Temperature Field in the Vicinity of FSW-Tool During Friction Stir Welding of Aluminium Alloys

Maeda, Masakatsu; Liu, H.; Fujii, Hidetoshi; Shibayanagi, Toshiya

doi:10.1007/bf03266478

Cited by 42 publications

(18 citation statements)

References 25 publications

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“…At the measurement from the specimen welded in 400 rpm and 240 mm/min, the temperatures at #1 and #4 increased to over 205 and the maximum temperature at #7 was 175 . It is notable that even though Tang [6] did not observe any temperature variation between the advancing and retreating side, recent study by Commin [5,7] showed clear difference of temperature distribution between the advancing and retreating side, which supports the results of this study. presented here since the radiographic inspection detects relatively large amount of voids and therefore invalidated.…”

Section: Resultssupporting

confidence: 88%

“…It is confirmed that the grain size depends on the amount of the heat input which is a function of rotating rate and traveling speed. Difference of temperature distribution between the advancing and retreating side is reported to support the Commin's work [5,7]. The effect of welding speed is sensitive to the mechanical properties of the specimens welded at 800 rpm, which failed on advancing side of the joint.…”

Section: Resultssupporting

confidence: 68%

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Effects of Friction Stir Welding Speed on AA2195 alloy

Lee

Min

2016

MATEC Web of Conferences

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Abstract. The application of friction stir welding (FSW) to aerospace has grown rapidly due to the high efficiency and environmental friendly nature of the process. FSW is achieved by plastic flow of frictionally heated material in solid state and offers many advantages of avoiding hot cracking and limiting component distortion. Recently low density, high modulus and high strength AA2195 are used as substitute for conventional aluminum alloys since the weight saving is critical in aerospace applications. One of the problems for this alloy is weld metal porosity formation leading to hot cracking. Combination of FSW and AA2195 provides synergy effect to improve mechanical properties and weight saving of aerospace structure such as cryogenic fuel tanks for launch systems. The objective of this paper is to investigate the effect of friction stir welding speed on mechanical and microstructural properties of AA2195. The friction stir welded materials were joined with four different tool rotation speeds (350~800 rpm) and five welding speeds (120~360 mm/min), which are the two prime welding parameters in this process.

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Section: Resultssupporting

confidence: 88%

Section: Resultssupporting

confidence: 68%

Effects of Friction Stir Welding Speed on AA2195 alloy

Lee

Min

2016

MATEC Web of Conferences

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“…It was noted that the dissimilar FSW between two aluminum alloys might be difficult since they have quite different deformation characteristics at high temperature. Because the rotating tool on the AS shows the same direction of self-rotation and traveling along the butt interface, the material in the AS generally experiences a higher strain rate and higher temperature than that in the RS [26,27]. Therefore, the materials with a low melting point are usually placed on the RS during the dissimilar welding process between two materials with quite different melting points, for example, dissimilar FSW between aluminum and steel alloys [28,29].…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welding between Ultrafine Grained 1050 and 6061-T6 Aluminum Alloys

Yangshan

Tsuji

Fujii

2016

Metals

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Abstract:The ultrafine grained (UFGed) 1050 Al plates with a thickness of 2 mm, which were produced by the accumulative roll bonding technique after five cycles, were friction stir butt welded to 2 mm thick 6061-T6 Al alloy plates at a different revolutionary pitch that varied from 0.5 to 1.25 mm/rev. In the stir zone, the initial nano-sized lamellar structure of the UFGed 1050 Al alloy plate transformed into an equiaxial grain structure with a larger average grain size due to the dynamic recrystallization and subsequent grain growth. However, an equiaxial grain structure with a much smaller grain size was simultaneously formed in the 6061 Al alloy plates, together with coarsening of the precipitates. Tensile tests of the welds obtained at different welding speeds revealed that two kinds of fracture modes occurred for the specimens depending on their revolutionary pitches. The maximum tensile strength was about 110 MPa and the fractures were all located in the stir zone close to the 1050 Al side.

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“…They determine whether the welding process will produce a good weld, influencing the residual stresses, the microstructure and the strength of welds. Several studies have measured temperatures in FSW using thermocouples [8][9][10], but only a few have been involved in experimental analysis using thermography [9] and still less on laser-assisted friction stir welding. Employing thermocouples, Xu et al [8] showed that the temperature decreases with decreasing the transverse speed and increases with increasing the rotational speed.…”

Section: Temperature Field In Fsw and Laser-assisted Fsw Processesmentioning

confidence: 99%

Residual Stress in Friction Stir Welding and Laser-Assisted Friction Stir Welding by Numerical Simulation and Experiments

Casavola¹,

Cazzato²,

Moramarco³

2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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The friction stir welding (FSW) has become an important welding technique to join materials that are difficult to weld by traditional fusion welding technology. In this technique, the material is not led to fusion, and the joint is the result of the rotation and movement along the welding line of the tool that causes softening of material due to frictional heat and the stirring of the same. In FSW, the temperature does not reach the fusion value of the materials, and this helps to decrease the residual stress values. However, due to the higher force involved in the weld and, thus, the rigid clamping used, the residual stresses are not low in general in this technique. As the presence of high residual stress values influences the post-weld mechanical properties, e.g. fatigue properties, it is important to investigate the residual stress distribution in the FSW welds. In this chapter, two numerical models that predict temperatures and residual stresses in friction stir welding and laser-assisted friction stir welding will be described. Experimental measurements of temperatures and residual stress will be carried out to validate the prediction of the models.

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Temperature Field in the Vicinity of FSW-Tool During Friction Stir Welding of Aluminium Alloys

Cited by 42 publications

References 25 publications

Effects of Friction Stir Welding Speed on AA2195 alloy

Effects of Friction Stir Welding Speed on AA2195 alloy

Microstructure and Mechanical Properties of Dissimilar Friction Stir Welding between Ultrafine Grained 1050 and 6061-T6 Aluminum Alloys

Residual Stress in Friction Stir Welding and Laser-Assisted Friction Stir Welding by Numerical Simulation and Experiments

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