Yavuz SUN, Bünyamin ÇİÇEK, Tuna AYDOĞMUŞ, Emine GÜNDOĞDU İŞ

Q345B çeliğinin benzer olmayan çeliklerle kaynağı sonrası mekanik özelliklerin incelenmesi

Bu çalışmada Q345B çeliğinin farklı çeliklerle elektrik ark kaynakyöntemi kullanarak birleştirilmesi ve mekanik özellikleri incelenmiştir.Sıcak haddeleme işlemleri ile üretilmiş olan Q345B çeliği düşük alaşımlıorta gerilmeli mukavemet değerlerine ve oldukça fazla kullanımalanına sahip bir çeliktir. %0.2 den daha az karbon içeren bu çelik%0.55 den daha az oranlarda silisyum, krom ve nikel ihtiva etmektedir.Bu çalışmada, genel olarak termik santrallerde (kazan duvarı gibi)düşük basınç ve düşük sıcaklık alanlarında kullanılan Q345B çeliği;16Mo3 ve P265GH çelikleri ile birleştirilmiştir. Mekanik özelliklerininkarşılaştırmasının kolaylıkla yapılabilmesi için Q345B çeliği aynızamanda kendisi ile de kaynak edilmiştir. Yapılan birleştirmelersonrasında kaynaklı bölgelerden numuneler çıkartılıp mekanik vemetalografik işlemler için hazırlanmıştır. Bütün birleştirmeler sırasıylaçekme, çentik darbe, sertlik ve eğme testlerine tabi tutulmuşlardır.Bunların dışında geçiş bölgelerini gözlemlemek için tüm kaynakdikişlerinden makro görüntüler alınmıştır. Birleştirme işlemlerindedolgu metali olarak E7018 kalite bazik elektrot kullanılmıştır. Tümmekanik testler ilgili standartların şartlarını sağlamış ve tümkaynaklar geçerli bir kaynak olarak tanımlanmıştır

Invetigations of mechanical propertiesafter dissimilar steels post-weld of Q345B steel

In this study, it has been reported that Q345B steel combine with different steels using electric arc welding method and the mechanical properties were investigated. Produced by hot rolling processes, Q345B steel is a low-alloyed medium tensile strength and highly usable steel. The steel used contain less than 0.2% carbon and less than 0.55% silicon, chromium and nickel. In this study, Q345B steel generally used at low-pressure/temperature zones in thermal power plant (boiler wall etc.) is combined with 16Mo3 and P265GH steels. The Q345B steel is welded to make the mechanical properties easy to compare. After joining, specimens were collected from the welded areas and used in the preparation of mechanical and metallographic processes. In this process, all joints were subject to tensile, charpy, hardness and bending tests. In addition, the collection of macro images from welding were used in observation of transition zones which were operated. Electrodes with a basic character cover were used (E7018) as filler metal in the joining processes. All mechanical tests met the requirements of the relevant standards and all welds were identified as valid weld.

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