Lap shear strength and fatigue behavior of friction stir spot welded dissimilar magnesium-to-aluminum joints with adhesive

2013 ◽  
Vol 562 ◽  
pp. 53-60 ◽  
Author(s):  
S.H. Chowdhury ◽  
D.L. Chen ◽  
S.D. Bhole ◽  
X. Cao ◽  
P. Wanjara
Keyword(s):  
Shear Strength ◽  
Fatigue Behavior ◽  
Lap Shear Strength ◽  
Friction Stir ◽  
Lap Shear ◽  
Spot Welded

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

Corrosion Characterization of Resistance Spot Welded Aluminum and Steel Couple

2019 ◽  
Author(s):  
Surender Maddela ◽  
Blair E. Carlson
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Galvanic Corrosion ◽  
Corrosion Testing ◽  
Lap Shear Strength ◽  
Resistance Spot ◽  
Lap Shear ◽  
Cyclic Corrosion ◽  
Steel Substrates ◽  
Spot Welded

Abstract The corrosion resistance of resistance spot welded (RSW) Al-steel couples of varying combinations of 6016-T4 aluminum alloys and steel substrates, including with and without adhesive at the faying interface has been successfully evaluated, and compared to corresponding self-pierce riveted (SPR) couples. The corrosion resistance of resistance spot welded Al-steel couples has performed well in cyclic corrosion testing (GMW 17026) and the results are comparable to or better than that of self-pierce riveted couples. SPR couples are more susceptible to galvanic corrosion than resistance spot-welded couples based upon experimentally measured electrochemical potentials from actual joints. The presence of adhesive acts significantly to reduce galvanic corrosion between aluminum alloy and steel substrates, and moreover tensile lap-shear strength significantly increased with structural adhesive for both RSW and SPR joining systems. However, despite the presence of adhesive the lap-shear strength was reduced by more than 50% after cyclic corrosion testing to strength levels comparable to the lap-shear strength of couples having no adhesive and tested in ambient conditions.

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.

Corrosion Characterization of Resistance Spot-Welded Aluminum and Steel Couple

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Surender Maddela ◽  
Blair E. Carlson
Keyword(s):  
Corrosion Resistance ◽  
Shear Strength ◽  
Galvanic Corrosion ◽  
Corrosion Testing ◽  
Ambient Conditions ◽  
Lap Shear Strength ◽  
Resistance Spot ◽  
Lap Shear ◽  
Cyclic Corrosion ◽  
Spot Welded

Abstract The corrosion resistance of resistance spot-welded (RSW) Al–steel couples of varying combinations of 6016-T4 aluminum alloys and steel substrates, including with and without adhesive at the faying interface, has been successfully evaluated and compared with corresponding self-pierce riveted (SPR) couples. The corrosion resistance of resistance spot-welded Al–steel couples has performed well in cyclic corrosion testing (GMW 17026), and the results are comparable to or better than that of self-pierce riveted couples. SPR couples are more susceptible to galvanic corrosion than resistance spot-welded couples based upon experimentally measured electrochemical potentials from actual joints. The presence of adhesive acts significantly to reduce galvanic corrosion between aluminum alloy and stleel substrates, and moreover, tensile lap-shear strength significantly increased with structural adhesive for both RSW and SPR joining systems. However, despite the presence of adhesive, the lap-shear strength was reduced by more than 50% after cyclic corrosion testing to strength levels comparable to the lap-shear strength of couples having no adhesive and tested in ambient conditions.

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.

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