Bobbin Tool Friction Stir Welding of Aluminum Thick Lap Joints: Effect of Process Parameters on Temperature Distribution and Joints’ Properties
| Autor: | Mohamed M. El-Sayed Seleman, Sabbah Ataya, Mohamed M. Z. Ahmed, K. Hajlaoui, Fahamsyah H. Latief, Ahmed El-Nikhaily, Mohamed I. A. Habba |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
bobbin tool
Technology Materials science Bobbin Welding mechanical properties Article law.invention law Ultimate tensile strength Friction stir welding General Materials Science pin geometry Composite material Tensile testing Microscopy QC120-168.85 QH201-278.5 Rotational speed travel speed Engineering (General). Civil engineering (General) welding temperature TK1-9971 AA1050-H14 Lap joint Descriptive and experimental mechanics Fracture (geology) Electrical engineering. Electronics. Nuclear engineering TA1-2040 |
| Zdroj: | Materials Materials, Vol 14, Iss 4585, p 4585 (2021) Volume 14 Issue 16 |
| ISSN: | 1996-1944 |
| Popis: | Bobbin tool friction stir welding (BT-FSW) is characterized by a fully penetrated pin and double-sided shoulder that promote symmetrical solid-state joints. However, control of the processing parameters to obtain defect-free thick lap joints is still difficult and needs more effort. In this study, the BT-FSW process was used to produce 10 mm AA1050-H14 similar lap joints. A newly designed bobbin tool (BT) with three different pin geometries (cylindrical, square, and triangular) and concave shoulders profile was designed, manufactured, and applied to produce the Al alloy lap joints. The experiments were carried out at a constant tool rotation speed of 600 rpm and a wide range of various welding travel speeds of 200, 400, 600, 800, and 1000 mm/min. The generated temperature during the BT-FSW process was recorded and analyzed at the joints’ center line, and at both advancing and retreating sides. Visual inspection, macrostructures, hardness, and tensile properties were investigated. The fracture surfaces after tensile testing were also examined. The results showed that the pin geometry and travel speed are considered the most important controlling parameters in BT-FSW thick lap joints. The square (Sq) pin geometry gives the highest BT-FSW stir zone temperature compared to the other two pins, cylindrical (Cy) and triangular (Tr), whereas the Tr pin gives the lowest stir zone temperature at all applied travel speeds from 200 to 1000 mm/min. Furthermore, the temperature along the lap joints decreased with increasing the welding speed, and the maximum temperature of 380 °C was obtained at the lowest travel speed of 200 mm/min with applying Sq pin geometry. The temperature at the advancing side (AS) was higher than that at the retreating side (RS) by around 20 °C. Defect-free welds were produced using a bobbin tool with Cy and Sq pin geometries at all the travel welding speeds investigated. BT-FSW at a travel speed of 200 mm/min leads to the highest tensile shear properties, in the case of using the Sq pin. The hardness profiles showed a significant effect for both the tool pin geometry and the welding speed, whereas the width of the softened region is reduced dramatically with increasing the welding speed and using the triangular pin. |
| Databáze: | OpenAIRE |
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