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The Effect of Joining Process on Mechanical Properties of Structural Steels
(Natl Acad Sciences Ukraine, Inst Metal Physics, 2010) Gülenç, Behçet; Uygur, I.; Tuncer, E.; Durgutlu, A.; Kap, T.; Uzunoğlu, M.
Welding of structural steels is extensively used in various fields. In general, welding of these steels does not pose any problems. They may be welded with almost all well-known welding techniques. Different chemical contents of these steels and their joining methods may affect the mechanical properties and microstructure of the materials. In this study, AISI 1020-ASTM A514 steels have been welded by MMAW (MMAW manual metal arc welding), MIG (MIG-metal inert gas), MAG (MAG-metal arc gas) and TIG (TIG-tungsten inert gas) welding. Tensile tests, bending tests and hardness measurements have been carried out. The material microstructure has been investigated by means of optical microscopy in order to characterize the effect of processing parameters on the joints quality. The highest tensile strength and hardness values have been obtained for the MAG welded couples, while the lowest values have been obtained for the TIG welded materials. These changes have been explained with reference to the microstructure changes.