scholarly journals Numerical Analyses On Friction Stir Based Techniques to Join Lightweight Alloys to Thermoplastic Matrix Parts

2021 ◽  
Author(s):  
F. Gagliardi ◽  
G. Serratore ◽  
E. Cueto ◽  
L. Filice ◽  
F. Chinesta
Keyword(s):  
Numerical Analyses ◽  
Friction Stir ◽  
Thermoplastic Matrix ◽  
Lightweight Alloys

Similar and Dissimilar FSWed Joints in Lightweight Alloys: Heating Distribution Assessment and IR Thermography Monitoring for On-Line Quality Control

2013 ◽  
Vol 554-557 ◽  
pp. 1055-1064 ◽  
Author(s):  
Archimede Forcellese ◽  
Milena Martarelli ◽  
Giuseppe Pandarese ◽  
Michela Simoncini
Keyword(s):  
Quality Control ◽  
Welded Joints ◽  
Ir Thermography ◽  
Friction Stir ◽  
Welding Line ◽  
Lightweight Alloys ◽  
On Line ◽  
Bottom Side ◽  
Non Destructive ◽  
Fsw Experiments

The heating distribution assessment on similar and dissimilar friction stir welded joints in AA6082 and AA5754 aluminium alloy sheets was investigated. The FSW experiments were carried out using constant rotational and welding speeds of 1500 rpm and 60 mm/min, respectively. Temperature was locally measured by means of K-type thermocouples inserted into thin grooves located on the bottom side of the sheets, in fixed positions, very close to the welding line. It was observed that the mechanical properties of joints are related to the heat distribution. In order to obtain a completely non intrusive temperature monitoring, that was able to follow the process dynamic, a non-contact measurement system based on infrared thermography was also developed. Such system, used for the experimental evaluation of temperature on the upper surface of the joints, is also able to detect the presence of flow defects with a non-destructive method, demonstrating its effectiveness as a diagnostic instrument for the on-line quality control of welded joints.

Welding Technology of Lightweight Alloys

2008 ◽  
Vol 580-582 ◽  
pp. 75-80 ◽  
Author(s):  
Sang Cheol Kil ◽  
Hwan Tae Kim
Keyword(s):  
High Speed ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Friction Stir ◽  
Welding Technology ◽  
Vehicle Structure ◽  
Laser Hybrid Welding ◽  
Lightweight Alloys ◽  
Production Technologies ◽  
Laser Hybrid

The trend of the welding technology of lightweight alloys such as aluminum alloy and magnesium alloy has been studied. The lightweight alloys in the automobile, high-speed light aircraft and modern aerospace industry can reduce vehicle weight, while stringently demanding the high quality and efficienct welding techniques, to produce the best weldments. Among the production technologies, welding plays an important role in the fabrication of lightweight vehicle structure. This has led to an increasing attention towards the use of modern welding technology such as laser beam welding process, ultrasonic welding process, friction stir welding technology and laser hybrid welding technology, etc. This paper covers the recent technical trends of welding technologies of lightweight alloys including the COMPENDEX DB analysis of welding metallurgy, welding process, and welding fabrications.

Friction Stir Welding Lap Joint Resistance Optimization Through Gradient Techniques

2007 ◽  
Vol 129 (6) ◽  
pp. 985-990 ◽  
Author(s):  
L. Fratini ◽  
V. Corona
Keyword(s):  
Friction Stir Welding ◽  
Optimization Procedure ◽  
Experimental Tests ◽  
Industrial Applications ◽  
Fusion Welding ◽  
Lap Joint ◽  
Rotating Speed ◽  
Friction Stir ◽  
Gradient Technique ◽  
Lightweight Alloys

In recent years, scientific interest on friction stir welding (FSW) has grown more and more since such a joining technique allows one to weld lightweight alloys that are rather difficult to weld or even “unweldable” with the classic fusion welding operations. Furthermore, few industrial applications of the process are already known in different manufacturing fields. In this paper, the optimization problem of a FSW lap joint for automotive applications is investigated, taking into account process parameters such as the tool rotating speed and the tool feed rate; a numerical gradient technique is applied for the optimization procedure reducing the number of experimental tests to be developed.

scholarly journals Mechanical Properites Of Fiber Laser Welded And Friction Stir (Spot) Welded Lightweight Alloys

2021 ◽  
Author(s):  
Mohammed S.H. Chowdhury
Keyword(s):  
Fiber Laser ◽  
Welding Speed ◽  
Interfacial Layer ◽  
Strain Hardening Exponent ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Weld Joints ◽  
Lap Shear ◽  
Lightweight Alloys ◽  
Spot Welded

Mechanical properties of fiber laser welded (FLWed), friction stir welded (FSWed), and friction stir spot welded (FSS weld) AZ31B-H24 Mg and Al 5754 alloys were studied. After welding, grains at the weld centre became recrystallized. β-Mg17A112 particles appeared in the fusion zone of the joints during laser welding, while a characteristic interfacial layer consisting of A112Mg17 and Al3Mg2 was observed in the A1/Mg dissimilar FSS weld. In FLWed joints, a joint efficiency of ~91% with superior yield strength, ultimate tensile strength and fatigue strength was achieved at a higher welding speed. In FSWed joints, a higher welding speed of 20 mm/s and lower rotational rate of 1000 rpm led to higher YS, but lower ductility, strain-hardening exponent and hardening capacity. In FSS weld joints, Mg/Mg, A1/A1 FSS welds and Al/Mg adhesive, Mg/A1 adhesive FSS welds had a significantly higher lap shear strength and fatigue life than the A1/Mg FSS weld.

scholarly journals Mechanical Properites Of Fiber Laser Welded And Friction Stir (Spot) Welded Lightweight Alloys

2021 ◽  
Author(s):  
Mohammed S.H. Chowdhury
Keyword(s):  
Fiber Laser ◽  
Welding Speed ◽  
Interfacial Layer ◽  
Strain Hardening Exponent ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Weld Joints ◽  
Lap Shear ◽  
Lightweight Alloys ◽  
Spot Welded

Mechanical properties of fiber laser welded (FLWed), friction stir welded (FSWed), and friction stir spot welded (FSS weld) AZ31B-H24 Mg and Al 5754 alloys were studied. After welding, grains at the weld centre became recrystallized. β-Mg17A112 particles appeared in the fusion zone of the joints during laser welding, while a characteristic interfacial layer consisting of A112Mg17 and Al3Mg2 was observed in the A1/Mg dissimilar FSS weld. In FLWed joints, a joint efficiency of ~91% with superior yield strength, ultimate tensile strength and fatigue strength was achieved at a higher welding speed. In FSWed joints, a higher welding speed of 20 mm/s and lower rotational rate of 1000 rpm led to higher YS, but lower ductility, strain-hardening exponent and hardening capacity. In FSS weld joints, Mg/Mg, A1/A1 FSS welds and Al/Mg adhesive, Mg/A1 adhesive FSS welds had a significantly higher lap shear strength and fatigue life than the A1/Mg FSS weld.

Effects of bottom plate in friction stir welding of AA6061-T6

2020 ◽  
Vol 118 (1) ◽  
pp. 108
Author(s):  
M.A. Vinayagamoorthi ◽  
M. Prince ◽  
S. Balasubramanian
Keyword(s):  
Mechanical Properties ◽  
Axial Load ◽  
Weld Zone ◽  
Welding Process ◽  
Bottom Plate ◽  
Welding Parameters ◽  
Nugget Zone ◽  
Friction Stir ◽  
Weld Joints ◽  
Fine Grain

The effects of 40 mm width bottom plates on the microstructural modifications and the mechanical properties of a 6 mm thick FSW AA6061-T6 joint have been investigated. The bottom plates are placed partially at the weld zone to absorb and dissipate heat during the welding process. An axial load of 5 to 7 kN, a rotational speed of 500 rpm, and a welding speed of 50 mm/min are employed as welding parameters. The size of the nugget zone (NZ) and heat-affected zone (HAZ) in the weld joints obtained from AISI 1040 steel bottom plate is more significant than that of weld joints obtained using copper bottom plate due to lower thermal conductivity of steel. Also, the weld joints obtained using copper bottom plate have fine grain microstructure due to the dynamic recrystallization. The friction stir welded joints obtained with copper bottom plate have exhibited higher ductility of 8.9% and higher tensile strength of 172 MPa as compared to the joints obtained using a steel bottom plate.

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