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Öğe Destructive and non-destructive inspection of pipes welded by MIG-MAG technique(2006) Gülenç, B.; Candan, I.; Kahraman, N.In this study, spiral welded steel pipes made of X52 material were butt joined at different positions using full automatic gas metal arc welding (MAG). In order to examine the influence of the torch position on the weldment, the specimens were subjected to destructive (tensile, impact toughness and hardness) and nondestructive (floroskop) testing. Test results showed that position of the torch during welding changed tensile strength and impact toughness. The non-destructive test showed that position of the torch effected weld bead form. Inadequate fusion melting was observed at some positions and at some others positions poor weld root bead was formed.Öğe The influence of some factors on steel/steel bonding quality on there characteristics of explosive welding joints(2004) Acarer, M.; Gülenç, B.; Findik, F.Explosive welding is a solid state process in which controlled explosive detonations force two or more metals together at high pressures. The resultant arrangement is joined with a high quality metallurgical bond. The aim of this study was to investigate of strength of explosive welding metals which had same chemical compositions. In this study, it was taken different welding interfaces (straight, wavy and continuous solidified-melted) with changing explosive welding parameters (stand-off distance (s), explosive loading (R) and anvils). Joined metals were investigated in heat treatment and non heat treatment conditions. Microstructures, microhardness, tensile shear strength and bending test results were reported. Effect of anvil on explosive welding process was evaluated in joining/no joining performance. It was shown that bonding interface changed from straight to wavy structure when explosive loading and stand-off distance were increased. On wavy interface, when explosive loading was increased wavy length and amplitude increased. Results of tensile shear and bending tests showed that heat treated specimens have more strength than which of unheat-treated ones. According to tensile shear test results, straight and wavy interfaces had similar strength. Also, bending zone has shown some cracks after the bending test of unheated specimens. © 2004 Kluwer Academic Publishers.Öğe An investigation into the effect of welding current on the plasma arc welding of pure titanium(2010) Kahraman, N.; Taskin, M.; Gülenç, B.; Durgutlu, A.In the present study, plasma arc welding method was applied to commercial purity titanium using various welding current values. In order to determine the strength of the resulting joints, tensile tests, impact tests and hardness tests were applied. Additionally, optical microscopy examinations were carried out to determine the interface properties of the joints. The work showed that the highest interface strength was obtained for the specimens joined at 65 A. For all the welding parameters, the hardness test results showed that weld metal gave a higher hardness value than heat affected zone and base metal. The microstructure in welded joint consisted of acicular alpha and twins.Öğe Joining of copper and steel plates by shielded metal arc and tig welding methods and investigation of their interface properties(2005) Durgutlu, A.; Kahraman, N.; Gülenç, B.In this study, low carbon steel and copper plates were welded to each other by shielded metal arc and tungsten arc welding processes. Mechanical and microstructural properties of the joints were investigated. Tensile, bending and hardness tests of the welded specimens were conducted. Optical microscopy and SEM studies were carried out, in order to make the microstructural evaluation. During the tensile tests of the welded specimens, fracture occurred in the copper side apart from the weld region. Macro examination of the bended specimens showed no crack and tears. The results showed that hardnesses of the shielded metal arc welded specimens were higher than those of tungsten arc welded samples. However, hardness values of the weld metal were found to be lower than those of the low carbon steel but it was found to be higher than those of the copper side. From the results of metallographic examination, a uniform transition from parent metal to weld metal was observed in the weld region and more grain growth was observed in TIG welding specimens due to higher heat input when compared to the shielded metal arc welded samples.Öğe Wear behaviour of crankshaft journals filled by submerged arc welding(Palladin Institute of Biochemistry of the NASU, 2014) Öztürk, A.A.; Gülenç, B.; Durgutlu, A.; Kahraman, N.In this study, wear behaviour of crankshaft journals filled by a submerged arc welding with different welding wires and powders is investigated. Hardness and microstructure variations in the submerged arc welding are examined. In addition, the amount of weight loss in abrasion samples of filling dry and lubrication ambience is measured under 40 N loads. It is observed that the amount of abrasion decreased with the increase of hardness at a certain point. Thin wire structure is provided for better abrasion resistance, and abrasion decreases with lubrication.
