Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Chowdhury, Shahereen; Chen, D.L.; Bhole, S.D.; Cao, X.

doi:10.1016/j.msea.2010.06.012

Cited by 154 publications

(67 citation statements)

References 61 publications

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“…Many researchers have investigated the material flow patterns during FSW by analyzing the characteristics of welding defects [24][25][26][27]. Inversely, in this study, the material flow patterns are utilized to explain the formation mechanisms of welding defects.…”

Section: Materials Flow Patterns During Underwater Fswmentioning

confidence: 99%

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Zhang

Liu

2012

Metallogr. Microstruct. Anal.

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Underwater friction stir welding (FSW) has been demonstrated to be a promising method for strength improvement of heat-treatable aluminum alloy joints. However, when improper welding parameters are utilized, welding defects, such as voids can be produced in the joints, leading to dramatically deteriorated mechanical properties. Thus to obtain high-quality underwater joints, it is necessary to understand the variables that promote the formation of these defects. In this study, the characteristics of welding defects in underwater joints were examined, and the formation mechanisms of the defects were investigated by analyzing the material flow patterns during underwater FSW. The results indicated that welding defects can occur at both low-and high-rotation speeds (HRS). The defects formed at HRS can be divided into two types according to the welding speed. When a HRS and a low welding speed are chosen, the material beneath the tool shoulder tends to be extruded into the pin stirred zone (PSZ) after flowing back to the advancing side. This results in a turbulent flow condition, creating void defects in the PSZ. When a high welding speed is coupled with the HRS, a large amount of material from the thermo-mechanically affected zone is dragged into the pin hole, which causes the material of the shoulder stirred zone to fill the pin hole in a downward flow direction. This leads to turbulent flow in PSZ, and creates voids or even groove defects in the as-welded joints.

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Section: Materials Flow Patterns During Underwater Fswmentioning

confidence: 99%

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Zhang

Liu

2012

Metallogr. Microstruct. Anal.

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“…Although FSW is often employed as a technique for welding aluminum alloys [13,14], but it has also been used for welding of many other metals such as magnesium alloys [15,16], titanium alloys [17,18] and metal-matrix composites [19,20]. Moreover, similar or dissimilar materials in different thickness can be welded by this method.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Different Finite Element Methods in the Thermal Analysis of Friction Stir Welding (FSW)

Meyghani

Awang

Emamian

et al. 2017

Metals

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Friction Stir Welding (FSW) is a novel kind of welding for joining metals that are impossible or difficult to weld by conventional methods. Three-dimensional nature of FSW makes the experimental investigation more complex. Moreover, experimental observations are often costly and time consuming, and usually there is an inaccuracy in measuring the data during experimental tests. Thus, Finite Element Methods (FEMs) has been employed to overcome the complexity, to increase the accuracy and also to reduce costs. It should be noted that, due to the presence of large deformations of the material during FSW, strong distortions of mesh might be happened in the numerical simulation. Therefore, one of the most significant considerations during the process simulation is the selection of the best numerical approach. It must be mentioned that; the numerical approach selection determines the relationship between the finite grid (mesh) and deforming continuum of computing zones. Also, numerical approach determines the ability of the model to overcome large distortions of mesh and provides an accurate resolution of boundaries and interfaces. There are different descriptions for the algorithms of continuum mechanics include Lagrangian and Eulerian. Moreover, by combining the above-mentioned methods, an Arbitrary Lagrangian-Eulerian (ALE) approach is proposed. In this paper, a comparison between different numerical approaches for thermal analysis of FSW at both local and global scales is reviewed and the applications of each method in the FSW process is discussed in detail. Observations showed that, Lagrangian method is usually used for modelling thermal behavior in the whole structure area, while Eulerian approach is seldom employed for modelling of the thermal behavior, and it is usually employed for modelling the material flow. Additionally, for modelling of the heat affected zone, ALE approach is found to be as an appropriate approach. Finally, several significant challenges and subjects remain to be addressed about FSW thermal analysis and opportunities for the future work are proposed.

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“…Subsequently this welding process has been used for joining magnesium [2], titanium [3] and copper alloys [4], stainless steels [5], steels [6] and thermoplastics [7]. Friction stir spot welding (FSSW) is a version of the FSW process.…”

Section: Introductionmentioning

confidence: 99%

Effect of tool geometry on friction stir spot welding of polypropylene sheets

Bilici

2012

Express Polym. Lett.

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Abstract. The effects of tool geometry and properties on friction stir spot welding properties of polypropylene sheets were studied. Four different tool pin geometries, with varying pin angles, pin lengths, shoulder diameters and shoulder angles were used for friction stir spot welding. All the welding operations were done at the room temperature. Lap-shear tensile tests were carried out to find the weld static strength. Weld cross section appearance observations were also done. From the experiments the effect of tool geometry on friction stir spot weld formation and weld strength were determined. The optimum tool geometry for 4 mm thick polypropylene sheets were determined. The tapered cylindrical pin gave the biggest and the straight cylindrical pin gave the lowest lap-shear fracture load.

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Tensile properties of a friction stir welded magnesium alloy: Effect of pin tool thread orientation and weld pitch

Cited by 154 publications

References 61 publications

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

Characteristics and Formation Mechanisms of Welding Defects in Underwater Friction Stir Welded Aluminum Alloy

A Comparison of Different Finite Element Methods in the Thermal Analysis of Friction Stir Welding (FSW)

Effect of tool geometry on friction stir spot welding of polypropylene sheets

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