Hemijska industrija 2015 Volume 69, Issue 3, Pages: 323-330
https://doi.org/10.2298/HEMIND131206020R
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Influence of pin geometry on mechanical and structural properties of butt friction stir welded 2024-T351 aluminum alloy
Radisavljević Igor Z. (Military Technical Institute, Belgrade)
Živković Aleksandar B. (GOSA FOM, Smederevska Palanka)
Grabulov Vencislav K. (Institute for Materials Testing, Belgrade)
Radović Nenad A. (Faculty of Technology and Metallurgy, Belgrade)
The aim of this work was to investigate the combined effect of small
difference in pin geometry, together with rotation and welding speed on the
weldability, mechanical and structural properties of FSW 2024-T351 Al
plates. The only difference in tool pin design was the shape of thread:
regular and rounded. Specimens were welded using rotation rate of 750
rev/min and welding speeds of 73 and 93 mm/min. In all four cases, specimens
were defect free, with good or acceptable weld surface. Modification in pin
design showed strong influence on macro structure and hardness distribution.
Weak places are identified as low hardness zone, close to the nugget zone
and are in good agreement with fracture location in tensile testing. Weld
efficiency, as a measure of weld quality, are better in case of 310 tool,
while UTS values can differ up to 13% for the equal welding parameters.
Therefore, it can be assumed that small modification in tool design,
particularly in pin geometry, can have great influence on weld formation and
mechanical properties.
Keywords: Friction Stir Welding, pin geometry, weld quality, Al alloy 2024, heat input