Effect of gap on FSW joint formation and development of friction powder processing

Fujii, Hidetoshi; Ji, Young Seok; Yangshan, Sun; Morisada, Yoshiaki

doi:10.1179/136217109x12568132624244

Cited by 55 publications

(23 citation statements)

References 20 publications

(30 reference statements)

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“…These were thought to be caused by the applied welding speed. An increased welding speed reduced the heat input to the welding zone [4,11,12]. As a result, the heat generated in the root portion of the weld nugget was not sufficient.…”

Section: Macrostructural Analysismentioning

confidence: 99%

See 1 more Smart Citation

Effect of welding speed on the mechanical properties and weld defects of 7075 Al alloy joined by FSW

Çevik¹,

Özçatalbaş²,

Gülenç³

2016

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In this study, 7075-T651 Al alloys were joined by friction stir welding (FSW) at a fixed rotational speed and different welding speeds. The stirring tool used in the welding processes was comprised of a shoulder of 20 mm in diameter and modified M6 × 1 HSS hand taps used as pins. The FSW was performed at a rotational speed of 1600 rpm and at welding speeds of 20, 40, and 60 mm min −1 . Mechanical and metallographic tests were carried out on the welded joints and the effects of the welding speed on the mechanical and metallurgical properties of the welded specimens were investigated. Welding speed significantly affected the microstructure and mechanical properties of the joining. Results showed that the average grain size of the weld nugget was reduced as welding speed was increased. In addition, it was found that high welding speed negatively affected the mechanical properties of the weld nugget.K e y w o r d s : FSW, aluminium alloy, mechanical properties, micro defects, microstructure

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Section: Macrostructural Analysismentioning

confidence: 99%

“…There have been a number of studies in the literature which have been conducted on the joining of Al and its alloys by FSW. Moreover, studies investigating the complex microstructural aspects and microstructure defects of materials joined by the FSW process continue to be carried out [4][5][6][7][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of welding speed on the mechanical properties and weld defects of 7075 Al alloy joined by FSW

Çevik¹,

Özçatalbaş²,

Gülenç³

2016

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show abstract

“…4). In various investigations, formation of AlCu and Al 2 Cu intermetallic compounds have been reported after FSW and/or FSP of aluminum alloys in the presence of copper powder and also in FSW of copper plates to aluminum plates ( Ref 5,22,[40][41][42][43][44].…”

Section: Microstructurementioning

confidence: 99%

The Effect of Premixed Al-Cu Powder on the Stir Zone in Friction Stir Welding of AA3003-H18

Abnar

Kazeminezhad

Kokabi

2014

J. of Materi Eng and Perform

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In this research, 3-mm-thick AA3003-H18 non-heat-treatable aluminum alloy plates were joined by friction stir welding (FSW). It was performed by adding pure Cu and premixed Cu-Al powders at various rotational speeds of 800, 1000, and 1200 rpm and constant traveling speeds of 100 mm/min. At first, the powder was filled into the gap (0.2 or 0.4 mm) between two aluminum alloy plates, and then the FSW process was performed in two passes. The microstructure, mechanical properties, and formation of intermetallic compounds were investigated in both cases of using pure Cu and premixed Al-Cu powders. The results of using pure Cu and premixed Al-Cu powders were compared in the stir zone at various rotational speeds. The copper particle distribution and formation of Al-Cu intermetallic compounds (Al 2 Cu and AlCu) in the stir zone were desirable using premixed Al-Cu powder into the gap. The hardness values were significantly increased by formation of Al-Cu intermetallic compounds in the stir zone and it was uniform throughout the stir zone when premixed Al-Cu powder was used. Also, longitudinal tensile strength from the stir zone was higher when premixed Al-Cu powder was used instead of pure Cu powder.

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“…As a result, the position of the tool is also located on the left side of Structure C. The FSW gap becomes larger as the steps increase. In addition, the gap may not be joined after welding, and even if it is joined, the mechanical property values at the joint will be significantly reduced, thus having a great influence on the quality [12][13][14]. This study calculated the transverse shrinkage for each step of welding for a 2.5 mm thick aluminum battery housing structure with nine welding lines.…”

Section: Introductionmentioning

confidence: 99%

Welding Deformation Analysis, Using an Inherent Strain Method for Friction Stir Welded Electric Vehicle Aluminum Battery Housing, Considering Productivity

et al. 2019

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With the rise of electric vehicles, the use of battery modules, which are key units that drive vehicles, is increasing. The battery housing is the final form of a battery system mounted on electric vehicles, and is generally made of aluminum alloys, located at the bottom of the vehicle. The aluminum housing has a special shape to accommodate the battery module and is produced by welding extruded panels. This study applied friction stir welding (FSW) to weld 2.5 mm thin aluminum plates in order to improve the weldability and productivity. To increase productivity, we compared the mechanical properties after performing experiments under various FSW conditions. As a result, it was possible to derive speed-enabling welding conditions that can improve productivity without decreasing tensile strength. Deformation occurred in the structure during welding, causing gaps in the structure. Since these gaps have a significant influence on the degradation of mechanical properties after welding, the welding deformation at each step of welding must be calculated and reflected in the process. This study used the inherent strain method to calculate the deformation of each step of welding to apply automatic welding, and reduced the analysis time to 1/30 compared to the thermal elasto-plastic analysis method. Finally, this study verified the validity of the analysis method by comparing the experimental results with the numerical results using the inherent strain method. validation, S.K. and K.L.; formal analysis, S.K.; investigation, S.K. and Y.J.; resources, S.K. and K.L.; data curation, S.K. and K.L.; writing-original draft preparation, S.K.; writing-reviewing and editing, Y.J. and K.L.; visualization, S.K.; supervision, K.L.; project administration, K.L.; funding acquisition, K.L.

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Effect of gap on FSW joint formation and development of friction powder processing

Cited by 55 publications

References 20 publications

Effect of welding speed on the mechanical properties and weld defects of 7075 Al alloy joined by FSW

Effect of welding speed on the mechanical properties and weld defects of 7075 Al alloy joined by FSW

The Effect of Premixed Al-Cu Powder on the Stir Zone in Friction Stir Welding of AA3003-H18

Welding Deformation Analysis, Using an Inherent Strain Method for Friction Stir Welded Electric Vehicle Aluminum Battery Housing, Considering Productivity

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