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.

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 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.

Effect of Electric Weld Current on Spatter Reduction in Spot Welding Process

2004 ◽  
Vol 261-263 ◽  
pp. 1623-1628 ◽  
Author(s):  
Do Won Seo ◽  
Yang Bae Jeon ◽  
Jae Kyoo Lim
Keyword(s):  
Shear Strength ◽  
Spot Welding ◽  
Welding Process ◽  
Weld Quality ◽  
Tensile Shear Strength ◽  
Sheet Metals ◽  
Tensile Shear ◽  
Weld Current ◽  
Electric Weld ◽  
Welding Processes

Spot welding is a process that sheet metals are joined in one or more spot by heating at the faying interface. In this process, the spatter is dispersed from melted area. It has been reported that spatter generation has adverse effects on weld quality. However, no systematic study has been carried out to find out its effect on weld quality in resistance spot welding processes. In this study, specially designed specimens are used to perform experimental investigation of spatter generation and its effect. Major finding of this study show trends in tensile-shear strength for various amounts of spatter generated during spot welding process. Thus, optimum welding conditions are proposed in view of spatter generation and tensile-shear strength.

Effect of Heat Treatments on 302 Austenitic Stainless Steel Spot Weld

2018 ◽  
Vol 29 ◽  
pp. 19-25
Author(s):  
A.M. Al-Mukhtar ◽  
Shaymaa Abdul Khader Al-Jumaili ◽  
Ali Hussein Fahem Al-Jlehawy
Keyword(s):  
Stainless Steel ◽  
Shear Strength ◽  
Austenitic Stainless Steel ◽  
Spot Welding ◽  
Welding Process ◽  
Annealing Treatment ◽  
Treatment Temperature ◽  
Tensile Shear Strength ◽  
Tensile Shear ◽  
The Reformation

The shear strength of 302 austenitic stainless steel spot welds has been studied. Thewelding current in resistance spot welding process (RSW) plays a significant role. However,this item's effect is well known and extensively studied in the previous literature. This work aims toshow the heat treatment’s effect on different joints that welded at various current. The experimentalresults show that the tensile shear strength is increased with increasing the current. Annealingtreatment improves the tensile shear strength due to the reformation of the grain size and removesthe residual stresses. Grain refinement is an effective technique for improving the strength.Therefore, the tensile shear strength is increased by annealing treatment temperature up to 750 °C.However, at 850°C, the tensile shear strength is dropped down.

Comparison of Properties on Withdrawing and Refill Friction Stir Spot Welding Joints

2014 ◽  
Vol 633-634 ◽  
pp. 601-606
Author(s):  
Xi Jing Wang ◽  
Xiao Long Wang ◽  
Zhong Ke Zhang ◽  
Wen Xia Jing
Keyword(s):  
Spot Welding ◽  
Fracture Morphology ◽  
Friction Stir Spot Welding ◽  
Shear Load ◽  
Tensile Shear ◽  
Optimal Process ◽  
Cross Sectional ◽  
Friction Stir ◽  
Welding Joints ◽  
The Cross

The 2 mm sheet of 6082 - T6 aluminum alloy was carried to develop refill friction stir welding and withdrawing friction stir spot welding,the forming of solder joints , the cross-sectional microstructure and fracture morphology of welding joints were observed and analyzed, the cross-sectional microhardness of welding joints were tested. Tensile shear load and fracture mode were contrasted simultaneously. The results showed that smooth surface and free of macroscopic defects of welding joints could be obtained in both welding type. Tensile shear load of WFSSW was up to 10.28kN under the optimal process parameters greater than RFSSW’s 8.62kN.

scholarly journals Effect of Zn Interlayer Particles on Mechanical Properties and Microstructure of Friction Stir Spot Welding Aluminum Alloy

2018 ◽  
Vol 218 ◽  
pp. 04005
Author(s):  
Lingga Arti Saputra ◽  
Nurul Muhayat ◽  
Triyono
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Dwell Time ◽  
Aluminum Matrix ◽  
Friction Stir Spot Welding ◽  
Motor Vehicles ◽  
Shear Load ◽  
Tensile Shear ◽  
Friction Stir ◽  
Spot Welded

Global warming can be reduced by controlling emissions in motor vehicles. Lightweight aluminum materials can lower the engine work so as to reduce fuel consumption.The effect of dwell time on mechanical properties and microstructure friction stir spot welded AA1100 with particle interlayer Zn were investigated. The result shows that the particle interlayer Zn affect to the mechanical properties. The tensile shear load friction stir spot welded AA1100 with particle interlayer Zn is higher than hart of without particle interlayer Zn. In line with tensile shear load that the hardness of friction stir spot welded Al with particle interlayer Zn got the higher hardness than of without particle interlayer Zn. The addition of particle interlayer Zn reduce the hook defect and spread in the aluminum matrix as solid solution.

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