The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

Sitthipong, Siva; Towatana, Prawit; Meengam, Chaiyoot; Chainarong, Suppachai; Muangjunburee, Prapas

doi:10.4186/ej.2018.22.3.51

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…Simpulan sementara bahwa kekerasan tertinggi diperoleh pada SZ sebesar 96,2-HV dengan menggunakan diameter pin 7 mm dan waktu tinggal 3 detik, sedangkan yang terendah adalah 42,1-HV menggunakan diameter pin 3 mm dan waktu tinggal 3 detik. Sebuah studi menyelidiki sifat kekerasan pada lasan titik gesekan dan pengadukan logam semi padat untuk paduan Aluminium 7075 dengan variasi kecepatan spindel dan waktu tinggal (Sitthipong dkk., 2018). Berdasarkan hal tersebut ditemukan bahwa nilai kekerasan mikro di zona las memiliki nilai ratarata sebesar 79,83-HV yang lebih rendah dari kekerasan logam dasar.…”

Section: Pendahuluanunclassified

Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112

et al. 2022

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Issues in friction stir spot welding focus mainly on the mechanical characteristic affected by its Hardness. This Hardness must be maintained by evenly temperature distribution in weld zones during welding. The process parameters are mainly responsible for the development of the hardness of the friction stir spot weld. This study presented the hardness evaluations on the friction stir spot weld via the Hardness-Vickers test and analysis of the temperature distribution in the weld zones via the finite element method. The workpiece samples used in this study were Aluminium alloy 5052-H112 with a thickness of 2 millimeters in the lap-shear mode based on 3 main parameters at low and high levels of parameters configuration. The results obtained via the Hardness-Vickers tests exhibited a value of 42-HV located in the middle of the spot-weld center using a low-level parameters configuration. This value increased to 64-HV around the vicinity of the keyhole. And then the value decreased to 53-HV outside the keyhole, about 6 millimeters from the spot-weld center. Using high-level parameter configuration, the Hardness-Vickers value increased to 61-HV in the middle of the spot-weld center. The value then increased to 76-HV in the vicinity of the keyhole. Furthermore, the value decreased at 60-HV outside the keyhole, which ca 6 millimeters away from the spot-weld center. The temperature distribution of the weld zones achieved 480 oC in the vicinity of the keyhole using the low-level parameter configuration. Slowly, the temperature declined to 380 oC at 6 mm away from the friction spot-weld center in the HAZ. Using the high-level parameters configuration, the temperature distribution reached 540 oC in SZ, and slowly reduced to 425 oC in HAZ. Based on the results, it was found that by using high-level parameters configuration the hardness of the friction stirs spot weld exhibited better Hardness-Vickers value and evenly temperature distribution in the weld zones.

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Section: Pendahuluanunclassified

Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112

et al. 2022

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“…Soundararajan & Kovacevic [19] and Tanaka et al [20] point out that the thickness of the IMCs is proportional to the heat input. Also, for FSW, other authors studied the effect of variables such as welding speed [21] and rotation speed [22]- [24]; however, Torres & Ramírez [25], [26] achieve the elimination of IMCs, without reaching the increase in the strength in the welded joint. The works of Chen et al [27], [28] were crucial to establish the importance of the IMCs in the metallurgical character of the joint, and the requirement of forming IMCs with small and homogeneous thickness, which allows the solid continuity (metallurgical joining) for a better response to the mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Weldability of Aluminum-Steel Joints Using Continuous Drive Friction Welding Process, Without the Presence of Intermetallic Compounds

Hincapié¹,

Salazar²,

Restrepo³

et al. 2020

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Weldability of aluminum-steel joints has been studied mainly to avoid the formation of IMC. Nowadays, there are two ways to control the effect of FexAly in welding: 1) the elimination of IMCs or 2) the generation of a thin and homogeneous layer of these phases. In this way, the present work explores the first route, manufacturing joints aluminum-steel using solid state welding process. In order to evaluate the effect of the welding parameters, temperature measures were carried out during the process as well as the microstructural evaluation using optical microscopy and SEM. Finally, the welded joints were subject to tensile strength tests to evaluate their mechanical behavior and try to stablish the nature of the interfacial bonding between both metals. The microstructural characterization of the joints does not reveal the formation of IMCs; this is attributed to the low temperature reached during the process, lower than 545 °C. The welded joint failures in the TMAZ, in the low hardness zone, product of the over aging of the precipitates β". The nature of the bonding in the interface is not clear yet, but it is considered that the atomic diffusion trough the interface and adhesive bonding favors the joint.

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“…The crankshaft, transmitting power by using double strand roller chain to the propeller shaft, causes the shaft to bear high torsional loads. Due to the shaft's inconsistent shape and the change in the shaft shoulders cross sectional area, it accumulated a high concentration of stress at the shaft shoulder which made it a weak point and initiated cracks [11][12][13][14]. The stress amplitude of 517 MPa that occurs on the shaft shoulder immediately triggers the mechanism of fatigue in the shaft.…”

Section: Introductionmentioning

confidence: 99%

Life Extension of Propeller Shafts by Hardfacing Welding

Sitthipong

Towatana

Sitticharoenchai

et al. 2016

MSF

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At present the Cut-stern Kolek Boats of local fishermen at Kaoseng Community on the Coast of Songkhla Lake have a high rate of shaft failure. Consequently, the fishermen have spent lots of money on maintenance program of repairing shafts for a few years. Besides, the repairing cost, each time of the failure also causes water pollution from the leakage of grease. The incomplete transmission of power leads to engine overloading and fuel wasting. The investigation of the high failure rate of propeller shafts which were major machine component in power transmission illustrated the failure in normal fracture caused by the mechanisms of metal fatigue. Using the welding repair by shield metal arc welding process did not give the satisfied outcome because it created the short service life of reused propeller shafts after repairing. This research was aimed to study the metal fatigue behavior of long tail shafts in the Cut-stern Kolek boats and introduce the new method of welding repair process to prolong their service life. The experiment revealed that specimens resulted from the new welding repair process and the conventional one possessed different service life. The new process used the flux core which arc welding can prolong the service life of the shafts of boats more than 1.6 times of using the conventional method which is the electric welding by flux core arc welding. The research result will be extended to fishermen, in order to encourage them to become a part of sustainable inshore fisheries.

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The Influence of Parameters Affecting Mechanical Properties and Microstructures of Semi-Solid-Metal 7075 Aluminum Alloy by Using Friction Stir Spot Welding

Cited by 7 publications

References 32 publications

Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112

Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112

Weldability of Aluminum-Steel Joints Using Continuous Drive Friction Welding Process, Without the Presence of Intermetallic Compounds

Life Extension of Propeller Shafts by Hardfacing Welding

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