Effects of Process Parameters on Tensile Shear Strength of Friction Stir Spot Welded Aluminium Alloy (EN AW 5005)

2014 ◽  
Vol 59 (1) ◽  
pp. 221-224 ◽  
Author(s):  
M.K. Kulekci
Keyword(s):  
Shear Strength ◽  
Aluminium Alloy ◽  
Process Parameters ◽  
Dwell Time ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Friction Stir ◽  
Tool Pin ◽  
Tool Rotation ◽  
Spot Welded

Abstract Aluminium and its alloys have been used in automotive technology since the first model of the car. The need for aluminium material is getting increased for weight reduction, improved fuel economy and vehicle performance. The amount of the aluminium used in a car is mainly related with joining processes of aluminium alloy. This can be achieved by developing the welding techniques for aluminium alloys. The purpose of this study was to determine the effects of friction stir spot welding parameters on tensile shear strength of friction stir spot welded lap joint EN AW 5005 Aluminium alloy. The variable parameters were tool rotation (rpm), dwell time (s) and the tool pin height (mm). Tensile shear test results indicated that the weld performance was significantly affected by the tool rotation, dwell time and the tool pin height. The results of the study indicates that there are optimum process parameters which give the highest tensile shear strength.

Mechanical and Microstructural Properties of Dissimilar Friction Spot Welded Aluminum Alloy

2008 ◽  
Vol 580-582 ◽  
pp. 389-392
Author(s):  
Chang Keun Chun ◽  
Heung Ju Kim ◽  
Hyeon Jin Cho ◽  
Teuk Ki Kim ◽  
Woong Seong Chang
Keyword(s):  
Shear Strength ◽  
Aluminum Alloy ◽  
Dwell Time ◽  
Microstructural Properties ◽  
Tensile Shear Strength ◽  
Plate Material ◽  
Tensile Shear ◽  
Rotating Speed ◽  
Mechanical And Microstructural Properties ◽  
Spot Welded

Dissimilar friction spot lap joining of Al5052 and Al6022 sheet has been investigated using a combination of joining parameters, thickness and upper plate material. The joining parameters such as tool rotating speed, plunging depth and joining time have been considered. The maximum tensile shear strength has been observed at tool rotating speed of 1000rpm, dwell time of 2.5sec, plunging depth of 1.8 mm and Al 6022 as upper plate. The maximum tensile shear fractured load of the joint was about 80% of that of the similar Al 5052 alloys joint.

scholarly journals Analysis of tensile-shear strength of single and multi-friction stir spot welding joints under fixed welding process conditions

2020 ◽  
Vol 234 (24) ◽  
pp. 4893-4904
Author(s):  
Morteza Asadollahi ◽  
Neda Jabbari ◽  
Soheil Nakhodchi ◽  
Hossein Salimi ◽  
Hamed Haddad Khodaparast
Keyword(s):  
Shear Strength ◽  
Failure Mechanism ◽  
Spot Welding ◽  
Welding Process ◽  
Friction Stir Spot Welding ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Friction Stir ◽  
Welding Joints ◽  
Spot Welded

The tensile-shear strength of AA 5052 single and multi-friction stir spot welding joints were analyzed using experimental, numerical, and analytical approaches. Benchmark specimens were designed and manufactured in a similar manner with respect to industrial practice. Under the fixed welding process condition, the failure mechanism of friction stir spot welded specimens under tensile-shear loading was first determined by using macro- and micro-structural analysis. It is shown that increasing the tool shoulder diameter and the number of friction stir spot weldings may nonproportionally increase the strength of the joints. In the linearly arranged multi-friction stir spot welding joints, the strength of these joints was discussed using analytical approach. It is demonstrated that in certain cases, increasing the nugget diameter is preferred than increasing the number of nuggets. This is only applicable to a certain friction stir spot welding failure mechanism. A finite element model prediction tool was developed to predict the tensile-shear strength of friction stir spot welded joints using the material properties obtained from the measurement of experimental hardness.

scholarly journals Mechanical, electrochemical and structural characteristics of friction stir spot welds of aluminium alloy 6063

2020 ◽  
Vol 7 ◽  
pp. 25
Author(s):  
Delphine Mulaba-Kapinga ◽  
Kasongo Didier Nyembwe ◽  
Omolayo Michael Ikumapayi ◽  
Esther Titilayo Akinlabi
Keyword(s):  
Shear Strength ◽  
Rotational Speed ◽  
Dwell Time ◽  
Structural Characteristics ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Spot Welds ◽  
Corrosion Properties ◽  
Influence Of Process Parameters ◽  
Friction Stir

The work presents the friction stir spot welding (FSSW) of AA6063. The evolving properties due to the influence of process parameters and the efficacy of metallurgical, structural, mechanical, and electrochemical integrities were studied. FSSW was conducted on 2mm thickness by varying the rotational speed of 600, 900 and 1200 rpm and the dwell time at 10 and 15 s. The evolving microstructures, hardness, corrosion, shear tensile behaviours and X-ray diffraction characteristics of the as-received material and the welds were studied. As the tool rotational speed increased at a constant dwell time, a smooth and debris free spot welds were noticed, more HAZ formations became visible and more intermetallic phases of aluminium magnesium (AlMg) were formed although with very low peaks during structural assessment. Furthermore, the hardness values increased up to a certain limit and then decreased, the corrosion properties in artificial seawater (ASW) shown significant improvement on the spot-welded samples and the tensile shear strength was also improved. It would be recommended that spot welds at 900 rpm and 10 and/or 15 s for applications where the hardness is significant imperative and at 1200 rpm with 10 and/or 15 s dwell time where higher tensile shear strength is required and lastly, 1200 rpm at 15 s where corrosion application is significant.

Effect of Tool Geometry on Strength of Friction Stir Spot Welded Aluminum Alloys

2012 ◽  
Vol 579 ◽  
pp. 109-117 ◽  
Author(s):  
Yuan Ching Lin ◽  
Ju Jen Liu ◽  
Ben Yuan Lin
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Spot Welding ◽  
Tool Geometry ◽  
Al Alloy ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Friction Stir ◽  
Hook Geometry ◽  
Spot Welded

The effects of tool geometry on the microstructure and tensile shear strength of friction stir spot-welded A6061-T6 Al alloy sheets were investigated in the present study. Friction stir spot welding (FSSW) was carried out at a tool speed of 2500 rpm, plunging rate of 1 mm/s, and dwell time of 3 s. Four types of tools with the same shoulder shape and size, but different pin profiles (threaded cylindrical, smooth cylindrical, threaded triangular, and smooth triangular) were used to carry out FSSW. The mechanical and metallurgical properties of the FSSW specimens were characterized to evaluate the performance of the different tools. Experimental results show that the pin profile significantly alters the hook geometry, which in turn affects the tensile shear strength of the friction stir spot welds. The welds made using the conventional thread cylindrical tool have the largest elongation and yield the highest tensile strength (4.78 kN). The welds made using the smooth cylindrical tool have the lowest tensile strength. The welds made using the threaded triangular and smooth triangular tools both have a tensile-shear load of about 4 KN; however, the welds made using the threaded triangular tool have a better elongation than those made using the smooth triangular tool.

scholarly journals Effect of Microstructure and Texture on Mechanical Properties of Resistance Spot Welded High Strength Steel 22MnB5 and 5A06 Aluminium Alloy

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 685
Author(s):  
Xiaoqing Jiang ◽  
Shujun Chen ◽  
Jinlong Gong ◽  
Zhenyang Lu
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Aluminium Alloy ◽  
High Strength Steel ◽  
High Strength ◽  
Welding Parameters ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Effect Of Microstructure

The present study aims to investigate the effect of microstructure and texture on mechanical properties of resistance spot welding of high strength steel 22MnB5 and 5A06 aluminium alloy as a function of welding parameters. The pseudo-nugget zones (NZs) at the steel side have undergone full recrystallisation with a fine-grained ferrite structure containing a small amount of retained austenite and a high hardness of approximately 500 HV, which is a 35% increase in hardness compared to the base material (BM) with fine lath martensitic structure. The NZs at the Al side contain both a recrystallisation texture and shear texture. Higher tensile shear strength with increasing weld time could be linked to the random texture at the Al side. The highest tensile shear strength was achieved at an intermetallic layer thickness of 4 mm.

Effects of process time and thread on tensile shear strength of Al alloy lap joint produced by friction stir spot welding

2010 ◽  
Vol 24 (3) ◽  
pp. 169-175 ◽  
Author(s):  
Mitsuo Fujimoto ◽  
Daisuke Watanabe ◽  
Natsumi Abe ◽  
Sato S. Yutaka ◽  
Hiroyuki Kokawa
Keyword(s):  
Shear Strength ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Process Time ◽  
Al Alloy ◽  
Tensile Shear Strength ◽  
Lap Joint ◽  
Tensile Shear ◽  
Friction Stir

Effect of Initial Gap on Tensile Strength of Resistance Spot Welded Joints

2010 ◽  
Vol 154-155 ◽  
pp. 325-328
Author(s):  
Hai Jun Yang ◽  
Yan Song Zhang ◽  
Jie Shen ◽  
Xin Min Lai
Keyword(s):  
Tensile Strength ◽  
Shear Strength ◽  
Welded Joints ◽  
Fe Model ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
Resistance Spot ◽  
Nugget Formation ◽  
Spot Welded

It has been proved that the initial gap has obvious influence on nugget formation, but little works focused on the effect of initial gap on the tensile strength of resistance spot welded (RSW) joints. In this paper, a 3D FE model was built for solving this question. The results show that, even though there are some fluctuations of weld diameter and tensile strength of RSW joints with initial gap, the tensile strength and weld diameter of welded joints with initial gap are still larger than that of welded joints without gap, which confirm that the influence of initial gap on tensile shear strength is little significant. The computation results agree well with experiment.

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