Fatigue fracture properties of magnetic pulse welded dissimilar Al-Fe lap joints

Geng, Huihui; Sun, Lijun; Li, Guangyao; Cui, Junjia; Huang, Liang; Xu, Zhonghai

doi:10.1016/j.ijfatigue.2018.12.027

Cited by 43 publications

(12 citation statements)

References 25 publications

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“…Therefore, it could be inferred that if the discharge voltage or energy (U or Q, affecting collision energy) and the initial gap (g, affecting collision angle) are altered to appropriate values, the cavities could be eliminated or reduced due to the expelling of trapped air. The overall continuous bonding was observed in the EMPW of Al-Fe joints welded at Q = 40 kJ and g = 1.4 mm [37], Al-Ti joints made with Q = 35 kJ and g = 1.4 mm [38], and Al-Cu joint welded at U = 12 kV and g = 1.0 mm [6]. As a result, despite some extent of cavities existing in the dimple zone, continuous and superior interfacial bonding is present in layer II, thus being the primary weld zone.…”

Section: Microstructural Evolution and Formation Mechanismmentioning

confidence: 84%

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Wang

Chen

Yan

et al. 2021

Metals

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The aim of this study was to characterize detailed microstructural changes and bonding characteristics and identify the formation mechanism of collision surface of Al6061–Q355 steel dissimilar welded joints via electromagnetic pulse welding (EMPW). The collision surface was observed to consist of five zones from the center to the outside. The central non-weld zone exhibited a concave and convex morphology. The welding-affected zone mainly included melting features and porous structures, representing a porous joining. The secondary weld zone presented an obvious mechanical joining characterized by shear plateaus with stripes. The primary weld zone characterized by dimples with cavity features suggested the formation of diffusion or metallurgical bonding. The impact-affected zone denoted an invalid interfacial bonding due to discontinuous spot impact. During EMPW, the impact energy and pressure affected the changes of normal velocity and tangential velocity, and in turn, influenced the interfacial deformation behavior and bonding characteristics, including the formation of micropores which continued to grow into homogeneous or uneven porous structures via cavitation, surface tension, and depressurization, along with the effect of trapped air.

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Section: Microstructural Evolution and Formation Mechanismmentioning

confidence: 84%

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Wang

Chen

Yan

et al. 2021

Metals

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“…In the technical literature, many papers have been dedicated to explore different welding techniques for joining dissimilar materials: the most widely adopted is the friction welding [2][3][4][5][6][7][8][9], together with arc welding [10][11][12][13][14][15][16] and laser welding [17,18], but also other techniques are employed, such as resistance spot welding [19,20] and magnetic pulse welding [21]. In the context of arc welding, joining austempered ductile iron (ADI) to dissimilar structural steel allows the mechanical response of structural components to be improved, combining weight reduction and net-to-shape geometry at the same time.…”

Section: Introductionmentioning

confidence: 99%

Fatigue strength of austempered ductile iron-to-steel dissimilar arc-welded joints

et al. 2021

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Nowadays, the use of different classes of materials in the same structure is increased to keep pace with innovation and high structural performances. In this context, structural components made of different materials need to be joined together and a possible solution is given by arc welding. Dissimilar welded joints must often be able to withstand fatigue loads; however, Design Standards provide fatigue strength categories only for homogeneous welded joints. The aim of the present paper is to compare the fatigue behaviour of EN-GJS-1050 austempered ductile iron-to-S355J2 steel dissimilar joints to the categories of the corresponding homogeneous steel welded joints, as suggested in International Standards and Recommendations. For this purpose, experimental fatigue tests were performed on a selection of dissimilar welded details. First, the microstructure was identified by metallographic analysis; micro-hardness measurements were collected and residual stress profiles were obtained by using the X-ray diffraction technique on a selection of joints. Misalignments were quantified for all specimens. Then, experimental fatigue tests have been performed on a number of joint geometries subject to axial or bending fatigue loadings and tested in the as-welded conditions. The fracture surfaces of the joints have been analysed to locate fatigue crack nucleation sites.

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“…These inherent features make EMCE particularly suitable for thin fasteners with holes. It has been proved that the effect of electromagnetic process could be influenced by the parameters of the circuits [16][17][18][19][20][21]. However, few studies have been reported about the influenced of circuits on the PDZ of thin specimens via EMCE process.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the effects of circuit parameters on the plastic deformation of fastener holes in thin aluminum alloy via electromagnetic expansion process

Geng

Cao

et al. 2021

Int J Adv Manuf Technol

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The size of plastic deformation zone during fastener hole strengthening is a critical indicator of the strengthening effect. In this study, a considerable plastic deformation zone in 1.5 mm aluminum alloy plate with a hole was produced via electromagnetic strengthening. The finite element analysis results showed that the electromagnetic strengthening process could achieve high compressive hoop residual stress around the fastener hole in thin plate without serious axial deformation compared with conventional cold hole expansion process. The simulation results were experimentally validated by the grid method. Furthermore, for the same discharge energy, the size of plastic deformation zone varies with the discharge capacitance, and there was an optimal combination of the discharge capacitance and discharge voltage.What's more, even the plastic deformation zone was the same at the maxed load, different unloading process during the electromagnetic hole expansion process also had a great influence on the strengthening effect.

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Fatigue fracture properties of magnetic pulse welded dissimilar Al-Fe lap joints

Cited by 43 publications

References 25 publications

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Hierarchical Morphology and Formation Mechanism of Collision Surface of Al/Steel Dissimilar Lap Joints via Electromagnetic Pulse Welding

Fatigue strength of austempered ductile iron-to-steel dissimilar arc-welded joints

Numerical investigation on the effects of circuit parameters on the plastic deformation of fastener holes in thin aluminum alloy via electromagnetic expansion process

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