Research of Heat Power in Friction Stir Spot Welding

2019 ◽  
Vol 806 ◽  
pp. 81-86
Author(s):  
V. Statsenko ◽  
A. Sukhorada
Keyword(s):  
Heat Input ◽  
Spot Welding ◽  
Rotation Speed ◽  
Friction Stir Spot Welding ◽  
Heat Losses ◽  
High Tech ◽  
Heat Power ◽  
Friction Stir ◽  
Experimental Scheme ◽  
Experimental Tube

Nowadays the most perspective, high-tech and productive process is friction stir spot welding. The most important part of this technology is to determine the temperature of the material in the stir zone. This parameter is easily counted by the amount of the heat input, put in the welding zone. We made experimental researches about the relation of the heat power, therotation speed and the diameter of the working tool. For that purpose an experimental scheme was chosen, which models a welding material (aluminum alloy AMg5) as an experimental tube 20 mm in diameter. The tool (shear steel P6M5) is modeled as a working plate. Measurements of the frictional moments depending on the rotation speed of the experimental working tube during the constant temperature are made on the prepared stand. By the experimental data the specific heat input and the heat power were counted on every concentric ring, 2 mm in width, in the end of the working tool, 20 mm in diameter. Also, the sum of the heat power for the whole tool during various rotation speed terms was counted too. On the stand throughout the experiment were determined all the thermal conductivity heat losses along the rod, which the experimental tube was pinned on, all the working plate heat losses through the gasket towards the working desk and the convection from the surface of the rotating experimental tube to the environment. According the data, any of these losses is from 3 to 10 percent. This is shown in the heat input counting.

Research of Heat Input in Friction Stir Welding

2019 ◽  
Vol 945 ◽  
pp. 634-638
Author(s):  
V. Statsenko ◽  
A. Sukhorada ◽  
M. Bernvskaya
Keyword(s):  
Friction Stir Welding ◽  
Heat Input ◽  
Rotation Speed ◽  
Heat Losses ◽  
High Tech ◽  
Heat Power ◽  
Friction Stir ◽  
Experimental Scheme ◽  
Experimental Tube ◽  
Productive Process

Nowadays the most perspective, high-tech and productive process is friction stir welding. The most important part of this technology is to determine the temperature of the material in the stir zone. This parameter is easily counted by the amount of the heat input, put in the welding zone. We made experimental researches about the relation of the heat input, therotation speed and thediameter of the working tool. For that purpose an experimental scheme was chosen, which models a welding material (aluminum alloy AMg5) as an experimental tube 20 mm in diameter. The tool (shear steel P6M5) is modeled as a working plate. Measurements of the frictional moments depending on the rotation speed of the experimental working tube during the constant temperature are made on the prepared stand. By the experimental data the specific heat input and the heat power were counted on every concentric ring, 2 mm in width, in the end of the working tool, 20 mm in diameter. Also, the sum of the heat power for the whole tool during various rotation speed terms was counted too. On the stand throughout the experiment were determined all the thermal conductivity heat losses along the rod, which the experimental tube was pinned on, all the working plate heat losses through the gasket towards the working desk and the convection from the surface of the rotating experimental tube to the environment. According the data, any of these losses is from 3 to 10 percent. This is shown in the heat input counting.

Methodology for Calculating Heat Loss in the Study of Friction Stir Welding

2021 ◽  
Vol 887 ◽  
pp. 575-580
Author(s):  
V. Statsenko ◽  
A. Sukhorada ◽  
N. Mikhailova
Keyword(s):  
Friction Stir Welding ◽  
Tool Steel ◽  
Heat Input ◽  
Heat Liberation ◽  
High Tech ◽  
Steel R6m5 ◽  
Heat Power ◽  
Friction Stir ◽  
Experimental Tube ◽  
Productive Process

Currently, the most promising high-tech and productive process is friction stir welding. An important element of this technology is the determination of the material temperature in the stir zone, which can be determined by calculation based on the amount of heat input introduced into the welding zone. To determine this value, experimental of the dependence of heat input on the tool rotation speed and welding speed were carried out. For this, a scheme of experiments has been selected in which the material to be welded (aluminum alloy AMg5) is modeled as an experimental tube with a diameter of 20 mm, and the tool (made of tool steel R6M5) is modeled as a working plate. On the designed and manufactured stand, studies of the dependence of the heat-liberation value for the speeds of rotation of the experimental tube 42-105 rad/s were carried out. In this case, due to the pressing force of the experimental tube and the working plate, a constant temperature of the place of friction was maintained. The obtained experimental data were used to calculate the heat-liberation value and heat power on each concentric ring 2 mm wide at the end of the working tool with a diameter of 20 mm, as well as the total heat power for different speeds of rotation and welding.When carrying out experiments on the bench, heat losses were determined by thermal conductivity along the rod on which the experimental tube is fixed, as well as from the working plate made of tool steel through the gasket onto the working table and by convection from the surface of the rotating experimental tube into the environment. The calculation results showed that each of these losses does not exceed 3-10%. These losses are taken into account in the heat supply calculations.

Study of friction stir spot welding for thermotolerant engineering thermoplastic polyimide joints

2021 ◽  
pp. 095440542199561
Author(s):  
Jicheng Gao ◽  
Jiachen Dong ◽  
Sunyi Zhang ◽  
Liang Yu ◽  
Huiming Jin ◽  
...  
Keyword(s):  
Shear Strength ◽  
Spot Welding ◽  
Dwell Time ◽  
Rotation Speed ◽  
Mixing Time ◽  
Friction Stir Spot Welding ◽  
Scanning Calorimetry ◽  
Friction Stir ◽  
Base Materials ◽  
Engineering Plastics

In this research, thermoplastic polyimide (TPI) were welding via friction stir spot welding (FSSW) in order to evaluate the feasibility of the technology. The welding tool with a tri-flute pin was used for keeping the welding effectiveness. The effect of the rotation speed and dwell time on the microstructure and shear strength was studied. The results shows that the number of gap defects between the shoulder affect zone and the pin affect zone decreased with the increase of the rotation speed. The boundary of the shoulder affect zone and the pin affect zone was no clear when increasing the dwell time from 10 s to 20 s. Long dwell time could increase the mixing time and reduce the materials viscosity, which made the structure was denser. The maximal shear strength was obtained 85.5% of the base materials. The differential scanning calorimetry (DSC) results indicated that the melting behaviour of different regions was no obvious difference. It indicated that FSSW had a feasible and potential technology to join the high temperature resistant engineering plastics.

Analysis of Temperature and Plastic Flow During Friction Stir Spot Welding Using Particle Method With Elastic-Plastic Model

2008 ◽  
Author(s):  
Shigeki Hirasawa ◽  
Harsha Badarinarayan ◽  
Kazutaka Okamoto ◽  
Toshio Tomimura
Keyword(s):  
Temperature Distribution ◽  
Flow Pattern ◽  
Plastic Flow ◽  
Spot Welding ◽  
Rotation Speed ◽  
Particle Method ◽  
Metal Plate ◽  
Friction Stir Spot Welding ◽  
Friction Stir ◽  
Metal Material

Friction stir spot welding (FSSW) is a new metal-joining process, and a numerical simulation code to calculate optimal welding conditions is desired. In this paper, we analyzed temperature distribution and plastic flow during FSSW process by solving the elastic-plastic deformation equations using the particle method. Calculation results indicate that, temperature distribution is circler patterns and the temperature below the rotation tool is 300 °C at 0.7 s when the diameter of the tool is 8 mm and the rotation speed is 2500 rpm. The material of the metal plate near the outside of the tool protrudes to cause the burr. The calculation result is similar to our experimental result. Plastic flow pattern of material in the metal plate is obtained. The obtained complex flow pattern is important to mix metal material and the weld strength of FSSW. The length of the pin of the tool, the tool diameter, the tool rotation speed, and the tool plunge speed are important parameters for mixing of metal material. The mixing of metal material below the concave shoulder is strong.

scholarly journals Microstructures Evolution in Refill Friction Stir Spot Welding of Al-Zn-Mg-Cu Alloy

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 145 ◽  
Author(s):  
Yunqiang Zhao ◽  
Chunlin Dong ◽  
Chungui Wang ◽  
Shu Miao ◽  
Jinhong Tan ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Heat Input ◽  
Spot Welding ◽  
Dynamic Recovery ◽  
Aluminum Matrix ◽  
Friction Stir Spot Welding ◽  
High Density ◽  
Friction Stir ◽  
Cu Alloy ◽  
Welding Heat Input

In this study, Al-Zn-Mg-Cu alloy was refill friction spot welded, and the precipitates, dislocation, recovery, and recrystallization characteristics were focused. In the stir zone (SZ), continues dynamic recrystallization occurs under the intense plastic deformation. All the original GP (II) zones and η’ precipitates dissolved into the aluminum matrix under the welding heat input, and the stable η and E precipitates remained. In the thermo-mechanically affected zone (TMAZ), high-density dislocations and subgrains boundaries can be observed. The continued dynamic recrystallization was not activated and only dynamic recovery occurs. Sub-boundaries and high-density dislocations in this zone can be observed. In this zone, the η precipitates are coarsened and dissolution is the main evolution mechanism for the GP (II) zones and η’ precipitates. In the heat-affected zone (HAZ), no dislocation was induced and all the initial precipitates were coarsened under the welding heat input. The HAZ, the TMAZ, and the SZ constitute a soft region in the refill friction stir spot welding (RFSSW) joint, and the minimum value located at the interface between the HAZ and the TMAZ.

Study on Friction Stir Spot Welding Procedure of AZ31 Magnesium Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 1437-1441
Author(s):  
Cheng Gang Ding ◽  
Chuan Jun Guo ◽  
Gao Feng Quan ◽  
Feng Wu
Keyword(s):  
Magnesium Alloy ◽  
Spot Welding ◽  
Rotation Speed ◽  
Orthogonal Design ◽  
Shear Resistance ◽  
Friction Stir Spot Welding ◽  
Az31 Magnesium Alloy ◽  
Welding Parameters ◽  
Resistance Force ◽  
Friction Stir

The study has examined the influence of FSSW (friction stir spot welding) parameters (rotation speed, downward compression and welding period) on mechanical property (shear resistance force) by conducting FSSW experiments on 3mm-thick AZ31 magnesium alloy plates under the orthogonal design. According to the experiment result, welding period is the major factor that decides the shear resistance force of FSSW joints, optimum welding parameters are: rotation speed(RS) 2450r/min, welding period(WP) 8s, downward compression of the tool shoulder(DCTS) 0.2mm. Microstructure observations show that tiny and even equiaxial grains are formed in WN (Weld nugget zone) and coarse grains with uneven sizes are formed in TMAZ(thermo-mechanically affected zone) and HAZ (Heat affected zone).

AA5052 sheets welded by protrusion friction stir spot welding: High mechanical performance with considering sheets thickness at low dwelling time and tool rotation speed

2019 ◽  
Vol 233 (16) ◽  
pp. 5836-5847 ◽  
Author(s):  
N Farmanbar ◽  
SM Mousavizade ◽  
M Elsa ◽  
HR Ezatpour
Keyword(s):  
Mechanical Properties ◽  
Spot Welding ◽  
Dwell Time ◽  
Mechanical Performance ◽  
Rotation Speed ◽  
Peak Load ◽  
Friction Stir Spot Welding ◽  
Friction Stir ◽  
Tool Rotation Speed ◽  
Tool Rotation

In the present work, AA5052 sheets with thickness of 1 mm were successfully welded by protrusion friction stir spot welding as a low cost single-step method with a simple design that produces the no-keyhole joints with special mechanical properties at short dwell time and low tool rotation speed. By using suitable process parameters, the process is able to produce welds with superior mechanical performance in items of peak load and energy absorption compared to other techniques. The plunging depth and dwell time in this method were set as 0.2 mm and 6 s, respectively. The tool rotation speed was changed as 500, 800, 1250, and 1600 r/min to determine the optimum condition based on the microstructural and mechanical properties. Welds strength produced by the protrusion friction stir spot welding was directly related to the joint thickness, and the effective thickness of the upper sheet was maximum at 500 r/min. Protrusion friction stir spot welding joints presented circumferential failure mode after tensile shear testing. Regarding the sheets thickness used in this study, the joints produced by the current work presented high load bearing ability at dwell time of 6 s and tool rotation speed of 500 r/min compared to other techniques.

Explicit Finite Element Analysis of the Plunge Stage of Tool in Friction Stir Welding

2009 ◽  
Vol 620-622 ◽  
pp. 233-236 ◽  
Author(s):  
Wen Ya Li ◽  
Min Yu ◽  
Jing Long Li ◽  
Da Lu Gao
Keyword(s):  
Finite Element ◽  
Friction Stir Welding ◽  
Spot Welding ◽  
Rotation Speed ◽  
Friction Stir Spot Welding ◽  
High Temperature Region ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Friction Stir ◽  
Explicit Finite Element Analysis

The investigation of the plunge stage of the tool during friction stir welding (FSW) is the basis of understanding the nature of FSW, which is especially important for friction stir spot welding. In this study, the plunge stage of FSW tool was numerically examined by dynamic explicit finite element method with more attention to the temperature evolution. It was found that the high temperature region around the stirred zone extended with increasing the rotation speed. The heat affected zone expanded with the increase of inserting time, but the highest temperature around the stirred zone changed little. The range of the stirred zone changed little with the variations of the rotation speed and inserting time. The simulation result on the temperature field was in comparable agreement with the experimental one.

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