Preliminary study on the mechanical behavior of friction spot welds

Mazzaferro, José Antônio Esmerio; Rosendo, Tonilson de Souza; Mazzaferro, Cíntia Cristiane Petry; Ramos, Fabiano Dornelles; Tier, Marco Antônio Durlo; Strohaecker, Telmo Roberto; Santos, J.F. dos

doi:10.1590/s0104-92242009000300007

Cited by 35 publications

(9 citation statements)

References 6 publications

(6 reference statements)

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“…To investigate the stress distribution and plastic deformation of the welds under shear tensile loading, a numerical model of FSpW welds was developed by Mazzaferro et al Figure shows the numerical model that was developed with Abaqus TM (Dassault Systémes, Villacoublay Cedex, France) and a schematic drawing that shows the stresses expected in the vicinity of the weld's longitudinal cross section under shear tensile loading. The resistance of the weld to the displacement of the sheets under shear tensile loading causes twisting of the joint.…”

Section: Discussionmentioning

confidence: 99%

Mechanical performance of AA6181 refill friction spot welds under Lap shear tensile loading

Rosendo

Tier

Mazzaferro

et al. 2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T This study investigates the fracture behaviour of refill friction spot welding welds under shear tensile loading. Overlap joints of 6181-T4 aluminium were produced in 1.7-mm sheets by varying the rotational speed from 1900 to 2900 rpm and the welding time from 2 to 3.4 s while keeping the plunge depth constant at 1.75 mm. After shear tensile tests, the samples were analysed using optical microscopy and scanning electron microscopy. The strength of the weld and its ductile/brittle behaviour are associated with the nucleation, growth and propagation of two types of cracks: circumferential cracks and annular cracks. Welds produced with longer welding times (≥3 s) and slower rotational speeds (1900 rpm) had higher strengths, low scattering and high energy absorption prior to failure, while welds produced with short welding times (2 to 2.4 s) resulted in poor joints, especially when they also used high rotational speeds.

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Section: Discussionmentioning

confidence: 99%

Mechanical performance of AA6181 refill friction spot welds under Lap shear tensile loading

Rosendo

Tier

Mazzaferro

et al. 2015

Fatigue Fract Eng Mat Struct

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“…11b. The crack initiates at hook tip for tensile stress concentration and propagates downward along with the downward hook in tensile shear test [5]. In the other side, the downward hook Fig.…”

Section: Fracture Behaviormentioning

confidence: 98%

“…H increases with plunge depth owing to the increment of plasticized material volume and heat input. Hook will reduce effective sheet thickness and induce stress concentration during tensile shear test, and the hook morphology will influence the crack path [5]. Thus, hook along with the joint-line remnant plays a great role in tensile shear properties and causes different fracture modes.…”

Section: Interface Characteristicmentioning

confidence: 99%

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Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Sun

Zhou

Zhang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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Refill friction stir spot welding was employed to produce 6061-T6 aluminum alloy joints with different sleeve plunge depths. The interface characteristics of joint-line remnant and hook are investigated by optical and scanning electron microscopy. The joint-line remnant consists of primary bonding region and secondary bonding region, and two types of hook can be identified as downward hook and upward hook. Tensile shear results demonstrate that joint-line remnant and hook make interaction effects on tensile shear properties. The optimal joint is achieved when sleeve plunge depth was 2.0 mm with the corresponding failure load of 8673.4 N. Three different types of fracture mode are exhibited in joints produced at different sleeve plunge depths, which are closely related with the morphology of interface characteristics.

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“…Afterwards the rotating sleeve is plunged into the workpieces, but the rotating pin is retracted. The friction of the sleeve and the welding material causes growth of the welding material temperature and the reduction of material yield stress [9][10][11]. Thereby the plasticized welded material is transferred to the pin location.…”

Section: Introductionmentioning

confidence: 99%

Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

Lacki¹,

Derlatka²,

Gałaczyński³

2017

Archives of Metallurgy and Materials

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One of the important parameters of Refill Friction Stir Spot Welding is the so-called basic position of the tool. This is the arrangement of the pin and sleeve which occurs when the tool is plunged into the material. The basic positions can be divided into two categories. In the first category, the sleeve and the pin are above the sheet surface or below sheet surface and in the second category the pin is retracted within the sleeve or protrudes from it.The aim of the work was to test four settings of the basic position, and then determine the best setting of the basic position, without changing the other welding parameters. Joints made of an aluminum alloy 2024-T3 sheet having a thickness of 1.0 mm and an aluminum alloy D16UTW sheet having a thickness of 0.6 mm were analysed. The best setting of the basic position was determined based on assessment of the force carried in shear test, macrostructure and weld face of the joints.

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Preliminary study on the mechanical behavior of friction spot welds

Abstract: The

Cited by 35 publications

References 6 publications

Mechanical performance of AA6181 refill friction spot welds under Lap shear tensile loading

Mechanical performance of AA6181 refill friction spot welds under Lap shear tensile loading

Effect of Sleeve Plunge Depth on Interface/Mechanical Characteristics in Refill Friction Stir Spot Welded Joint

Selection of basic position in Refill Friction Stir Spot Welding of 2024-T3 and D16UTW aluminum alloy sheets

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