Effect of Process Parameters on Temperature Distribution, Strain Rate and Flow-Stress During Friction Stir Welding of Aluminium Alloy

Siddiqui, Mohd Anees

doi:10.15623/ijret.2016.0518007

Cited by 1 publication

(2 citation statements)

References 7 publications

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“…Figure 5a represents the friction area of each tool pin, already shown in Table 3, while Figure 5b shows the cross-section area of the stir zone for dissimilar welds. The higher friction area between the progressive pin tools and the material to weld (Figure 5a) promoted an increase of the heat-input during welding, which reduced the flow stress of the material, as Siddiqui et al [27] mentioned. Although the lower flow stress was expected to decrease the torque, progressive pin tools provided an increase in the amount of material dragged by the tool at each revolution, as the tools' pin volumes suggest (Table 3) and the weld's cross sections in Figure 5b show, and therefore the torque increased.…”

Section: Welding Torque and Temperaturementioning

confidence: 85%

“…In the current study, as the diameter of the shoulder of all the tools was approximately the same, the difference in the friction area between the tools came from the pin area. Figure5arepresents the friction area of each tool pin, already shown in Table3, while Figure5bshows the cross-section area of the stir zone for dissimilar welds.The higher friction area between the progressive pin tools and the material to weld (Figure5a) promoted an increase of the heat-input during welding, which reduced the flow stress of the material, as Siddiqui et al[27] mentioned. Although the lower flow stress was expected to decrease the torque, progressive pin tools provided an increase in the amount of material dragged by the tool at each revolution, as the tools' pin volumes suggest (Table3) and the weld's cross sections in Figure5bshow, and therefore the torque increased.…”

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confidence: 85%

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Influence of Tool Geometry and Process Parameters on Torque, Temperature, and Quality of Friction Stir Welds in Dissimilar Al Alloys

et al. 2021

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In the current investigation, the influence of the tool geometry, the position of the materials in the joint, the welding speed on the temperature and torque developed, and on the quality of the welds in dissimilar and tri-dissimilar T joints were analysed. The aluminium alloys used were AA2017-T4, AA6082-T6, and AA5083-H111 and the friction stir welds were performed with identical shoulder tools, but with either a pin with simple geometry or a pin with progressive geometry. Progressive pin tools proved to be a viable alternative in the production of dissimilar and tri-dissimilar welds, as they provide a larger tool/material friction area and a larger volume of dragged material, which promotes an increase in the heat generated and a good mixing of the materials in the stir zone, although they require a higher torque. Placing a stronger material on the advancing side also results in a higher temperature in the stir zone but requires higher torque too. The combination of these factors showed that tools with a progressive pin provide sound dissimilar and tri-dissimilar welds, unlike single-pin tools. The increase in the welding speed causes the formation of defects in the stir zone, even in tri-dissimilar welds carried out with a tool with a progressive pin, which impairs the fatigue strength of the welds.

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Section: Welding Torque and Temperaturementioning

confidence: 85%

mentioning

confidence: 85%