A STUDY AND ANALYSIS OF FSW WITH DISSIMILAR ALUMINIUM ALLOYS AA7075 AND AA3014

Abstract

Friction Stir Welding (FSW) may be a solid state welding process during which the relative motion between the tool and therefore the work piece produces heat which makes the material of two edges being joined by plastic atomic diffusion. This method relies on the direct conversion of energy to thermal energy to make the weld without the appliance of warmth from conventional sources. The rotational speed of the tools, the axial pressure, welding speed and therefore the tool profile are the principal variables that require to be controlled so as to produce the required combination of warmth and pressure to make the weld. The scope of this investigation is to guage the effect of joining parameter on the mechanical properties of dissimilar aluminium alloys AA3104 and AA7075 joints produced by Friction Stir welding using CNC vertical machining centre. The Brinnel hardness and durability of the joints are considered for the investigation. The results show that for optimal stir zone hardness, FSW parameter combination of 1200 rpm tool rotational speed, 10 mm/min welding speed and cylindrical tool profile should be used. For optimal joint durability, the acceptable parameters combination is 1200rpm, 20mm/min and taper thread tool profile. From the investigation, it's concluded that tool
rotational speed is the major influencing factor for mechanical properties like durability and hardness.