Ugur Arabaci

• Gazi University

Bu çalışmada, kaynaklı imalat yapan işyerlerinde ortaya çıkan kimyasal risk faktörlerinden toz maruziyeti tespit edilmek istenmiş ve bu doğrultuda ölçümler yapılmıştır. Ölçümler Ankara ilinde yer alan metal sektöründe yer alan 15 farklı işyerinde gerçekleştirilmiştir. Ölçümler T.C. Çalışma ve Sosyal Güvenlik Bakanlığı tarafından yetkilendirilmiş ve...

In this study, 1.4718 coded steel surface, which is used especially in the manufacture of automotive valves, is coated with cobalt-based Stellite 1, Stellite F, Stellite 6, and Nickel 60 alloys by the TIG welding method. The samples coated with the specified welding parameters were abraded for 4400 meters on a metal abrasive disc under 10, 25, and...

In this study, we focus on predicting the HAZ, which is a region whose mechanical properties are not clearly known, by modeling factors such as temperature input and heat turbulence, which may have different properties in the welding region. This is important for the safety of welded structures, because if the mechanical and thermal properties of t...

This study, it was aimed to examine the dry sliding wear properties of the tempering and over-tempering heat treatments of 25CrMo4 steel, which is used in the manufacture of parts such as axle shafts, axle sleeves, turbine parts, and turbine blades in the automotive industry Oil-quenched 25CrMo4 steels could be subjected to high temperatures where...

Bu çalışmada Ankara ilinde metal sektöründe faaliyet gösteren ve gaz altı, toz altı ve/veya örtülü elektrot ark kaynak işi ile çalışma yürüten 15 farklı işyerinde iş sağlığı ve güvenliği koşullarının belirlenmesi adına iş hijyeni fiziksel etkenlerinden termal konfor maruziyeti ölçülmüştür. Ölçümler, ilgili mevzuat kapsamında yetkilendirilmiş ve akr...

Bu çalışmada Ankara ilinde metal sektöründe faaliyet gösteren ve gaz altı, toz altı ve/veya örtülü elektrot ark kaynak işi ile çalışma yürüten 15 farklı işyerinde iş sağlığı ve güvenliği koşullarının belirlenmesi adına iş hijyeni fiziksel etkenlerinden termal konfor maruziyeti ölçülmüştür. Ölçümler, ilgili mevzuat kapsamında yetkilendirilmiş ve akr...

Bu çalışmada Ankara ilinde metal sektöründe faaliyet gösteren ve gaz altı, toz altı ve/veya örtülü elektrot ark kaynak işi ile çalışma yürüten 15 farklı işyerinde iş sağlığı ve güvenliği koşullarının belirlenmesi adına iş hijyeni fiziksel etkenlerinden kişisel gürültü maruziyeti ölçülmüştür. Ölçümler, ilgili mevzuat kapsamında yetkilendirilmiş ve a...

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...

In this study, S235JR structural steel with/without primer in different thicknesses has been welded with submerged arc welding and effect of primer coating on the mechanical and microstructural properties has been investigated. During the study two different batch of test samples has been prepared, both are sand blasted to Sa 2 ½ and one of the bat...

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...

In this study, bainitic microstructure was formed via heat treatmenton R260 rail steel, which is generally used in railways. Bainitic steel, which is considered more advantageous than current rail steel, waswelded by flash butt welding, which is often used for joining rails andthe mechanical and microstructure of the samples were thenexamined and c...

Bu çalışmada, AISI 304, AISI 430 paslanmaz çelikleri ile AISI 1050 tip çeliğe yakma alın kaynağı uygulanmış ve bu uygulamanın malzemelerin mekanik ve mikroyapı özellikleri üzerine etkileri araştırılmıştır. Birleştirilen numunelerin sertlikleri, çekme mukavemetleri ve mikroyapı özellikleri incelenerek birbirleri ile mukayeseleri yapılmıştır. Deney ç...

In this study, effects of holding in liquid nitrogen and cryogenic methods applied onto the SAE 4140 steel were empirically investigated. In this context, austempering, holding in liquid nitrogen, the conventional cryogenic process and tempering processes were applied in different orders and combinations. The temperature of the samples to be temper...

AISI 304 stainless steel plates are widespreadly used in automotive, food and chemical industries. These materials are joined by resistant spot welding. Mechanical properties of resistant spot-welded sheets are changed by using different cooling conditions after welding process. In this study, the effects of current intensity and cooling conditions...

In this study, commercially pure (99.5 wt.-%) copper alloy plates were brazed using an oxy-gas flame with four different brazing alloys in butt and lap joints, and the brazing capability, the microstructural and mechanical property changes were examined. The experimental results showed that L-CuZn39Sn brazing wire used in the butt joining caused po...

Abrasion behaviors under different loading conditions in 1.4718 coded steel, the surfaces of which are coated by TIG welding method with the alloys Stellite F, Stellite 1, Stellite 6 and Nickel 60 are modeled by FL method in this study, based on the study previously done experimentally. As experimental study, the surface-coated samples were subject...

In this study X40CrMoV5 1 [H13] hot-work tool steel and Ç1030 plain carbon steel were welded to each other by using flash butt welding. Post weld normalization heat treatment was applied to one group of the test specimens welded under 2 bars of upsetting pressure and 1.6, 1.8 and 2 s of upsetting current times. Test results demonstrated that the hi...

In this study, a pair of X40CrMoV5 1 (H13) hot working tool steel and Ç1030 (SAE1030) plain carbon steel were welded to each other by using flash butt welding method. During the experimental study the pressure was set to 2 bars and upsetting current times were chosen as 1,6; 1,8 and 2 seconds. The suitable welding parameters were chosen by examinin...

In this study, a pair of 16MnCr5 chain steel was welded to each other by using flash butt welding method. During the experimental study the pressure was set to 2 Bars and upsetting current times were chosen as 1.6, 1.8 and 2 seconds. The samples were welded under these test conditions. Some of the welded samples was subjected to full annealing heat...