S235 Yapı Çeliğinin Tozaltı Kaynağında Toz Türünün Mekanik ve Mikroyapısal Özelliklere Etkileri

S235 ince taneli yapı çelikleri; bilhassa akma mukavemeti değerlerinin en az 235 megapaskal istendiği yapılar, fabrikalar ve makine parçalarında tercih edilmektedir. Düşük alaşımlı çelik gruplarında sınıflandırıldıklarından bu alaşımların fiyatlarının ucuz oluşu tüketimlerinin artmasını da beraberinde getirmiştir. Bu çalışmada; 15 mm kalınlığındaki S235 Yapı çeliği 2 farklı kaynak tozu kullanılarak tozaltı kaynak yöntemiyle kaynak edilmiştir. Kaynak tozu bileşiminin kaynak edilmiş S235 çelik alaşımının mikro-yapısal ve mekanik özellikleri üzerindeki etkileri incelenmiştir. Bu iki tür kaynak tozunun karşılaştırılması amacıyla; ana malzeme ve kaynaklı bağlantının ısının tesiri altındaki bölgeleri ve kaynak metalinin mikro-vikers sertlik taramaları, enine çekme deneyleri, mikroyapısal incelemeler uygulanmıştır.

Anahtar Kelimeler:

İnce taneli yapı çelikleri, S235 çelik alaşımı, tozaltı kaynağı, kaynak tozları

The Effects of Flux Type on Mechanical and Microstructural Properties of S235 Structural Steel by Submerged Arc Welding

S235 fine grained steel alloys are demanded especially in structural components of buildings, factories and mechanical parts of machines where yield strength values approximately close to minimum 235 mega-pascals are in concern. As they are classified in low alloyed steel groups, in consequence of the cheapness of these alloys their consumption is increasing as well. In this work; 15mm of S235 structural steel is submerged arc welded by 2 types of welding fluxes. The effects of flux composition on microstructural and mechanical properties of welded S235 steel alloy are examined. Micro-vickers hardness surveys of base metal and heat affected zones with weld metals, transverse tensile tests and micro-structural investigations are applied for comparison of these two types of welding fluxes.

Keywords:

Fine grained steel alloys, S235 steel alloy, Submerged arc welding, Welding fluxes,

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