Weldability of High Strength Aluminum Alloys by Friction Stir Welding

Nakata, Kohei; Kim, Young Gon; Ushio, Masao; Hashimoto, Takenori; Jyogan, Shigetoshi

doi:10.2355/isijinternational.40.suppl_s15

Cited by 50 publications

(19 citation statements)

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“…These defects, if not minimized or eliminated, may lead to the degradation of mechanical properties of the joints. Defect formation in butt and lap joint configuration were investigated by many researchers [20][21][22][23][24]. Moreover, some defects such as kissing bond and joint line remnants, are typical to FSW.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Tool Pin Profiles on Mechanical and Microstructural Properties of Friction Stir Butt and Scarf Welded Aluminium Alloy 6063

Goel¹,

Siddiquee

Khan

et al. 2018

Metals

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Abstract:In the present study, friction stir welding (FSW) of butt and scarf joints of Al 6063-T6 were investigated. Five different tool pin profiles (cylindrical, tapered cylindrical, square, triangular, and hexagonal) were applied for performing welding. Scarf joint, being a new joint configuration, was used and effect of pin profiles was investigated on this type of joint configuration. The effect of pin profiles on microstructure, micro-hardness, impact and tensile properties of friction stir welded Al 6063-T6 was investigated. Scanning electron and optical microscopy were employed to characterize the different zones of welded joints. A thorough discussion on correlation between mechanical properties and microstructure has been made. In addition, the formation of various defects during the FSW was discussed with the help of fractography of the fractured surfaces.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Effect of Tool Pin Profiles on Mechanical and Microstructural Properties of Friction Stir Butt and Scarf Welded Aluminium Alloy 6063

Goel¹,

Siddiquee

Khan

et al. 2018

Metals

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“…Surface defects like grooving or cavities were observed in the samples welded in higher heat input rate (R t =V). [12][13][14] This grooving was occurred by a tool seizure of the base materials. The proper joints were able to cut out without failure for microstructural observation and tensile testing sample.…”

Section: Rapid Publicationmentioning

confidence: 99%

“…The proper welding condition for dissimilar A5052-H and AZ31B FSW joint were more limited region than that for A5XXX or AZ31B FSW joint. [11][12][13][14][15][16][17][18] 3.2 Microstructural observation and hardness distributions As-received A5052-H alloy had 20$30 [mm] of the grain diameter. After FSW, the grain size was refined to c.a.…”

Section: Rapid Publicationmentioning

confidence: 99%

Dissimilar Welding of Al and Mg Alloys by FSW

et al. 2008

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Microstructures and mechanical properties of dissimilar welding joint between Al alloy and Mg alloy by Friction Stir Welding (FSW) were investigated in comparison with laser welding of the same combination. Dissimilar joint of Al and Mg alloy by laser welding was very brittle because of building up Mg 17 Al 12 inter metallic compounds in fusion zone. On the other hand, FSW is anticipated to welding dissimilar alloys with enough joint strength because it is a solid-state process without melting. In this paper, FSW was carried out to make dissimilar butt joints of Al alloy and AZ31 magnesium alloy with various tool rotational speed and welding speed. These joints showed higher hardness in their stir zones than that of parent AZ31 alloy because of Mg-Al inter metallic compound formation. However, the hardness of stir zone was lower than that of fusion zone of laser welding, and was changed with the welding parameters of tool rotational speed and welding speed (i.e. heat input ratio of FSW). The optimum welding conditions of Mg and Al dissimilar FSW joint and the influence of inter metallic compound distribution with mixing of materials in stir zone were discussed.

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“…However, inner defects, which were invisible, such as voids, were not detected via X-ray radiography. 12) Tool material is a main factor for the FSW weldability of high-melting-point materials such as steel. As such materials require excellent strength and wear resistance at a high temperature as basic characteristics, ceramics and tungsten carbide tools are being applied.…”

Section: Quality Of the Welded Jointsmentioning

confidence: 99%

Mechanical Properties and Tool Life of Friction-Stir-Welded DP590 Using the Si<sub>3</sub>N<sub>4</sub> Tool

Kim

et al. 2014

Mater. Trans.

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Early studies have been conducted on the friction stir welding of steel, tungsten (W), molybdenum (Mo), tungsten carbide, and the like for the production of tools, but the tool materials were significantly worn out and deformed while they were being joined. So far, the polycrystalline cubic boron nitride (PCBN) tool, which is very strong at high temperatures and is wear-resistant, has performed relatively well, but the improvement of its productivity is limited by its high manufacturing cost. In this study, 1.4 mm-thick DP590 steel was subjected to FSW using the ceramic material of a Si 3 N 4 tool. The main process parameters of the butt joint at rotation speeds of 6001,000 rpm and traveling speeds of 180300 mm/min were determined through the bead-on-plate experiment. Also, the tensile strength, hardness, and Charpy impact properties of each FSW joint were evaluated, the full extent of the wear was measured and the tool life of the PCBN tool that was about four times as costly to produce was compared with the maximum joint length to determine the durability of the tool.

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Weldability of High Strength Aluminum Alloys by Friction Stir Welding

Cited by 50 publications

References 0 publications

Investigation on the Effect of Tool Pin Profiles on Mechanical and Microstructural Properties of Friction Stir Butt and Scarf Welded Aluminium Alloy 6063

Investigation on the Effect of Tool Pin Profiles on Mechanical and Microstructural Properties of Friction Stir Butt and Scarf Welded Aluminium Alloy 6063

Dissimilar Welding of Al and Mg Alloys by FSW

Mechanical Properties and Tool Life of Friction-Stir-Welded DP590 Using the Si<sub>3</sub>N<sub>4</sub> Tool

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