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Bu çalışmada yüzeyi her iki yüzeyi sertleştirilmiş S355J0 yapı çeliği ile aynı kalitede sertleştirilmemiş yapı çeliği bindirme formunda, gazaltı kaynak yöntemiyle (MAG) iki farklı koruyucu gaz kullanarak birleştirilmiştir. Bu birleştirme işlemi ile kaynak dikiş geometrisinin şekillenmesi üzerine koruyucu gazın ve kaynak ağzı işleminin mekanik özelliklere etkisi incelenmiştir. Yapılan bu çalışmada, 10 mm ve 12 mm kalınlığında kullanılan S355J0 malzemeleri gazaltı ark kaynağı (MAG) yöntemi kullanılarak bindirme kaynağı pozisyonunda birleştirilmiştir. Kaynak işlemleri torç yürütme robotu ile gerçekleştirilmiştir. 12 mm kalınlığında kullanılan S355J0 çeliğinin iki yüzeyide sementasyon ısıl işlemi ile sertleştirilmiştir. Yüzeyi sertleştirilmiş malzemenin bindirme kaynağı yapılacak olan bölgesine kaynak ağzı açılarak ve kaynak ağzı olmaksızın deney işlemleri gerçekleştirilmiştir. Çalışmada 1.6 mm SG3 kaynak teli ile 2 farklı koruyucu gaz karışımı (%88Ar+%10CO2 +%2O2 ve %100CO2) kullanılmıştır. Seçilen bu parametrelerle MAG kaynağı yapıldıktan sonra numunelere tahribatlı ve tahribatsız testler uygulanmıştır. Makroyapı incelemelerine göre koruyucu gaz oranlarındaki CO2 miktarının artması ile kaynak nüfuziyetinde de artış olduğu gözlenmiştir. Makroyapı incelemelerinde tespit edilen nüfuziyet artışına paralel olarak çekme dayanımlarında da %59.7 oranında artış gözlenmiştir. Kaynak ağzı açılmadan yapılan kaynak işlemlerinde ise her iki koruyucu gaz ortamında çekme dayanımı değerlerinin düştüğü tespit edilmiştir. Yapılan sertlik testi sonuçlarına göre kaynak ağzı açılmayan numunelerde daha yüksek sertlik değerleri elde edilmiştir. Kaynak ağzı açılan numunelerindeki kaynak metali sertlik değeri 250 HV ölçülürken, kaynak ağzı açılmayan numunelerde yaklaşık olarak 330 HV civarında ölçülmüştür. Ayrıca tüm deney numunelerinde en yüksek sertlik değeri yüzeyi sertleştirilmiş malzemenin sertleştirilmiş bölgesinde ölçülmüş olup bunu sırası ile ITAB, kaynak metali ve 10 mm S355J0 malzemesi takip etmiştir.
In this study, the surface is combined with both surfaces hardened S355J0 structural steel in the same quality non-hardened structural steel laying form, using two different protective gases by the subgasive welding method (MAG). This combination process and the influence of the protective gas and the source mouth process on the mechanical properties on the formation of the reservoir coating geometry has been studied. In this study, the S355J0 materials used in the thickness of 10 mm and 12 mm were combined in the drawing source position using the subgastic arc source (MAG) method. Resource processes are carried out by robots. The two surfaces of the S355J0 steel used with a thickness of 12 mm are hardened by sementation thermal process. The surface of the hardened material was made by opening the source mouth to the area where the source of climbing will be done and without the source mouth, the experimental processes were carried out. The study used 2 different protective gas mixture (%88Ar+%10CO2 +%2O2 and%100CO2) with the 1.6mm SG3 supply chain. With these selected parameters the MAG source was made after the samples were tested with damaging and undestroyable tests. According to macro studies, the increase in the amount of CO2 in the protective gas rates has also been observed as a rise in the source inflation. In parallel with the increase in inflation observed in macro studies, the pull resistance has also increased by 59.7%. In the source processes without opening the source mouth, it was found that the drawing resistance values in both protective gas environments were reduced. According to the hardness test results, higher hardness values have been obtained in samples that do not open the source mouth. The source metal hardness value in the opened mouth samples is measured at 250 HV, while the source mouth samples are measured at approximately 330 HV. Also, the highest hardness value in all experimental samples was measured in the hardened area of the hardened material, followed by ITAB, source metal and 10mm S355J0 material, respectively.
In this study, both surface hardened S355J0 structural steel and unhardened structural steel of the same quality were joined in the form of an overlay, using two different shielding gases by gas metal arc welding method (GMAW). The effects of shielding gas and welding groove on mechanical properties on the shaping of weld seam geometry with this joining process were investigated. In this study, S355J0 materials used in 10 mm and 12 mm thickness were joined in the overlap welding position using the gas metal arc welding (GMAW) method. Welding operations were carried out with a torch drive robot. Experiments were carried out by opening the weld groove to the area of the surface hardened material to be overlap welded and without a weld groove. In the study, 1.6 mm SG3 solid welding wire and 2 different shielding gas mixtures (88%Ar+10%CO2 +2%O2 and 100%CO2) were used. After MAG welding was done with these selected parameters, destructive and non-destructive tests were applied to the samples. According to the macrostructure studies, it was observed that the weld penetration increased with the increase in the amount of CO2 in the mixture. In parallel with the increase in penetration detected in the macrostructure examinations, an increase of 59.7% was observed in the tensile strength. It was determined that the tensile strength values decreased in both shielding gas environments in the welding processes without opening the weld groove. According to the results of the hardness test, higher hardness values were obtained in the samples whose weld groove was not opened. While the weld metal hardness value was measured at 250 HV in the samples with the weld groove, it was measured around 330 HV in the samples without the weld groove. In addition, in all test samples, the highest hardness value was measured in the hardened region of the surface-hardened material, followed by ITAB, weld metal and 10 mm S355J0 material, respectively.
Alan : Fen Bilimleri ve Matematik; Mühendislik
Dergi Türü : Uluslararası
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