Uğur Özdemir

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• Master of Science
• Research Assistant at Gazi University

Hot-dip galvanizing performances of various filler metals were investigated in this study. S355JR grade structural steel plates were joined with four different filler wires in solid, flux-cored, and metal-cored forms in different chemical compositions, then cooled at ambient temperature. Later, specimens were subjected to a hot-dip galvanizing proc...

Hyper duplex stainless steels (HDSS), which are the most advanced products of the duplex stainless steel class, containing ferrite and austenite phases in high densities, still have a very niche and limited application area due to their cost and production process complexity. However, it is expected that the application areas will expand and its fi...

In this study, the effect of the buttering layer (18.5% Cr + 9% Ni) and the chemical composition of the hardfacing filler materials on the microstructure and wear behavior of the structural steel (S355JR) was investigated. The chromium-based hardfacing alloys deposited by shielded metal arc welding (SMAW) have also been investigated to establish th...

In this study, self-shielded flux-cored arc welding (FCAW-S) was performed using a newly developed hardfacing wire with a 2.4 mm diameter that meets the DIN 8555: MF 10 GF 60 G standard without any protective gas. Three-pass welding were applied on S355JR plates at low (320 A) and high (400 A) amperages. Beside the welding performance and the visua...

The aim of this study was to develop plates resistant to ballistic limits by welding on S355JR steel plate with Fe-Cr-C and austenitic electrodes. A total of four different weld coated materials were prepared for ballistic testing. For these four different coatings, E Z Fe 14 (Fe 14), E Fe 16 (Fe16) hardfacing electrodes and E 18 8 Mn R 3 2 (307) a...

The outcome of a welding process relies on various factors, one of which is the heat input at the welded joint. Consequently, the thermal conductivity of the plates to be welded holds significant importance, just like the selection of the welding technique. This research investigates the impact of applying Metal Active Gas (MAG) and Submerged Arc W...

The microstructural and mechanical properties of E2954 super duplex stainless steel weld metal were investigated in this study. The welding method applied in this study is shielded metal arc welding (SMAW). The mechanical properties of the weld were evaluated by hardness, tensile, and impact tests together with microstructural characterization. Aus...

Żeliwo ADI (ang. austempered ductile iron) to materiał, który zyskuje na popularności w różnych branżach przemysłu. W porównaniu do innych materiałów metalicznych, takich jak stal czy aluminium, charakteryzuje się on wysoką wytrzymałością, twardością, właściwościami tłumienia drgań, niższą ceną oraz prostszym procesem produkcyjnym skomplikowanych d...

In this study, effect of Si content in rutile coating of shielded metal arc welding (SMAW) on mechanical properties, especially on impact toughness, is presented. In this investigation, four rutile-coated electrodes of the AWS A5.1 E6013 type were prepared by reducing silicon gradually in their coatings without exceeding the AWS A5.1 and ISO 2560 l...

While many methods were used in the development of armor materials, welding was preferred in this study. Although welding is a process that mainly used for the purpose of joining two parts, it has become one of the methods that directly affect and improve the properties of the parts today. Sufacing is a type of welding method that covering surface...

In this study, S235JR structural steel samples in uncoated condition and coated (shop-primer) in different thicknesses were welded by MAG (Metal Active Gas) welding method, and the effects of these applications on the mechanical and microstructure properties of the material were investigated. In the experimental studies, the first specimen group we...

Kaynak, günümüzde en yaygın olarak kullanılan birleştirme yöntemlerinden biridir. Bu nedenle kaynak yapılacak parçaların güvenliği, kaynaklı birleştirmelerin kullanıldığı tüm yapının güvenilirliği için büyük önem taşımaktadır. Termal dönüşümler ITAB’ın geometrisi ve kaynak nüfuziyetindeki bilgileri sağlar. Bununla birlikte termal dönüşümlerin kontr...

Hybrid welding consists of TIG and MIG welds, simultaneously and in the same direction, applied together in the same welding area, and a double welding arc formed in the specified area. Thus, faster weldability is ensured with lower heat input.In this study, Al6061 is combined with a hybrid welding method consisting of TIG and MIG arc. Welding prop...

Hybrid welding consists of TIG and MIG welds, simultaneously and in the same direction, applied together in the same welding area, and a double welding arc formed in the specified area. Thus, faster weldability is ensured with lower heat input. In this study, AISI 304L materials were first joined with traditional MIG welding methods and then separa...

In this study, microstructure of 12Cr martensitic steel weld metals with different Mo content was investigated. The weld metals with different Mo contents were fabricated by shielded metal arc welding (SMAW). Both of the weld metals with 0.4 Mo and 0.9 Mo have tempered martensite microstructure. While transformation temperatures of the weld metals...

ASTM A743 CA6NM alloy is a martensitic stainless steel typically used in energy industry -runners and hydraulic turbine components- due to its superior toughness, yield and fatigue properties. In both the manufacturing, shielded metal arc welding is applied to join for this grade steels. However, weldability of the steels is limited due to formatio...

In this study, P91 weld metals with different Co contents were fabricated by shielded metal arc welding. To determine of effect of Co addition to P91 weld metal, microstructure and mechanical properties of the weld metals were characterized. While Co addition did not affect to the microstructure significantly, transformation temperatures changed. A...

In this present study, the cold work hardening behavior of AISI 304 austenitic stainless steel has been investigated as a function of stress rate. For this purpose, tensile specimens were cut from coiled 304 stainless steel stripe with 12 mm width and 0.8 mm thickness. Different stress loads performed on each specimen at room temperature. Microstru...

In the present study, effect of tempering temperatures on microstructure and mechanical properties of AISI 9254 spring steel has been investigated. For this purpose, tensile specimens austenitized at 870°C for 30 min and then oil quenched at 80ºC. After quenching, specimens tempered at four different temperatures (250°C, 350°C, 450°C and 550°C) for...