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Shahid Parvez

Assistant Professor

Faculty

كلية الهندسة
Building 3, 2nd Floor, 2C25
المنشورات
مقال فى مجلة
2013

Effect of different electrode tip angles with tilted torch in stationary gas tungsten arc welding: A 3D simulation

Nash, M. Abid, S. Parvez, D. H. . 2013

In this study, the effect of different tip angles (30°, 60°, 90° and 120°) on the arc and weld pool behavior is analyzed in 2 mm and 5 mm arc lengths with tilted (70°) torch. Arc temperature, velocity, current density, heat flux and gas shear are investigated in the arc region and pool convection and puddle shapes are studied in the weld pool region. The arc temperature at the tungsten electrode is found the maximum with sharp tip and decreases as the tip angle increases. The arc temperature on the anode (workpiece) surface becomes concentrated with increase in tip angle. The arc velocity and gas shear stress are observed large with sharp tip and decreasing as the tip angle increases. Current density on the anode surface does not change with tip angle and observed almost the same in all the tip angles in both 2 mm and 5 mm arc lengths. Heat flux due to conduction and convection is observed more sensitive to the tip angle and decreases as the tip angle increases. The electromagnetic force is slightly observed increasing and the buoyancy force is observed slightly decreasing with increase in tip angle. Analyzing each driving force in the weld pool individually shows that the gas drag and Marangoni forces are much stronger than the electromagnetic and buoyancy forces. The weld pool shape is observed wide and shallow in sharp and narrow and deep in large tip angle. Increasing the arc length does not change the weld pool width; however, the weld pool depth significantly changes with arc length and is observed deep in short arc length. The arc properties and weld pool shapes are observed wide ahead of the electrode tip in the weld direction due to 70° torch angle. Good agreement is observed between the numerical and experimental weld pool shapes.

نوع عمل المنشور
PhD
رقم المجلد
108-109
الصفحات
51-60
مزيد من المنشورات
publications

In order to construct a 3D rotor model, periodicity and Multiple Reference Frame (MRF) strategies were applied to address full Computational Fluid Dynamics (CFD) that incorporate the Reynolds-…

بواسطة M AbdulRaouf, E AlBahkali, S Parvez, A Alnhdi, M Souli, T AlBahkali
2022
تم النشر فى:
Int. Jnl. of Multiphysics
publications

A 3D numerical simulation was conducted to study the transient development of temperature distribution in stationary gas tungsten arc welding with filler wire. Heat transfer to the filler wire and…

بواسطة Shahid Parvez , Md Irfanul Haque Siddiqui, Masood Ashraf Ali, Dan Dobrota
2021
تم النشر فى:
MDPI
publications

Double girder box girder overhead cranes are used for heavy-duty applications in the industry. In this paper, a detailed parametric design optimization of the main girder of box type is performed…

بواسطة Muhammad Abid, Muhammad Hammad Akmal, Shahid Parvez
2008
تم النشر فى:
Springer