Fracture mechanism of refill friction stir spot-welded 2024-T4 aluminum alloy

Li, Zhengwei; Ji, Shude; Ma, Yinan; Chai, Peng; Yue, Yumei; Gao, Shan

doi:10.1007/s00170-015-8276-7

Cited by 68 publications

(28 citation statements)

References 20 publications

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“…The incomplete refilling defect is located on the surface of the upper sheet ( Fig. 10) and is attributed to insufficient flow of the stirred material at the refilling stage [18]. A convergence may be noticed between the results of FEM and those of the experiment.…”

Section: Characterisation Of the Weld Zonementioning

confidence: 64%

“…In the last decade, RFSSW technology has shown great potential for use in the joining of aluminium alloys used in the construction of aircraft structures [17,18]. The aim of most research was to determine the optimal welding parameters which allow one to reach the maximum load capacity of the joint in connection with the minimisation of possible weld defects.…”

Section: Introductionmentioning

confidence: 99%

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A fully coupled thermo-mechanical numerical modelling of the refill friction stir spot welding process in Alclad 7075-T6 aluminium alloy sheets

Kubit

Trzepieciński

2020

Archiv.Civ.Mech.Eng

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Refill friction stir spot welding (RFSSW) is a solid state joining technology that has the potential to replace processes such as the open-air fusion bonding technique and rivet technology in aerospace applications. Selection of proper RFSSW parameters is a crucial task which is important to ensure the mechanical strength of the joint. The aim of this paper is to undertake numerical modelling of the RFSSW process to understand the physics of the welding process, which involves large deformations, complex contact conditions and steep temperature gradients. Three-dimensional fully coupled thermo-mechanical models of RFSSW joints between Alclad 7075-T6 aluminium alloy sheets have been built in the finite-element-based program Simufact Forming. The simulation results included the temperature distribution and the stress and strain distributions in the overlap joint. The results of numerical computations have been compared with experimental ones. The numerical model was able to predict the mechanics of material flow during the joining of sheets of Alclad aluminium alloys using RFSSW. The predictions of the temperature gradient in the weld zone were in good agreement with the temperature measured experimentally. The numerical models that have been built are capable of simulating RFSSW to reduce the number of experiments required to set optimal welding parameters.

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Section: Characterisation Of the Weld Zonementioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

A fully coupled thermo-mechanical numerical modelling of the refill friction stir spot welding process in Alclad 7075-T6 aluminium alloy sheets

Kubit

Trzepieciński

2020

Archiv.Civ.Mech.Eng

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“…Meanwhile, the crack propagates around SZ in upper sheet under compressive stress. Finally, the crack occurs along the orientation of maximum shear stress [32]. As Cao et al [22] depicted, the results could be explained by the inhomogeneous plastic deformation in the weld leading to strong texture gradients at the SZ/TMAZ interface region.…”

Section: Fracture Behaviormentioning

confidence: 93%

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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“…Step-Down Transformer is defined as the "A Transformer which decreases the voltage from primary winding to the secondary winding and also increase the current at the output" is called Step-Down Transformer [16][17].…”

Section: Transformermentioning

confidence: 99%

Design and Fabrication of Portable spot-welding machine for sheet metal operation

2021

IJETER

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Spot welding machine requires a lot of power, occupies large area and it is heavy to transport, restricted by height and does not weld all angle. On present work, we have tried to overcome the above problems by restructuring the design. Newly designed apparatus was simpler, lighter, portable, compact and flexible machine which will be able to weld at any angle and can be easily operated by even a non-skilled Labor with much ease and required accuracy. The first thing is the fabrication of the portable spot-welding machine which is divided into two phases, first is the formation of basic circuit of machine which includes small transformer of 1.2 kVA with output voltage 0 to 2.2 volt with 2.5-gauge wire & power switch and second is the formation of body and arm mechanism of the machine. For creating this machine, we used modelling software such as Autodesk Fusion 360 and created a prototype based on its design. In this project we made our own transformer according to requirements of specifications for welding as a general transformer used in electronic appliances was costly and as well a Bulky.

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Fracture mechanism of refill friction stir spot-welded 2024-T4 aluminum alloy

Cited by 68 publications

References 20 publications

A fully coupled thermo-mechanical numerical modelling of the refill friction stir spot welding process in Alclad 7075-T6 aluminium alloy sheets

A fully coupled thermo-mechanical numerical modelling of the refill friction stir spot welding process in Alclad 7075-T6 aluminium alloy sheets

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

Design and Fabrication of Portable spot-welding machine for sheet metal operation

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