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The micromorphology of the fracture area of 1 , 2 , and 3 welding specimens with the filler metal added is shown in Figure 6 , and the fracture position of each specimen is indicated by the red arrow in Figure 4.

It can be seen from Figure 6 that the fracture surface of the 1 test piece is smooth and flat, with some obvious white blocks and a small amount of dimples on it.

There are a large number of small and nearly uniform dimples as well as few small lumps on the fracture surface of the 2 test piece, showing obvious plastic fracture characteristics.

The fracture surface of the 3 test piece is also relatively flat, and there are some coarse lumps distributed on it.

It is difficult to see the dimple morphology, which shows the obvious brittle fracture characteristics. Based on the above analysis, we concluded that the fracture types were related to the connection strength of joints.

It is generally believed that there are both plastic fracture and brittle fracture. The well connected joints will show obvious plastic fracture characteristics, while the poorly connected joints will be prone to brittle fracture.

In order to further analyze the fracture mechanism of the joint and the composition of the microstructure lump, the energy spectrum analysis of the SEM morphology of points with red circles in 1 , 2 , and 3 samples was carried out.

The energy spectrum diagram is shown in Figure 7. According to the diagram, the white lump contained not only a great deal of aluminium and zinc but also a small amount of C and O, so it could be carbonates left behind by the surface film formed by aluminium alloy, O, and CO 2.

The presence of this surface film increased the brittleness of the joint and reduced its shear load. The 3 specimen had lower shear load due to the high content of the lumps, and the low content of lumps in the 2 specimen led to higher shear load.

All of the three samples contained Al and Zn, which indicated that the aluminium-zinc solder with a lower melting point melted first and spread out with the increase of temperature in the FSSW process.

Fe existing in the 2 test piece formed compounds with Al. Yu Haiyang et al. It confirmed that both mechanical connection and metallurgical bonding existed at the aluminium-steel friction stir spot welding joint.

Different heat input led to different metallurgic degrees of the joint, and different parameters of FSSW also brought about different joint strength.

The parameter comparison showed that the rotating speed of the three test pieces was the same, but the retention time and pressing depth of the mixing head were different.

Compared with the 1 test piece, the 2 test piece had longer residence time and greater pressing depth, so its heat input was relatively large and the solder diffusion was sufficient, which increased the metallurgical binding capacity of the joint.

Meanwhile, the greater pressing depth facilitated the mechanical binding of the joint, improving the plasticity and shear load of the joint.

The highest shear load could reach Excessive heat input due to long residence time and large pressing depth of the mixing head resulted in coarse massive structure in sample 3 Figure 6 , making the joint brittle and easy to form brittle phase.

Therefore, the shear load of sample 3 was low. The geometric model of steel DP and aluminium alloy adopting the same joint form, size, and test parameters was established Figure 8 [ 31 , 32 ].

The heat source model is shown in Figure 9 [ 33 — 36 ]. The reason was that compared to the edge of the joint, a lot of heat was produced due to larger linear velocity and heat was hard to dissipate small in this area.

Located at the centre of heat source, where the temperature was the highest, the galvanized steel sheet DP with a high melting point could be more easy to reach the superplastic state, so it had better plastic fluidity, capable of improving the performance of the mixing head and the quality of welded joints.

Uneven temperature distribution and low plasticity made it difficult to form the joint and caused the decrease in shear resistance. The universal superplasticity enabled the readily formation of the joint and improved the shear resistance, which was consistent with the results obtained by the orthogonal test and the shear resistance test.

The red superplastic area was uneven due to the high mixing speed, and the welding joint prepared showed lower performance.

The simulation results were consistent with the rotating speed of the test process parameters. The ANSYS finite element software was used for simulation, which clearly showed the temperature and metal flow state in the welding process as well as their effects on the joint bonding strength.

It also revealed the cause of joint fracture. During the test, a small hole with a diameter of 1. Then, the small hole was filled and compacted with resin glue.

During welding, the recorder recorded the time-temperature curve of the measuring point at different rotating speeds. The comparison between the measured temperature and the calculated temperature at the same point is shown in Figure FSSW was demonstrated to be a solid-state welding technology, which could not only ensure that the metal with a lower melting point did not melt but also render better plastic fluidity to the metal with a higher melting point under the optimal welding parameters, capable of effectively reducing the formation of defects in the fusion welding.

The joint with high connection strength and the shear load as high as The simulated temperature is basically consistent with the measured temperature, which proves that the heat source model is accurate and the optimized process parameters are reasonable.

The authors declare that there are no conflicts of interest regarding the publication of this paper. This is an open access article distributed under the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Journal overview. Special Issues. Academic Editor: Pavel Lejcek. Received 28 Feb Revised 12 May Accepted 25 May Published 17 Jun Abstract Friction stir welding FSW is the most popular and efficient method for solid-state joining of similar or dissimilar metals and alloys.

Introduction Aluminium alloy has small density, high specific strength, good conductivity, and corrosion resistance. Materials and Methods 2.

Table 1. Figure 1. Welding joint scheme. Figure 2. Table 2. Three factors and three levels selected in the orthogonal test. Table 3. Figure 3.

Figure 4. Figure 5. Microstructure of each area on two sides of the joint steel sheet. Figure 6. Figure 7. EDS analysis of the points circled in Figure 6.

Figure 8. Figure 9. Figure Cloud pictures of temperature distribution corresponding to different dwell times.

Comparison of measured and simulated results of lap joint temperature. References R. Mishra and Z.

Uematsu, K. Tokaji, Y. Tozaki, T. Kurita, and S. Zhang, M. Liu, J. Jiang et al. Limiting friction is the maximum value of static friction, or the force of friction that acts when a body is just on the verge of motion on a surface.

Devices, such as ball bearings can change sliding friction into the less significant rolling friction. One technique used by railroad engineers is to back up the train to create slack in the linkages between cars.

This allows the train to pull forward and only take on the static friction of one car at a time, instead of all cars at once, thus spreading the static frictional force out over time.

Generally, when moving an object over a distance: To minimize work against static friction, the movement is performed in a single interval, if possible.

To minimize work against kinetic friction, the movement is performed at the lowest velocity that's practical.

This also minimizes frictional stress. A common way to reduce friction is by using a lubricant , such as oil, that is placed between the two surfaces, often dramatically lessening the coefficient of friction.

The science of friction and lubrication is called tribology. Lubricant technology is when lubricants are mixed with the application of science, especially to industrial or commercial objectives.

Superlubricity , a recently-discovered effect, has been observed in graphite : it is the substantial decrease of friction between two sliding objects, approaching zero levels - a very small amount of frictional energy would be dissipated due to electronic and atomic vibrations [3].

Lubricants to overcome friction need not always be thin, turbulent fluids or powdery solids such as graphite and talc ; acoustic lubrication actually uses sound as a lubricant.

According to the law of conservation of energy , no energy should be lost due to friction. The kinetic energy lost is transformed primarily into heat or motion of other objects.

In some cases, the "other object" to be accelerated may be the Earth. A sliding hockey puck comes to rest due to friction both by changing its energy into heat and accelerating the Earth in its direction of travel by an immeasurably tiny amount.

Since heat quickly dissipates, and the change in velocity of the Earth cannot be seen, many early philosophers, including Aristotle [4] , wrongly concluded that moving objects lose energy without a driving force.

Sign In Don't have an account? Start a Wiki. In kinetic friction, the frictional force resists the motion of an object.

For the case of a brick sliding on a clean wooden table, the coefficient of kinetic friction is about 0.

The frictional force itself is directed oppositely to the motion of the object. Coefficient of friction. Info Print Cite.

Submit Feedback. Thank you for your feedback. Coefficient of friction physics.

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Rubber in contact with other surfaces can yield friction coefficients from 1. Limiting friction is the maximum value of static friction, or the force of friction that acts when a body is just on the verge of motion on a surface. Uneven temperature distribution and low go here made it difficult to form the joint and caused the decrease in shear resistance. The initial force to get more info object moving is often dominated ion. References R. Gta 5 Spezielle, H. Research has been carried out to seek processes for producing high-quality joints, and a great deal is about friction stir welding of dissimilar materials.

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