scholarly journals Effect of Different Tool Probe Profiles on Material Flow of Al–Mg–Cu Alloy Joined by Friction Stir Welding

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6296
Author(s):  
Anton Naumov ◽  
Evgenii Rylkov ◽  
Pavel Polyakov ◽  
Fedor Isupov ◽  
Andrey Rudskoy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Dynamic Viscosity ◽  
Material Flow ◽  
Mechanical Performance ◽  
Strain Rates ◽  
Friction Stir ◽  
Cu Alloy ◽  
First Case ◽  
Positive Effect

Friction Stir Welding (FSW) was utilized to butt−join 2024–T4 aluminum alloy plates of 1.9 mm thickness, using tools with conical and tapered hexagonal probe profiles. The characteristic effects of FSW using tools with tapered hexagonal probe profiles include an increase in the heat input and a significant modification of material flow, which have a positive effect on the metallurgical characteristics and mechanical performance of the weld. The differences in mechanical properties were interpreted through macrostructural changes and mechanical properties of the welded joints, which were supported by numerical simulation results on temperature distribution and material flow. The material flow resulting from the tapered hexagonal probe was more complicated than that of the conical probe. If in the first case, the dynamic viscosity and strain rate are homogeneously distributed around the probe, but in the case of the tapered hexagonal probe tool, the zones with maximum values of strain rates and minimum values of dynamic viscosity are located along the six tapered edges of the probe.

Effect of Friction Stir Welding pin Shape on Mechanical Properties of AA6061 Alloy Weldment

2013 ◽  
Vol 465-466 ◽  
pp. 1309-1313
Author(s):  
Mohd Hasbullah Idris ◽  
Mohd Shamsul Husin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Material Flow ◽  
Weld Line ◽  
Butt Joint ◽  
Hardness Distribution ◽  
Plunge Depth ◽  
Friction Stir ◽  
Joint Properties

The present study is aimed to determine the effect of friction stir welding pin; square and diamond shape on mechanical properties of butt joint AA6061 weldment. Welding was carried out at different plunge depths of 0.0, 0.2, 0.3 and 0.4 mm together with rotation and transverse speeds of 500 rpm and 40 mm/min, respectively. Material flow, tensile strength and hardness of the weldment were evaluated. The results indicated that joint properties were significantly affected by tool design. It was found that material flow was higher for diamond pin tool compared to that of square pin resulting in considerable increased in tensile strength of the joint. In addition, the highest tensile strength was obtained on the samples welded with square shape pin at 0.4 mm plunge depth whilst the lowest was by diamond shape at the plunge depth of 0.0 mm. Regardless of pin shape and plunge depth; asymmetrical hardness distribution was observed for all weldments. The highest hardness was found to be close to the weld line produced by the diamond shaped pin at 0.0 mm plunge depth.

Effect of friction stir welding parameters on the material flow, mechanical properties and corrosion behavior of dissimilar AA5083-AA6061 joints

2021 ◽  
pp. 095440622110361
Author(s):  
Kethavath Kranthi Kumar ◽  
Adepu Kumar ◽  
MVNV Satyanarayana
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Corrosion Behavior ◽  
Process Parameters ◽  
Material Flow ◽  
Stir Zone ◽  
Friction Stir ◽  
Notch Tensile Strength ◽  
Mechanical Properties And Corrosion

Material flow has a significant impact on the joint properties and is one of the most challenging aspects to be understood in dissimilar friction stir welding. The present study emphasizes the role of process parameters on material flow, mechanical properties and corrosion behavior of dissimilar friction stir welds of AA5083-AA6061. Microstructural analysis revealed that the onion ring sub-layer width observed at the stir zone was substantially changed by varying process parameters. It was understood that the higher rotational speeds promote better intermixing and enhanced mechanical properties. The notch tensile strength values were in correlation with the intermixing of materials at the stir zone and the highest notch tensile strength value was obtained at 1400 rpm and 60 mm/min. A remarkable degree of material intermixing and fragmentation of intermetallics at higher rotational speeds resulted in better corrosion resistance.

Material flow and mechanical properties of friction stir welded Al-Mg-Si alloy: Role of concentric circles shoulder with non-circular pins

2021 ◽  
pp. 095440622198939
Author(s):  
Krishna Kishore Mugada ◽  
Kumar Adepu
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Heat Input ◽  
Material Flow ◽  
Process Conditions ◽  
Friction Stir ◽  
Tool Shoulder ◽  
Average Hardness ◽  
Concentric Circles

Understanding the material flow in friction stir welding (FSW) is one of the challenging aspects for producing defect free and quality welds. The material flow is majorly governed by the tool shoulder/pin geometries and process conditions. In the present study, concentric circles shoulder shape with various polygonal pin designs are selected, and their influence on material flow and mechanical properties in Al 6082 friction stir welds is addressed. Material flow is studied by inserting the markers before welding and subsequent analysis of deformed marker material by radiography and macrostructure after welding. The outcome shows the welds with square pin design facilitated a constant stable force, and hexagonal pin design facilitated a decreasing behavior of force with reference to welding length/time. The heat input is increasing from triangular pin to hexagonal pin and is maximum for welds with hexagonal pins (973 kJ/mm). Further, welds with hexagonal pins (TCC)HEX tool facilitated higher mechanical properties of strength (187 MPa) and average hardness (79 HV) at the stir zone.

scholarly journals New Approaches to Friction Stir Welding of Aluminum Light-Alloys

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 233 ◽  
Author(s):  
Marcello Cabibbo ◽  
Archimede Forcellese ◽  
Eleonora Santecchia ◽  
Chiara Paoletti ◽  
Stefano Spigarelli ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Welding ◽  
Solid State ◽  
Fusion Welding ◽  
Age Hardening ◽  
Forming Limit ◽  
Present Contribution ◽  
Friction Stir ◽  
New Approaches ◽  
First Case

Friction stir welding (FSW) is the most widely used solid-state joining technique for light-weight plate and sheet products. This new joining technique is considered an energy-saving, environment friendly, and relatively versatile technology. FSW has been found to be a reliable joining technique in high-demand technology fields, such as high-strength aerospace aluminum and titanium alloys, and for other metallic alloys that are hard to weld by conventional fusion welding. Several studies accounted for the microstructural modifications induced by solid-state FSW, based on the resulting mechanical properties obtained at the FSW joints, such as tensile, bending, torsion, ductility and fatigue responses. In the last few years with the need and emerging urgency to widen the FSW application fields, broadening the possible alloy systems, and to optimize the resulting mechanical properties, this joining technique was further developed. In this respect, the present contribution focuses on two modified-FSW techniques and approaches applied to aluminum alloys plates. In a first case, an age-hardening AA6082 sheets were double side friction stir welded (DS-FSW). In a second case a non-age-hardening AA5754 sheet was FSW by an innovative approach in which welding pin was forced to slightly deviate away from the joining centreline (defined by authors as RT). In both the cases different pin heights were used, the sheets were subjected to heat treatments (peak hardening T6 for the AA6082, and annealing for the AA5754) and compared to the non-heat treated FSW conditions. Microstructural modifications were characterized by optical microscopy (OM). The mechanical properties were characterized both locally, by nanoindentation techniques, and globally, by tensile (yield, YT; ultimate, UT; and elongation, El) or forming limit curve (FLC) tests. Both the new approaches were directly compared to the conventional FSW techniques in terms of resulting microstructures and mechanical responses.

scholarly journals Effect of Modified Pin Profile and Process Parameters on the Friction Stir Welding of Aluminum Alloy 6061-T6

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
J. C. Verduzco Juárez ◽  
G. M. Dominguez Almaraz ◽  
R. García Hernández ◽  
J. J. Villalón López
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Material Flow ◽  
Flow Behavior ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Friction Stir ◽  
Aluminum Alloy 6061 ◽  
Alloy 6061

This work deals with the effect of a new “bolt-head” pin profile on the friction stir welding performance of the aluminum alloy 6061-T6, compared to traditional pin profiles. Friction stir welding parameters such as the tool rotation speed and the welding speed were investigated together with the different pin profiles; the results show that the new “bolt-head” pin profile leads to better mechanical properties of welded specimens. The pin profiles used in this work were the straight square (SS), straight hexagon (SH), taper cylindrical (TC), and the straight hexagon “bolt-head” (SHBH). It was found that the last pin profile improves the material flow behavior and the uniform distribution of plastic deformation and reduces the formation of macroscopic defects on the welded zone. Mechanical tensile tests on welded specimens were performed to determine the tensile strength: the specimens welded with the SHBH pin profile have shown the highest mechanical properties. An approach is presented for material flow on this aluminum alloy using the SHBH pin profile, which is related to the improvement on the resulting mechanical properties.

Sign in / Sign up

Export Citation Format

Share Document