Microstructure and Mechanical Performance of Friction Stir Spot-Welded Aluminum-5754 Sheets

Pathak, Nikky; Bandyopadhyay, Kaushik; Sarangi, Mihir; Panda, Sushanta Kumar

doi:10.1007/s11665-012-0244-x

Cited by 60 publications

(21 citation statements)

References 33 publications

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“…The results of the previous investigations 7,13,14 stated that the tool-pin geometry significantly affects the hook geometry and thereby the shear-load capacity of FSSWs. An increase in the tensile shear load may be explained with the microstructural changes due to the heat generation at a stirring location.…”

Section: Tensile Shear Strengthmentioning

confidence: 99%

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Influence of the tool geometry and process parameters on the static strength and hardness of friction-stir spot-welded aluminium-alloy sheets

Güler¹

2015

Mater. Tehnol.

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In this study, the effects of the tool geometry and welding parameters on the friction-stir spot-welding properties of AA 5754-H111 were studied. Two different tool-pin geometries were used and tensile shear tests were carried out to compare the weld strength. Hardness observations were also done. The optimum tool geometry for the mentioned material was determined as the circular pin tool and the tapered pin tool gave the lowest tensile shear load. Keywords: Al-alloys, friction-stir spot welding, mechanical properties, hardness V tej {tudiji so bili preu~evani vplivi geometrije orodja in parametrov varjenja na torno-vrtilno to~kasto varjenje zlitine AA 5754-H111. Dve razli~ni geometriji konice orodja sta bili uporabljeni in opravljeni so bili natezni stri`ni preizkusi za primerjavo trdnosti zvara. Opravljene so bile tudi meritve trdote. Za ta material je bilo ugotovljeno, da je optimalna geometrija orodja v obliki okrogle konice, pri sto`~asti konici orodja pa je bila ugotovljena najmanj{a stri`na trdnost.

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Section: Tensile Shear Strengthmentioning

confidence: 99%

“…When the amount of the material stirred is large, the size of a bonded region also becomes large, resulting in a higher separation load. 14 …”

Section: Tensile Shear Strengthmentioning

confidence: 99%

Influence of the tool geometry and process parameters on the static strength and hardness of friction-stir spot-welded aluminium-alloy sheets

Güler¹

2015

Mater. Tehnol.

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“…The mechanical connection of the hook is a typical feature of FSSW joints [ 4 , 11 ]. The key factors affecting the formation of the hook are the presence or absence of the pin [ 12 , 13 ], the shape of the pin [ 14 ] and the insertion depth [ 15 ]. These welding parameters affect the microstructure [ 16 ], mechanical properties [ 17 ] and fracture mode [ 6 ] of joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Loading Methods on the Fatigue Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

Zhang

Zhao³

et al. 2020

Materials

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The energy evolution, fatigue life and failure behaviour of dissimilar Al/steel keyhole-free Friction stir spot welding (FSSW) joints were studied under different fatigue loads. The absorption energy of fatigue fracture, the fracture mechanism and the sensitivity of the fatigue limits to the fatigue load parameters were analysed. It was found that the stress ratio R determines the fatigue limit Ff, while the fatigue limit Ff is not sensitive to the loading frequency. The high-frequency fatigue load will increase the displacement deformation μ and fatigue fracture absorption energy Ea of the spot-welded joint, which are larger under asymmetric fatigue loading than those under symmetrical fatigue loading. At the same time, the symmetrical fatigue load can form the steady-state hysteresis loop, while asymmetric fatigue loading cannot, but asymmetric fatigue loading exhibits the displacement increment of fatigue softening. The fracture failure of spot-welded joints is a multiple crack source and the mixed-mode of ductile and brittle fracture mechanism, which exhibits typical fatigue striations in the fatigue fractures.

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“…It can only be applied as a spot welding on overlapping type materials. The method that was started to be used in the joining of aluminum alloys used in automotive industry in 2001, attracts attention in the other industry branches [14][15][16][17][18]. There are very few publications on polymers FSSW applications.…”

Section: Introductionmentioning

confidence: 99%

The Effects Of Critical Welding Parameters On Tensile-Shear Properties Of Friction Stir Spot Welded Polyethylene

Çevik¹,

Gülenç²,

Durgutlu³

2017

Journal of Polytechnic

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Çevik B., Gülenç B. and Durgutlu A., "The effects of critical welding parameters on tensile-shear properties of friction stir spot welded polyethylene", Politeknik Dergisi, 20(4): 945-951, (2017). Politeknik Dergisi, 2017; 20 (4) : 945-951 Journal of Polytechnic, 2017; 20 (4) ABSTRACTThe aim of this study was to investigate the weldability of high density polyethylene via friction stir spot welding method. Polyethylene sheets were joined with dwell times of 60 to 100 s, three different pin profiles (M6×1, M6×1.25, M6×1.5) and pin lengths of 3.75 to 4.75 mm by using rotational speed of 900 rpm and delay time of 45 s. During welding processes, the temperatures were measured under the welding centers. The tensile-shear tests were performed to welded samples. Also, macrostructures of welding nuggets were examined. The small welding nuggets were formed by using the lower dwell time. The melting in welding nugget occurred in the all dwell times during the welding. The dwell time affected on the friction temperature. The key (pin) hole closed when sufficient friction temperature (dwell times of 80 and 100 s). The pin profiles directly affected the welding quality. Large screw pitch range of the pin and the small pin length from 4.5 mm negatively affected the weld fracture load. Pin length of the stirring tool directly affected the quality of welding.Keywords: FSSW, polyethylene, welding parameters, tensile-shear properties. ÖZBu çalışmanın amacı, sürtünme karıştırma nokta kaynak yöntemi ile yüksek yoğunluklu polietilen malzemelerin kaynaklanabilirliğini araştırmaktır. Polietilen levhalar, 900 dev/dak devir sayısı ve 45 s bekleme süresi kullanılarak, 60-100 s karıştırma süresi, üç farklı pim profile (M6×1, M6×1.25, M6×1.5) ve 3.75-4.75 mm pim uzunluklarında birleştirilmiştir. Kaynak işlemi esnasında kaynak merkezinin altından sıcaklık ölçümleri yapılmıştır. Kaynaklı numunelere çekmek-kayma testleri uygulanmıştır. Ayrıca kaynak çekirdeklerinin makro görüntüleri incelenmiştir. Düşük karıştırma süreleri kullanıldığında küçük kaynak çekirdekleri oluşmuştur. Tüm karıştırma sürelerinde kaynak çekirdeğinde ergime meydana gelmiştir. Karıştırma süresi sürtünme sıcaklığına etki etmiştir. Yeterli sürtünme sıcaklığı (80 ve 100 s) oluştuğunda kaynak çekirdeğindeki anahtar (pim) değili kapanmıştır. Pim profili kaynak kalitesine doğrudan etki etmiştir. Büyük adımlı vidalı olan pim ve 4.5 mm'den küçük pim boyları kaynak kopma mukavemetini olumsuz etkilemiştir. Karıştırıcı takımın pim boyunun kaynak kalitesine doğrudan etki ettiği belirlenmiştir.Anahtar Kelimeler: SKNK, polietilen, kaynak parametreleri, çekme-kayma özellikleri.

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Microstructure and Mechanical Performance of Friction Stir Spot-Welded Aluminum-5754 Sheets

Cited by 60 publications

References 33 publications

Influence of the tool geometry and process parameters on the static strength and hardness of friction-stir spot-welded aluminium-alloy sheets

Influence of the tool geometry and process parameters on the static strength and hardness of friction-stir spot-welded aluminium-alloy sheets

Effect of Loading Methods on the Fatigue Properties of Dissimilar Al/Steel Keyhole-Free FSSW Joints

The Effects Of Critical Welding Parameters On Tensile-Shear Properties Of Friction Stir Spot Welded Polyethylene

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