scholarly journals EFFECT OF CONICAL TAPERED TOOL PIN PROFILE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF FRICTION STIR WELDED DISSIMILAR METALS

2017 ◽  
Vol 4 (10) ◽  
Keyword(s):  
Mechanical Properties ◽  
Dissimilar Metals ◽  
Friction Stir ◽  
Tool Pin Profile ◽  
Microstructure And Mechanical Properties ◽  
Tool Pin

Effect of tool pin profile on the microstructure and mechanical properties of friction stir processed Al6061/Al2O3—TiB2 surface hybrid composite layer

2017 ◽  
Vol 233 (5) ◽  
pp. 900-912 ◽  
Author(s):  
Vahid M Khojastehnezhad ◽  
Hamed H Pourasl ◽  
Reza Vatankhah Barenji
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Hybrid Composites ◽  
Composite Layer ◽  
Uniform Structure ◽  
Tool Geometry ◽  
Friction Stir ◽  
Tool Pin Profile ◽  
Microstructure And Mechanical Properties ◽  
Tool Pin

The Al6061/Al2O3–TiB2 surface hybrid composites were produced using friction stir processing. The effect of the tool pin profile was investigated on the microstructure and mechanical properties including hardness and wear resistance. For this purpose, simple cylindrical, threaded cylindrical, taper, square, and triangular pin profiles were used. X-ray diffraction analysis and transmission electron microscopy were used to characterize the used powder. Light and scanning electron microscopes were utilized for the microstructural observations of the processed samples. The results showed that the distribution of Al2O3–TiB2 particles in the specimens produced using square and triangular tool pin profiles was more uniform due to their tool geometry, which results in better stirring of the material and good material flow. Consequently, a greater reduction of particle clustering was observed, and hence the mechanical properties were enhanced. Moreover, the samples produced using square and triangular pin profiles exhibited more grain refinement than the other samples. More uniform structure, less clustering, and finer grains produced by square and triangular pin profiles caused higher hardness and wear resistance of the samples.

Effects of friction stir welding on corrosion and mechanical properties of AA6063 in sea water

2021 ◽  
pp. 095440622199554
Author(s):  
Laxmana Raju Salavaravu ◽  
Lingaraju Dumpala
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Friction Stir Welding ◽  
Corrosion Rate ◽  
Rotational Speed ◽  
Traverse Speed ◽  
Tool Rotational Speed ◽  
Friction Stir ◽  
Tool Pin Profile ◽  
Tool Pin

Submerged friction stir welding (FSW) is used to improve the weld zones mechanical properties in the present study. This research aims to obtain the optimized process parameters used to fabricate the AA6063 Submerged FSW joint. In the Submerged FSW process, the most important influential factors are tool rotational speed, traverse speed, and pin profile in a seawater environment. The different workpieces are friction stir welded while submerged in seawater at different tool rotational speeds, traverse speeds, and tool pin profiles such as square pin, cylindrical taper pin, and threaded pin. The produced weldments were tested for the mechanical properties of higher tensile strength, microhardness, corrosion rate, and the microstructure of weldments was characterized by using a scanning electron microscope, transmission electron microscope, and X-ray diffractometer. The corrosion rate is investigated by using an electrochemical analyzer by potential dynamic polarization open-circuit technique. For this investigation, The Taguchi method with the L9 orthogonal array design of experimentation is adopted. The maximum UTS was acquired in the weld joint fabricated with 1250 r/min of tool rotational speed, 45 mm/min traverse speed, and a square tool pin. The stirred zone is tested for microhardness. High hardness is achieved with high tool rotational speed and low traverse speed with a square tool pin profile. The corrosion rate is also decreased with high tool rotational speed, low traverse speed, and a square tool pin profile.

scholarly journals Effect of Tool Geometry and Welding Speed on Mechanical Properties and Microstructure of Friction Stir Welded Joints of Aluminium Alloys AA6082-T6

2014 ◽  
Vol 61 (3) ◽  
pp. 455-468
Author(s):  
Hiralal Subhash Patil ◽  
Sanjay N. Soman
Keyword(s):  
Mechanical Properties ◽  
Welding Speed ◽  
Welded Joints ◽  
Aluminium Alloys ◽  
Tensile Tests ◽  
Tool Geometry ◽  
Welding Parameters ◽  
Friction Stir ◽  
Tool Pin Profile ◽  
Tool Pin

Abstract Friction stir welding is a solid state innovative joining technique, widely being used for joining aluminium alloys in aerospace, marine automotive and many other applications of commercial importance. The welding parameters and tool pin profile play a major role in deciding the weld quality. In this paper, an attempt has been made to understand the influences of welding speed and pin profile of the tool on friction stir welded joints of AA6082-T6 alloy. Three different tool pin profiles (tapered cylindrical four flutes, triangular and hexagonal) have been used to fabricate the joints at different welding speeds in the range of 30 to 74 mm/min. Microhardness (HV) and tensile tests performed at room temperature were used to evaluate the mechanical properties of the joints. In order to analyse the microstructural evolution of the material, the weld’s cross-sections were observed optically and SEM observations were made of the fracture surfaces. From this investigation it is found that the hexagonal tool pin profile produces mechanically sound and metallurgically defect free welds compared to other tool pin profiles.

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