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    Flux cored arc welding on 30MnB5 steels used in agricultural mechanisation: microstructure evolutions and mechanical properties
    (Springer India, 2021) Cevik, Bekir; Sahin, Omer; Gulenc, Behcet
    30MnB5 steel has taken its rightful place among the materials used in agricultural mechanisation industry due to its excellent mechanical properties. 30MnB5 steel is widely used especially in structural parts requiring hardness, strength and wear resistance. The increasing importance of economic factors in today's industry requires the production of long-lasting agricultural machineries in agricultural mechanisation. Agricultural machinery systems are set-up by assembling the materials used in agricultural mechanisation industry with each other. Therefore, it is important to apply welding process to this steel used in agricultural mechanisation. The number of studies on the use of various welding methods and consumables (electrode, welding wire, shielding gas, etc.) in welding of steels used in agricultural mechanisation continues increasingly today. Flux-cored arc welding technology is one of welding methods that have been mostly studied in recent years and are applied on various metals. In this study, 30MnB5 steel sheets were flux-cored arc welded using rutile and basic flux-cored wires in 100% CO2 atmosphere. Bending, impact, and hardness tests and metallographic examinations were carried out in order to determine the mechanical and microstructural properties of the welded samples. As a result of the microstructure studies, structures such as grain boundary ferrite, widmanstatten ferrite, acicular ferrite, bainite, and martensite were determined in the weld metal and HAZ. As a result of the hardness test, hardness distribution in the form of M was determined in the weld zones. The bending and impact tests indicated that the highest mechanical properties were obtained from the weld seams welded with basic flux-cored wire.
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    Weldability of dissimilar stainless steels by MIG welding with different gas combinations
    (Springer India, 2023) Acar, Ismail; Cevik, Bekir; Gulenc, Behcet
    Stainless steels have been increasingly used for agricultural and food processing, biogas, architecture, automotive, machine-manufacturing, biomedicine, chemical, and petrochemical industry due to their corrosion resistance and sanitary qualities. Dissimilar stainless steels may need to be utilized together in various fields due to their different properties. Therefore, it is important to weld dissimilar stainless steel, which are employed in these fields, with strong mechanical properties. However, the requirement to join many metals, each of which has different properties, on the same construction may result in the emergence of some problems. The properties of the weld zone as well as the quality of the welded joints depend on the selection of the optimal welding parameters and the kind of shielding gas. Therefore, estimating the quality and service life of dissimilar stainless steel joints requires to understand the weld zone's properties better. Therefore, it is important to investigate the effect of shielding gases and gas combinations on the welding of dissimilar stainless steels in the welding process. In this study, AISI 316 austenitic stainless steel and AISI 430 ferritic stainless steel were joined utilizing the metal inert gas (MIG) welding with different shielding gas combinations. In welding processes, 100% Ar, 97% Ar+3% H-2, and 93% Ar+7% H-2 gas combinations were used. The welded sheets were subjected to hardness, tensile, and bending tests in addition to metallographic testing. The effects of the shielding gas combinations on the mechanical and microstructural properties of AISI 316 austenitic and AISI 430 ferritic stainless steel connections were investigated through these tests.