Abstract
The high-speed deformation behavior of friction stir-welded thin sheets in AA6082-T6 aluminum alloy, under biaxial balanced stretching, was investigated by means of a hemispherical punch test carried out using direct tension-compression Split Hopkinson Bar. The friction stir welding process was performed on thin sheet blanks using a pinless tool; the rotational and welding speeds were kept constant during process. The dynamic tests were carried out, with a punch speed of 4500 mm/s, at different punch stroke values until failure of the friction stir welded sample. It was seen that failure occurs along the welding line at a dome height about 11% higher than that at the onset of necking. Fractographic analysis shows that deformation is localized in the fracture zone. The results were compared with those obtained on friction stir welded blanks deformed under quasi-static condition in order to evaluate the influence of the loading rate on the weld deformation and fracture mechanisms. It was shown that joints deformed under dynamic loading condition are characterized by a dome height at the onset of necking significantly higher than the one measured under quasi-static condition.
Highlights
The increasing need for environmental impact reduction by manufacturing sustainable products has led motor vehicle manufacturers to use tailor welded blanks in order to obtain lightweight structures and, reduce fuel consumption [1]
The present paper aims at investigating the high-speed deformation of friction stir welded blanks in AA6082-T6 aluminum alloy
FSWed disk-shaped sample; the latter is due to the impact between the deforms the FSWed disk-shaped sample; the latter is due to the impact between the spacer spacer and and the the tightening screwed cap
Summary
The increasing need for environmental impact reduction by manufacturing sustainable products has led motor vehicle manufacturers to use tailor welded blanks in order to obtain lightweight structures and, reduce fuel consumption [1]. Several welding technologies, such as resistance spot, resistance seam, metal inert gas, tungsten inert gas, laser beam and plasma arc welding, can be used to assembly metal sheets [2]. Friction stir welding (FSW) represents an innovative technique used to join low melting point materials [4]. FSW allows for joining blanks without exceeding the melting temperature of workpiece material. The frictional heat developed between tool and workpieces along with that generated by the stirring action of the tool and the adiabatic heating promote a strong plastic deformation of the workpieces and their complex mixing across the weld [5,6]
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