting force was obtained as (A-1-V) 192 N in 500 m/min cutting speed, 0.05 mm/rev feed rate speed and 1 mm depth of cut, the highest main cutting force was obtained as (B-5-I) 780 N in 225 m/min cutting speed, 0.15 mm/rev feed rate speed and 2 mm depth of cut.Öğe Effect of Ti on the Corrosion Behaviour of In-Situ Mg2Si Particle Reinforced Al-12Si-20Mg-XTi Alloys(Trans Tech Publications Ltd, 2010) Ahlatci, H.; Durmaz, A.; Balta, A.; Acarer, M.; Candan, E.In this study, corrosion behaviour of Al-12Si-20Mg-XTi alloys (Ti content varied between 0 and 4 wt.%) was investigated. Characterizations of the alloys were carried out by microstructural examinations and corrosion tests. Microstructural results showed that precipitation of the Mg2Si phases was observed in Al-12Si-20Mg-XTi alloy matrix as two different morphologies; i.e. as a polyhedral primary particle and as a chinese script. Upon addition of Ti, Al3Ti intermetallic precipitated in the alloy. Corrosion tests were carried out by immersing the alloys in 30 g/l NaCl+10 ml/l HCl solution. Evaluation of corrosion was determined by measuring weight loss for 24 hours and by potentiodynamic polarization tests. Corrosion resistance of the alloy was approximately constant with 1 wt % Ti addition whereas at higher additions, the corrosion rate increased.Öğe Effect of weld time and weld current on the mechanical properties of resistance spot welded IF (DIN EN 10130-1999) steel(Redakcia Kovove Materialy, 2009) Hayat, F.; Demir, B.; Acarer, M.; Aslanlar, S.In this study, the effects of weld current and weld time on the tensile peel strength and tensile-shear strength of 7114 grade IF (Interstitial Free) steel sheets joined by spot welding were investigated. Weld processes were performed by using 3, 5, 7, 9 kA weld current and 5, 10, 15, 20, 25, 30 weld cycles. The microstructure of the welded materials was evaluated. The hardness profiles were also determined. Experimental results showed that tensile shear loading bearing capacity and hardness of both weld and heat affected zones increased for increasing weld time and weld current. Weld nugget diameter extended by increasing weld time or/and weld current, so tensile shear load bearing capacity and tensile peel strength increased. Tensile fracture behaviour of the samples was evaluated. Weld lobe was constructed with respect to weld current and time.Öğe Effect of weld time and weld current on the mechanical properties of resistance spot welded IF (din en 10130-1999) steel(2009) Hayat, F.; Demir, B.; Acarer, M.; Aslanlar, S.In this study, the effects of weld current and weld time on the tensile peel strength and tensile-shear strength of 7114 grade IF (Interstitial Free) steel sheets joined by spot welding were investigated. Weld processes were performed by using 3, 5, 7, 9 kA weld current and 5, 10, 15, 20, 25, 30 weld cycles. The microstructure of the welded materials was evaluated. The hardness profiles were also determined. Experimental results showed that tensile shear loading bearing capacity and hardness of both weld and heat affected zones increased for increasing weld time and weld current. Weld nugget diameter extended by increasing weld time or/and weld current, so tensile shear load bearing capacity and tensile peel strength increased. Tensile fracture behaviour of the samples was evaluated. Weld lobe was constructed with respect to weld current and time.Öğe The influence of some factors on steel/steel bonding quality on there characteristics of explosive welding joints(2004) Acarer, M.; Gülenç, B.; Findik, F.Explosive welding is a solid state process in which controlled explosive detonations force two or more metals together at high pressures. The resultant arrangement is joined with a high quality metallurgical bond. The aim of this study was to investigate of strength of explosive welding metals which had same chemical compositions. In this study, it was taken different welding interfaces (straight, wavy and continuous solidified-melted) with changing explosive welding parameters (stand-off distance (s), explosive loading (R) and anvils). Joined metals were investigated in heat treatment and non heat treatment conditions. Microstructures, microhardness, tensile shear strength and bending test results were reported. Effect of anvil on explosive welding process was evaluated in joining/no joining performance. It was shown that bonding interface changed from straight to wavy structure when explosive loading and stand-off distance were increased. On wavy interface, when explosive loading was increased wavy length and amplitude increased. Results of tensile shear and bending tests showed that heat treated specimens have more strength than which of unheat-treated ones. According to tensile shear test results, straight and wavy interfaces had similar strength. Also, bending zone has shown some cracks after the bending test of unheated specimens. © 2004 Kluwer Academic Publishers.Öğe Investigation of corrosion properties of box boring din 20MnCr5 steel bars(EDP Sciences, 2023) Sahin, N.; Isikgül, A.; Ziyamukhamedova, U.; Ahlatci, H.; Acarer, M.; Sevim, M.In this study, boriding process was carried out on ? 11 mm diameter DIN 20MnCr5 quality steel bars, used in chain elements such as links and rings, and fasteners such as bolts, at 950oC boronizing temperature, boriding times of 2.5 and 7.5 hours. In this study, the formation and growth of the boride layer and the metallographic structure, the coating thickness and corrosion properties of the boronized steels were investigated depending on the boriding conditions. In the box boriding process, Ekabor-II powder mixture, with its commercial name, was used as boriding powder. According to the optical microstructure results made as a result of box boriding, the coating thickness was 371.5 ?m in the ? 11 mm diameter boronized DIN 20MnCr5 steel bar for 7.5 hours boriding times while it was 195.6 ?m in that steel bar for 2.5 hours boriding times. Corrosion experiments were carried out in solutions prepared by adding 3.5% NaCl to distilled water. According to the results of the immersion test, the lowest corrosion rate in mdd was measured as 112 mg/(dm2 x day) in the ? 11 mm diameter, 7.5 hour boronized sample, and the highest corrosion rate in mdd was 1456.75 mg/(dm2 x day) in the untreated ? 11mm diameter sample. In the potentiodynamic polarization test, parallel results were obtained for immersion corrosion. Corrosion rate values (icor) were measured at the highest value of 209 x 10- 6 A/cm2 in the untreated ? 11 diameter sample, while the lowest icor value was 0.0039 x 10- 6 A/cm2 in the ? 11 mm diameter sample borided for 7.5 hours. © 2023 EDP Sciences. All rights reserved.Öğe An investigation on the explosive cladding of 316L stainless steel-din-P355GH steel(2004) Kacar, R.; Acarer, M.In this study, 316L stainless steel and DIN-P355GH grade vessel steel were cladded by explosive welding technique. Microstructure, hardness and tensile shear strength, and fracture toughness of the cladded metals were evaluated. The bond interface of the cladded metals shows a wavy morphology. The hardness was increased in the parent and flyer plate near the bond interface while a general decrease was observed in both parent and flyer plate away from welded interface. Tensile shear test results showed that the bonding is acceptable. The impact toughness of the cladded metals at a given test temperature is found significantly higher than that of parent plate alone because of the high impact toughness of 316L austenitic stainless steel layer. Consequently, mechanical properties of the low-carbon steels can be increased by explosive cladding with austenitic stainless steel. © 2004 Elsevier B.V. All rights reserved.Öğe Tensile shear stress and microstructure of low-carbon dual-phase Mn-Ni steels after spot resistance welding(Springer, 2007) Hayat, F.; Demir, B.; Acarer, M.Tensile shear stresses and microstructure of dual steels with different volume fractions of martensite are studied after spot resistance welding. A Mn-Ni low-carbon steel heated in the intercritical temperature range and cooled in water and in air is studied. Spot resistance welding of test pieces is performed for different times at constant welding pressure and peak value of the welding current. The microstructure of the welded specimens is investigated and their permissible tensile shear stresses are determined.
