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Welding technologies; automotive, transportation, steel construction, machine manufacturing, iron and steel sector, pipe sector, ship construction, power plants, mining sector, defense industry etc. has a strategic importance in many sectors. The role of welding as a locomotive in the industry is of great importance both for its development and its progress. Turkey, in accordance with the needs of the market, keeping up with constantly evolving technology, have high competitiveness, good quality and affordable welding wire, welding electrode, skilled electrodes, soldering wires and it can increase the export capacity by producing welding machines of various capacities. Due to the presence of large-scale welding wire and covered electrode producers in the domestic market with economies of scale, high tonnage raw material purchasing power, warehouse and storage capacities cause the iron-steel mills of the wire rod manufacturer to focus on these firms. Small and medium sized new entrepreneurs are ignored by these producers due to their insufficient purchasing and storage capacities. Therefore, new entrepreneurs cannot enter the market, causes prices in the domestic market are increasing. This increase leads consumer and manufacturer firms that demand low price products to Far Eastern companies' products. In the resource sector, while access to European standards and quality in Turkey, both producer and consumer reduce the competitive strength of the company. Reduce the share of Far Eastern products in the domestic market and large suppliers of wire rods to increase the production of materials such as welding electrodes, welding wires, solder wires, etc., must meet the reasonable demands of small and medium sized entrepreneurs. The market price balance of the welding consumables will be ensured thanks to the new small and medium sized new entrepreneurs. The new price balance, by reducing imports of far-eastern products has captured the European quality standards and will contribute to Turkey's exports of welding consumables.

International Iron & Steel Symposium
UDCS

Soner ÇETİN Volkan Temizkan

It is called superstructure member rail which is made of cast steel which guides the wheels on the railway vehicles and transverses the forces coming from the axles to sleepers. The fish plate used in joining the rails; cause noise, prevent acceleration, increase repair costs, cause damage in vehicles, cause rail to break etc. it is due to the reasons for the rails welding. Rails usually welded by alumino-thermit rail welding, flash butt welding and electric arc welding methods. Alumino-thermit welding based on the removal of heavy metals by the aluminum of heavy metal oxides. In the flash butt welding method is the rail ends are heated to the melting point with the electrical resistance system without any additional elements then pressure is applied to the molten rail ends so that the rails are welded. In this study, hardness properties, optical and SEM images of alumino-thermit and Flash butt welded S49 rails were investigated. In the optical and SEM microstructure examination, the perlitic structure was generally observed in the source region of the sample to which the burn-in source was applied, while the decarburized regions were observed in the source region of the sample to which the thermit source was applied. Low stiffness values were obtained in the fungus and I profile regions of the rail specimen subjected to the effect of decarburized regions and of the rail specimens subjected to thermit welding compared to the burn-in origin specimen.

International Conference of Advanced Materials and Manufacturing Technologies
ICAMT

Harun ÇUĞ Soner ÇETİN Mustafa DURSUNLAR Hayrettin AHLATCI M. Hüseyin ÇETİN