Generating Lap Joints Via Friction Stir Spot Welding on DP780 Steel

10.3791/58633 ◽  
2019 ◽  
Author(s):  
Tai-I Hsu ◽  
Meng-Hsiu Tsai
Keyword(s):  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Friction Stir ◽  
Dp780 Steel

Simulative Model for the Evaluation of Thermo-Mechanical Effects in Friction Stir Spot Welding (FSSW) of Aluminum Sheets

2014 ◽  
Vol 622-623 ◽  
pp. 557-566
Author(s):  
G. D’Urso ◽  
Claudio Giardini
Keyword(s):  
Process Parameters ◽  
Spot Welding ◽  
Welding Process ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Local Pressure ◽  
Friction Stir ◽  
Welding Forces ◽  
Set Up ◽  
Simulative Model

A study was performed to evaluate how the Friction Stir Spot Welding process parameters affect both the thermal distribution in the welding region and the welding forces. An experimental campaign was performed by means of a CNC machine tool and FSSW lap joints on AA6060-T6 aluminum alloy plates having a thickness of 2+2 mm were executed. Five thermocouples were inserted into the samples at a specific distance from the specimen center. A set of tests was carried out by varying the process parameters, namely rotational speed, axial feed rate, plunging depth and dwell time. Axial welding forces were also measured during the execution of the experiments by means of a piezoelectric load cell. The experimental data collected were used to set up and to validate a simulative model of the process. In particular, a 2D FEM model was set up using the commercial code Deform 2D. A 2-dimensional FEM code was preferred in order to guarantee a very simple and practical model able to achieve results in a very short time. Since it is not possible to simulate the rotation of the tool in a 2D configuration, a specific external routine for the calculation of the developed thermal energy due to the friction between tool and workpiece was set up and implemented into the code starting from the local pressure distribution along the contact area.

Towards Tool Path Numerical Simulation in Modified Friction Stir Spot Welding Processes

2009 ◽  
Vol 83-86 ◽  
pp. 1220-1227
Author(s):  
Gianluca Buffa ◽  
Livan Fratini
Keyword(s):  
Spot Welding ◽  
Tool Path ◽  
Base Material ◽  
Welding Process ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Hollomon Parameter ◽  
Friction Stir ◽  
Strain And Strain Rate ◽  
Welding Processes

Spot welding can be considered a very common joining technique in automotive and transportation industries as it permits to obtain effective lap-joints with short process times and what is more it is easily developed through robots and automated systems. Recently the Friction Stir Spot Welding (FSSW) process has been proposed as a natural evolution of the already known Friction Stir Welding (FSW) process, allowing to obtain sound spot joints that do not suffer from the insurgence of typical welding defects due to the fusion of the base material. In the paper, a modified Friction Stir Spot Welding (FSSW) process, with a spiral circular movement given to the tool after the sinking stage, is proposed. A continuum based numerical model for Friction Stir Spot Welding process is developed, that is 2D Lagrangian implicit, coupled, rigid-viscoplastic. This model is used to investigate the distribution of the main field variables, namely temperature, strain and strain rate, as well as the Zener-Hollomon parameter which, in turn, strongly affects the Continuous Dynamic Recrystallization (CDRX) process that takes place in the weld nugget. Numerical and experimental results are presented showing the effects of the process parameters on the joint performances and the mechanical effectiveness of the modified process.

scholarly journals Mechanical Properties of Dissimilar A356/SAPH440 Lap Joints by the Friction Stir Spot Welding and Self-Piercing Riveting

2018 ◽  
Vol 50 (1) ◽  
pp. 63-71 ◽  
Author(s):  
Han Sur Bang ◽  
W. R. Lee ◽  
S. M. Hong ◽  
S. Y. Lee ◽  
J. H. Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Friction Stir

Investigation of Friction Stir Spot Welding Optimal Parameter Combination for Galvanized Trip Steel

2016 ◽  
Author(s):  
R. M. Chandima Ratnayake ◽  
Magomed M. Suleymanov ◽  
Lars E. M. Skedsmo ◽  
Vegard Goa
Keyword(s):  
Trip Steel ◽  
Spot Welding ◽  
Optimal Parameter ◽  
Load Capacity ◽  
Additive Model ◽  
Tensile Load ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Friction Stir ◽  
Influence Parameter

Friction stir spot welding (FSSW) is performed on transformation-induced plasticity (TRIP) steel (HCT690T) sheets. The influence of parameters: rotational speed, dwell time plunge depth and plunge speed on a mechanical property of lap joints are investigated. An engineering robust design (ERD) approach has been utilized to design the experiment with L9 orthogonal array. In order to minimize the bias, each experiment has been repeated three times, resulting in 27 experiments. For each influence parameter, three levels have been identified (i.e. minimum, average and maximum) based on trial and error experimentation as well as utilizing published research data. The ultimate tensile load capacity (UTLC) of TRIP lap welded joints has been used to assess the joint performance and to calculate the signal-to-noise ratios. Based on the experimental results, optimal parameter levels have been investigated and theoretical joint strength under the optimal parameter settings has been calculated using the additive model proposed in the ERD. A verification experiment has been performed to validate the experimentally investigated optimal settings of FSSW.

scholarly journals Correction to: Mechanical Properties of Dissimilar A356/SAPH440 Lap Joints by the Friction Stir Spot Welding and Self-Piercing Riveting

2018 ◽  
Vol 50 (3) ◽  
pp. 515-515
Author(s):  
HeeSeon Bang ◽  
W. R. Lee ◽  
Seong Min Hong ◽  
S. Y. Lee ◽  
J. H. Song ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Friction Stir

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%.

Refill friction stir spot welding of 7075-T6 aluminium alloy single-lap joints with polymer sealant interlayer

2018 ◽  
Vol 201 ◽  
pp. 389-397 ◽  
Author(s):  
Andrzej Kubit ◽  
Dawid Wydrzynski ◽  
Tomasz Trzepiecinski
Keyword(s):  
Aluminium Alloy ◽  
Spot Welding ◽  
Friction Stir Spot Welding ◽  
Lap Joints ◽  
Friction Stir ◽  
Single Lap Joints ◽  
Polymer Sealant
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