Effect of interfacial microstructure on lap shear strength of friction stir spot weld of aluminium alloy to magnesium alloy

2010 ◽  
Vol 15 (4) ◽  
pp. 319-324 ◽  
Author(s):  
Y. S. Sato ◽  
A. Shiota ◽  
H. Kokawa ◽  
K. Okamoto ◽  
Q. Yang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Magnesium Alloy ◽  
Aluminium Alloy ◽  
Interfacial Microstructure ◽  
Spot Weld ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear

Evaluating weld properties of conventional and swept friction stir spot welded 6061-T6 aluminium alloy

2019 ◽  
Vol 9 (8) ◽  
pp. 851-860 ◽  
Author(s):  
S. Suresh ◽  
K. Venkatesan ◽  
Elango Natarajan ◽  
S. Rajesh ◽  
Wei Hong Lim
Keyword(s):  
Shear Strength ◽  
Aluminium Alloy ◽  
Rotational Speed ◽  
Shear Fracture ◽  
Shear Loading ◽  
Tool Rotational Speed ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear ◽  
Weld Properties

6061-T6 aluminium alloy is a tempered grade aluminium material that is extensively used, particularly in space and automotive applications. The conventional and swept friction stir spot welding (FSSW) joints are prepared by varying tool rotational speed at four different levels. The mechanical properties, microstructure and mode of failure in both types of FSSW are evaluated and reported. The high plastic deformation and fine grains influenced the increase in hardness of the weld joints based on the Hall-Petch equation. The highest lap shear strength of 5.31 kN is observed in swept FSSW sample prepared at 1400 rpm. Interestingly, 1600 rpm decreased the lap shear strength due to insufficient friction between base metal and tool in the higher tool rotational speed. The minimum microhardness is noticed in heat-affected zone (HAZ) of both cases. Conventional FSSW samples showed shear fracture, nugget pullout fracture and circumferential fracture under lap shear loading, whereas swept FSSW showed only the circumferential fracture.

scholarly journals Parameters optimization for friction spot welding of AZ31 magnesium alloy by Taguchi method

2012 ◽  
Vol 17 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Leonardo Contri Campanelli ◽  
Uceu Fuad Hasan Suhuddin ◽  
Jorge Fernandez dos Santos ◽  
Nelson Guedes de Alcântara
Keyword(s):  
Shear Strength ◽  
Magnesium Alloy ◽  
Rotational Speed ◽  
Spot Welding ◽  
Dwell Time ◽  
Az31 Magnesium Alloy ◽  
Lap Shear Strength ◽  
Plunge Depth ◽  
Friction Spot Welding ◽  
Lap Shear

Friction spot welding (FSpW) is a solid state welding process suitable for producing spot-like joints, especially in lightweight materials, which are particularly interesting due to the weight saving potential. The plunging of an especially designed non-consumable and rotating tool creates a connection between overlapped sheets through frictional heat and plastic deformation. Minimum material loss is observed, and therefore a fully consolidated joint with flat surface (no keyhole) is obtained. In the current study, the effect of FSpW parameters, such as rotational speed, plunge depth and dwell time, on lap shear strength of AZ31 magnesium alloy joints was investigated. The optimization of input process parameters was carried out through Taguchi approach of DOE. Analysis of variance was applied to determine the individual importance of each parameter. Main effect plots were used to indicate the best levels for maximizing lap shear strength. The results show that tool plunge depth has the higher effect on the weld strength, followed by rotational speed and dwell time.

Lap shear strength and fatigue life of friction stir spot welded AZ31 magnesium and 5754 aluminum alloys

2012 ◽  
Vol 556 ◽  
pp. 500-509 ◽  
Author(s):  
S.H. Chowdhury ◽  
D.L. Chen ◽  
S.D. Bhole ◽  
X. Cao ◽  
P. Wanjara
Keyword(s):  
Shear Strength ◽  
Fatigue Life ◽  
Aluminum Alloys ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear ◽  
Spot Welded

Surface Treatment to Promote Joining of Glass Fiber Reinforced Plastic and AZ31 Magnesium Alloy for Fiber Metal Laminates via Hot Metal Pressing

2021 ◽  
Vol 883 ◽  
pp. 111-118
Author(s):  
Lucia Lizzul ◽  
Marco Sorgato ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Shear Strength ◽  
Magnesium Alloy ◽  
Glass Fiber ◽  
Metal Composite ◽  
Fiber Reinforced ◽  
Fiber Metal Laminates ◽  
Lap Shear Strength ◽  
Lap Shear ◽  
Glass Fiber Reinforced ◽  
Fiber Metal

When fabricating fiber metal laminates, the joining between the metal sheet and the composite is affected by the chemical and mechanical properties at the interface. To this end, this study investigated the influence of different induced-surface characteristics of AZ31B magnesium alloy sheets when joint with glass fiber reinforced polyamide 6. The treatments, carried out to modify the AZ31B surfaces, were annealing, sandblasting, and their combination. The mechanical and chemical interlocking at the metal-composite interface was assessed in terms of macroscopic and microscopic defects as well as lap shear strength. The obtained results indicated that the joint effectiveness was mainly affected by the annealing treatment, which induced both a chemical and morphological modification of the surface. The formed oxide layer at the interface, combined with surface topography modification, were capable to increase the lap shear strength up to 87%.

scholarly journals Simultaneous Effect of Tool Rotation and Dwell Time on Quality of Dissimilar AA5052-Copper Joints Fabricated by Friction Stir Spot Welding

2021 ◽  
Author(s):  
Aydin Jadidi ◽  
Reza Bagherian Azhiri ◽  
Amir Baghdadchi ◽  
Abolfazl Salmani Bideskan
Keyword(s):  
Shear Strength ◽  
Spot Welding ◽  
Dwell Time ◽  
Quality Characteristics ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear ◽  
Rotary Speed

Abstract In the present study, lap joints of dissimilar 5052 aluminum alloy and pure copper were fabricated by friction stir spot welding process. The work was aimed to find effect of parameters such as tool rotary speed (1000, 1400 and 2000 RPM) and dwell time (5, 10 and 15s) on microstructure and strength properties of lap joints. Also, statistical models of the quality characteristics were developed to understand which interaction has dominant effect on quality characteristics. Research findings showed that to obtain sound joints with high lap shear strength tool rotary speed of 2000 rpm and dwell time of 5s should be selected. It provides sufficient heat input and prevents the excessive material softening. On the other hand, to achieve maximum hardness, 2000 rpm tool rotary speed should be chosen to provide enough heat for formation of intermetallic compound and 10s dwell time should be used prevent enough time for microstructure refining. Moreover, from the statistical analyses, it was found that dwell time and tool speed are the significant factor for lap shear strength and hardness, respectively. In order to attain simultaneous maximum strength and hardness, tool speed of 2000 rpm and dwell time of 8 s should be used. In such condition lap shear strength of 1755 N and hardness of 77 V are achieved with desirability of 85%.

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