Microstructures and Mechanical Properties of Laser Penetration Welding Joint With/Without Ni-Foil in an Overlap Steel-on-Aluminum Configuration

Chen, Shuhai; Huang, Jihua; Ma, Ke; Zhao, Xingke; Vivek, Anupam

doi:10.1007/s11661-014-2241-1

Cited by 57 publications

(26 citation statements)

References 24 publications

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“…As the formation of the IMC layers is mainly controlled by the temperature and the time [15], the welding process should have simultaneously low heat input and high cooling rate [13] for successfully joining of the steel/Al joints. In this respect, laser welding offers some distinct advantages over the convention arc welding, such as high energy density, controllable heat input, accurate laser beam location, small heat-affected zones, high welding speed, to meet the increasing demands for high performance of welding of steel/Al joints [16,17]. During laser welding of steel/Al joints, three welding processes are reported involving reactive wetting, welding-brazing and keyhole welding [18].…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Hence, a titanium-on-aluminum overlap configuration can be used because upper titanium absorbs aluminum as solid solution elements floated up from under melting Al pool. This method has been used in a steel-on-aluminum overlap configuration, which suppressed the formation of IMCs by controlling steel penetration in aluminum [20][21][22][23][24]. S. Lee et al [25,26] tried a dissimilar welding of Ti and Al using single-mode fiber laser with extremely high welding speed (5-50 m/min) and investigated the microstructural characteristics of the interface zone in Ti and Al weld.…”

Section: Introductionmentioning

confidence: 99%

Laser penetration welding of an overlap titanium-on-aluminum configuration

Chen

Yang

et al. 2016

Int J Adv Manuf Technol

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An overlap titanium-on-aluminum configuration based on laser penetration welding was designed to suppress the formation of intermetallic compounds. Weld surface appearance, weldgeometry, microstructure, and mechanical property of the joint were investigated. The collaps of upper liquid titanium closes keyhole filled with boiling aluminum vapor, which induces welding spatter. Optimizing processing parameters could control the welding spatter to some extent. Weld geometry is characterized by depth of the weld loss, depth of the penetration of titanium into aluminum and width of joining, which depends on processing parameters strongly. The overlap titanium-on-aluminum configuration can suppress the formation of intermetallic compounds inside Ti weld. Interfacial reaction appears between Ti weld and Al, and the reaction layers are composed of TiAl and TiAl 3 . The banded structures with Ti 3 Al were found inside Ti weld. Tensile capacity of the joint increases firstly and then decreases with increasing laser power or decreasing welding speed, depending on weld geometry and interfacial reaction. Moreover, there are two broken modes of the joints, which are fractured in interface and in Ti weld, respectively. When joints fracture in the Ti weld, the joint has the higher tensile property, up to 184 N/mm.

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“…The joint strength is presented in N/mm (failure load divided by tensile specimen width) as the geometry of the tensile specimens was not identical due to different FZ geometries developed in laser welding/brazing under different process conditions and the complex stresses involved in such situations. [27] Nanohardness of the IMC was evaluated using a Hysitron TriboIndenter with a constant force of 4 mN. After welding, specimens were cut from the laser joints and mounted in phenolic resin.…”

Section: Methodsmentioning

confidence: 99%

Dissimilar Laser Welding/Brazing of 5754 Aluminum Alloy to DP 980 Steel: Mechanical Properties and Interfacial Microstructure

Yang

Zhang

et al. 2015

Metall Mater Trans A

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A diode laser welding/brazing technique was used for lap joining of 5754 aluminum alloy to DP 980 steel with Al-Si filler metal. The correlation between joint interfacial microstructure, wettability of filler metal, and mechanical properties was systematically investigated. At low laser power (1.4 kW), a layer of intermetallic compounds, composed of h-Fe(Al,Si) 3 and s 5 -Al 7.2 Fe 1.8 Si, was observed at the interface between fusion zone and steel. Because of the poor wettability of filler metal on the steel substrate, the joint strength was very low and the joint failed at the FZ/steel interface. When medium laser power (2.0 kW) was applied, the wettability of filler metal was enhanced, which improved the joint strength and led to FZ failure. With further increase of laser power to 2.6 kW, apart from h and s 5 , a new hard and brittle gFe 2 (Al,Si) 5 IMC with microcracks was generated at the FZ/steel interface. The formation of g significantly degraded the joint strength. The failure mode changed back to interfacial failure.

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Microstructures and Mechanical Properties of Laser Penetration Welding Joint With/Without Ni-Foil in an Overlap Steel-on-Aluminum Configuration

Cited by 57 publications

References 24 publications

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

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

Laser penetration welding of an overlap titanium-on-aluminum configuration

Dissimilar Laser Welding/Brazing of 5754 Aluminum Alloy to DP 980 Steel: Mechanical Properties and Interfacial Microstructure

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