4 results listed
In this study, many operations carried out by
traversing laser beam on 6 mm thick S960 steel plates for various
laser welding speeds and powers in order to determine influence
of welding speed and power on penetration, shape of fusion zone
and heat affected zone. A 16 kW Ytterbium fibre laser and pure
argon as shielding gas were used in this experimental study. Data
was evaluated and compared with some previous studies.
Furthermore, an empirical formula between heat input and weld
bead width was developed from results.
International Iron & Steel Symposium
UDCS
Ömer Ekinci
John Francis
Anıl İMAK
Zülküf BALALAN
The purpose in this study was to investigate the effects of keyhole laser welding parameters (laser beam power, laser welding speed, and heat input) on weld bead shape and integrity such as fusion zone and heat affected zone. Hence, butt-joint keyhole laser welding practices were conducted on S700 steel plates thickness of 13 mm by applying various laser beam power and welding speed with a 16 kW Ytterbium fibre laser and using pure argon as shielding gas in the Mechanical Engineering Laboratory of The University of Machester. The weld crosssections were examined under an optical microscope and widths of fusion zone, coarse grained heat affected zone and intercritical heat affected zone were measured and also defects that occurred during welding were determined based on laser beam power and welding speed. As a result, effects of laser beam power and laser welding speed on fusion zone width and heat affected zone width were plotted and results were compared with previous studies published.
International Iron & Steel Symposium
UDCS
Ömer Ekinci
John Francis
Zülküf BALALAN
In this investigation, a gas tungsten arc welding (GTAW) is used as a high energy density beam to form a coated surface over 0.15% C carbon steel with FeB, FeTi and graphite powders. The microstructure, microhardness and dry-sliding wear behavior of the composite coating were investigated by using optical micrograph (OM), X-ray diffraction (XRD), scanning electron micrograph (SEM), energy dispersive X-ray analysis (EDS), microhardness tester and adhesive wear tester. A lot of types of carbide and borides were formed. The shape of the graphite present in the FeBFeTi-C composite TIG welding coatings is various from sheet-like to triangle. Within the wear test conditions used in the present research, on Fe2B coated samples wear was essentially oxidative until the failure of the coating.
International Iron & Steel Symposium
UDCS
Mehmet YAZ
SERDAR OSMAN YILMAZ
Zülküf BALALAN
In this work, thermal cycles were applied to samples of CuAl10Fe aluminum bronze alloy which are commonly used in marine hardware, shipping and journal bearings. The samples were maintained in heat treatment furnace at 950 oC (for 30 minutes) and cooled after than subjected to aging process by storing in heat treatment furnace (at 100 oC and 150 oC) for different times (8, 10 and 12 hours). Therefore, aged samples of the data on microhardness and wear resistance values were compared to non-aged base sample depending on the microstructural transformation. As a consequence of this, there is an important increasing at aged samples of microhardness and wear resistance values when comparing with non-aged base sample.
International Iron & Steel Symposium
UDCS
Zülküf BALALAN
Furkan SARSILMAZ
Anıl İMAK
Niyazi ÖZDEMİR
Ömer Ekinci