Effect of Si content on the interfacial reactions in laser welded-brazed Al/steel dissimilar butted joint

Xia, Hongbo; Zhao, Xu; Tan, Caiwang; Chen, Bin; Song, Xiaoguo; Li, Liqun

doi:10.1016/j.jmatprotec.2018.03.010

Cited by 87 publications

(29 citation statements)

References 28 publications

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“…In this case, the joint is obtained by fusion welding on the aluminum side, and by the reaction between the liquid filler alloy and the solid steel surface, on the steel side. Both lap welding and butt welding are possible; the former was investigated by Sierra et al [47] and Mathieu et al [48,49], the latter by Sun et al [50], Zhang et al [51], and Li, Xia, Tan et al [52][53][54][55][56].…”

Section: Laser Beam Weldingmentioning

confidence: 99%

Review of Aluminum-To-Steel Welding Technologies for Car-Body Applications

Gullino

Matteis

D’Aiuto

2019

Metals

137

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Hybrid car bodies fabricated by joining parts made with steel and aluminum alloys are becoming increasingly common. This provides an affordable mean to decrease the car weight by using lighter or more advanced materials only where they can achieve the maximum benefit. This development is driven mainly by recent regulations on carbon dioxide emissions, and hinges on the deployment of effective joining technologies. In most cases, such technologies were not previously used in the car sector, and must be adapted to its requirements. Several dissimilar welding technologies, based on either fusion welding or solid-state welding, are reviewed here, focusing on dissimilar joining among steels and wrought aluminum alloys. These technologies are either presently being introduced in the car industry, or are used in other sectors and could be applied in the car industry in the near future.

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Section: Laser Beam Weldingmentioning

confidence: 99%

Review of Aluminum-To-Steel Welding Technologies for Car-Body Applications

Gullino

Matteis

D’Aiuto

2019

Metals

137

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“…In addition, a long crack along the lath-like layers and cross the needle-like phases is clearly observed. Therefore, the upper part primarily displays irregular island-shape structures and thicker lath-like layers, whereas the lower Zones have fine needle-like phases, thinner lath-like layers directly influenced by the relatively small heat input as a result of the far distance from the steel/Al interface [39]. The variation in the morphology and thickness with the different locations at the Al/weld interface microstructure can be finally attributed to the temperature gradients and cooling rates.…”

Section: Morphology and Thicknessmentioning

confidence: 99%

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Cui

Chen

et al. 2018

Metals

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Welding of dissimilar steel/Al lapped joints of 1.5 mm in thickness was carried out by using dual-beam laser welding with side-by-side configuration. The effect of the major process parameters including the dual-beam power ratio of (Rs) and dual-beam distance (d1) on the steel/Al joint characteristics was investigated concerning the weld shape, interface microstructures, tensile resistance and fracture behavior. The results show that dual-beam laser welding with side-by-side configuration produces soundly welded steel/Al lapped joints free of welding defects. The processing parameters of Rs and d1 have a great influence on the weld appearance, the weld penetration in the Al alloy side (P2) and the welding defects. Variation in the depth of the P2 and the locations at the Al/weld interface cause heterogeneous microstructures in the morphology and the thickness of the intermetallic compound (IMC) layers. In addition, electron back scattered diffraction (EBSD) phase mapping reveals that the IMC layer microstructures formed at the Al/weld interface include the needle-like θ-Fe4Al13 phases and compact lath η-Fe2Al5 layers. Some very fine θ-Fe4Al13 and η-Fe2Al5 phases generated along the weld grain boundaries of the steel/Al joints are also confirmed. Finally, there is a matching relationship between the P2 and the tensile resistance of steel/Al joints, and the maximum tensile resistance of 109.2 N/mm is obtained by the steel/Al joints produced at the Rs of 1.50 during dual-beam laser welding with side-by-side configuration. Two fracture path modes have taken place depending on the P2, and relatively high resistance has been achieved for the steel/Al joints with an optimum P2.

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“…In this study, 1.5-mm thick 5754 aluminum alloy and DP980 steel sheets were used as the base materials. Their chemical compositions and mechanical properties are given in Tables 1 and 2 Base materials were machined as rectangular strips of 50 × 60 mm 2 . The aluminum alloy sheets went through a very strict two-step cleaning process, which was shown in our previous study [19].…”

Section: Methodsmentioning

confidence: 99%

“…Aluminum alloys can reduce the weight of structural parts due to its light weight, and steel has a high strength. Hybrid structures of aluminum alloy and steel are suggested in automotive applications to improve the fuel efficiency and control air pollution through reducing the weight [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Diode Laser Welding/Brazing of Aluminum Alloy to Steel Using a Nickel Coating

et al. 2018

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Joining Al alloy to steel is of great interest for application in the automotive industry. Although a vast number of studies have been conducted to join Al to steel, the joining of Al to steel is still challenging due to the formation of brittle Fe-Al intermetallic compounds. In this work, the microstructure and mechanical properties of the dissimilar Al/steel joints with and without a nickel coating are comparatively investigated. A homogenous reaction layer composed of FeZn 10 and Fe 2 Al 5 is formed at the interface in the joints without Ni coating, and the joint facture load is only 743 N. To prevent the formation of brittle Fe 2 Al 5 , Ni electroplated coating is applied onto a steel surface. It has been shown that a nonhomogeneous reaction layer is observed at the interfacial region: Ni 5 Zn 21 is formed at the direct irradiation zone, while Al 3 Ni is formed at the fusion zone root. The microhardness of the interfacial layer is reduced, which leads to the improvement of the joint mechanical properties. The average fracture load of the Al/Ni-coated steel joints reaches 930 N. In all of the cases, failure occurs at the Ni coating/fusion zone interface.

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Effect of Si content on the interfacial reactions in laser welded-brazed Al/steel dissimilar butted joint

Cited by 87 publications

References 28 publications

Review of Aluminum-To-Steel Welding Technologies for Car-Body Applications

Review of Aluminum-To-Steel Welding Technologies for Car-Body Applications

Welding of Dissimilar Steel/Al Joints Using Dual-Beam Lasers with Side-by-Side Configuration

Diode Laser Welding/Brazing of Aluminum Alloy to Steel Using a Nickel Coating

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