Ihsan Kirik

Microstructure and Mechanical Behaviour of Friction Welded AISI 2205/AISI 1040 Steel Joints

Abstract The goal of this study is to investigate the effect of friction time on mechanical and microstructural properties of dissimilar AISI 1040/AISI 2205 stainless steel couples. The experiments were carried out with continuous drive friction welding set-up. Friction welding experiments with different frictional times and constant friction pressure as well as rotational speed were carried out. The strength of the welds was determined by tensile strength tests. Hardness variation of the joint was also obtained. The results were compared with those of previous studies. The results of applied tests and observations showed that the properties of microstructure change and that the interface temperature increases with friction time. The best tensile strength of the joint was observed for the specimen welded at 1700 rpm rotation speed and a friction time of 3 s.

The Effect of Plasma Arc Process Parameters on the Properties of Dissimilar AISI 1040/AISI 304 Steel Plate Welds

Abstract In this study, 10 mm thick AISI 1040 and AISI 304 steel plates were welded in the butt position without pretreatment by plasma transferred arc (PTA) welding technique. Therefore, mechanical behaviour, microstructure, penetration depth and length were investigated. After welding, microstructural changes in the interface regions of the welded specimens were examined by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Micro-hardness as well as V-notch Charpy tests were performed to determine the mechanical properties of the welds. The influence of the welding parameters on the dimension and shape of the joints has been found out. From the results, it was derived that with the parameters used, a partly keyhole weld bead formed with a penetration depth of 10 mm and a width of 11 mm in butt position.

Weldability of AISI 304 to Copper by Friction Welding

Abstract Friction welding is a solid-state welding method, which can join different materials smoothly and is excessively used in manufacturing industry. Friction welding method is commonly used in welding applications of especially cylindrical components, pipes and materials with different properties, for which other welding methods remain incapable. AISI 304 stainless steel and a copper alloy of 99.6 % purity were used in this study. This couple was welded in the friction welding machine. After the welding process, samples were analyzed macroscopically and microscopically, and their microhardness was measured. Tensile test was used to determine the bond strength of materials that were joined using the friction welding method. At the end of the study, it was observed that AISI 304 stainless steel and copper could be welded smoothly using the friction welding method and the bond strength is close to the tensile strength of copper.

Microstructure and mechanical properties of friction welded AISI 1040/AISI 304L steels before and after electrochemical corrosion

Abstract The aim of the present study is to investigate the effect of welding parameters both on the electrochemical corrosion behavior and tensile strength of pre- and post-electrochemical corrosion of friction welded dissimilar steels. The microstructural changes of AISI 1040/AISI 304L friction welded couples and also parent materials were analyzed by using scanning electron microscopy. The electrochemical behaviors of AISI1040/AISI304L joints were comparatively investigated by potentiodynamic polarization curve test and by electrochemical impedance spectra. Moreover, tensile strength experiments were carried out determining the behavior of friction welded joints of pre- and post-electrochemical corrosion and results indicated that the maximum tensile test value of the dissimilar welded pre-electrochemical corrosion was higher than those of post-electrochemical corrosion and was also very close to AISI 1040 parent material value.

Weldability of duplex stainless steels with and without Cu/Ni interlayer using plasma arc welding

Abstract The aim of this study is to investigate the effect of a monel/nickel interlayer electrode prepared with a thickness of 2 mm on the weldability properties of duplex stainless steel plates welded by means of plasma transfer arc welding. After welding, scanning electron microscopy, X-ray diffraction and energy dispersive spectrometry were carried out to determine the microstructural changes that occurred in the interface regions of the welds. Moreover, tensile strength, microhardness and fractography tests were conducted for assessing the mechanical properties of the welded specimens. The results of tests and examinations indicated that the tensile strength of welded parts with a nickel interlayer was higher than that of with and without a monel interlayer.

Effect of temperature on microstructure and mechanical behavior of diffusion bonded Armor 500 and AISI 1040 steels

Abstract The purpose of this study is to join Armor 500 steel and medium carbon steel (AISI 1040) by using diffusion welding and to experimentally examine the effect of welding temperature on microstructure and mechanical properties. Diffusion welded joints were performed at 700, 800, 900 and 1000 °C, under a pressure of 3 MPa and for a welding period of 30 minutes. In order to determine the structural changes occurring in the joint zone; SEM and EDS analyses were conducted. Also, microhardness and overlapping shifting tests were carried out in order to determine the mechanical behaviors. Based on the experiment results, it was observed that welding temperature had an important effect on the strengths of diffusion welded joints. Consequently, it was determined that a sample joined at 900 °C had a strength of 960 MPa.