Abstract
<p><em>Friction stir spot welding (FSSW) is one of the development of solid state welding to joint lightweight materials such as aluminium. In the automotive industry, lightweight materials are needed in the structure of vehicle construction to improve efficiency in vehicles. This research aims to find out how the effect of rotational speed and dwell time on physical and mechanical properties on the weld joint of aluminium 1100 with Zn interlayer addition. Variations used in rotational speed 1000, 1250, 1600 rpm and dwell time 6, 7, 8 s. Pullout fracture occur in tensile tests that are getting bigger with increasing rotational speed and dwell time. The results of SEM and EDS observations showed that the metallurgical bonded zone increased and kept the hook defect away. The spread of Zn in the stir zone area causes the formation of solid Al-Zn phase in a solid solution. The hook defect filled with Zn can minimize cracks that occur, so increased the tensile shear load. The highest tensile shear load value of FSSW AA1100 without Zn interlayer is 3.61 kN, while the FSSW AA1100 with Zn interlayer addition is 4.34 kN.</em></p>
Highlights
The use of lightweight and strong materials is one of the important things, especially in the automotive sector to improve fuel efficiency in vehicles
Friction Stir Spot Welding (FSSW) is a variant of Friction stir welding (FSW) where the tool is not moved in the direction of the joint
Rotational speed is the speed of the tool rotation, while the dwell time is the time needed for the stirring process
Summary
The use of lightweight and strong materials is one of the important things, especially in the automotive sector to improve fuel efficiency in vehicles. Rotational speed is the speed of the tool rotation, while the dwell time is the time needed for the stirring process This parameter determines the mechanical properties of the joint through heat generated, material flow around the pin, and joint geometry. Problems began to emerge when in FSSW welding there was a decrease in joint strength which occurred because some surfaces experienced arches called hooking defects [9]. To overcome this, it can be done with the addition of Zn powder interlayer on the FSSW joint. Macro structure testing is conducted to observe FSSW joint zones and hook defects at each variation of rotational speed and dwell time. Allegations of Zn flow that spread on FSSW joints will be proven with SEM and EDS testing
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