Research on microstructure and mechanical properties of laser keyhole welding–brazing of automotive galvanized steel to aluminum alloy

Zhang, M.J.; Chen, G.Y.; Zhang, Y.; Wu, Kanglong

doi:10.1016/j.matdes.2012.09.023

Cited by 90 publications

(29 citation statements)

References 19 publications

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“…The colors in phase mapping is based on a color-coded legend, in which the red, yellow, blue and green correspond to the α-Fe, α-Al, Fe 2 Al 5 , and Fe 4 Al 13 phases, respectively. As shown in Table 2, the Fe 4 Al 13 phase had a monoclinic unit cell with a = 15.49 Å, b = 8.08 Å, c = 12.48 Å, and β = 107.72 • , and the Fe 2 Al 5 phase had an orthorhombic crystal with lattice constants of a = 7.66 Å, b = 6.42 Å, c = 4.22 Å, and β = 90 • , which is consistent with that of the previous studies [25,37]. Note that the Fe 4 Al 13 phase here was the same as the equilibrium FeAl 3 phase identified by preliminary EDS analysis.…”

Section: Microstructures Of Al/steel Jointsupporting

confidence: 90%

“…This indicates that the laser keyhole welding process was mainly used to lapped or overlapped joints [12,13,15,[22][23][24]. It can be, but rarely is, used for welding Al/steel butt joints requiring accurate groove preparations, flux and filler wires [24][25][26][27]. Although the use of filler wires or flux leads to some improvement in the joint properties, laser welding with filler materials has usually been considered too difficult for industrial applications because there are too many parameters and the requirements for wire positioning are too stringent [28], thereby reducing efficiency and productivity.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and Mechanical Properties of Dissimilar Al/Steel Butt Joints Produced by Autogenous Laser Keyhole Welding

Cui

Chen

Qian

et al. 2017

Metals

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Dissimilar Al/steel butt joints of 6.0 mm thick plates have been achieved using fiber laser keyhole welding autogenously. The cross sections, interface microstructures, hardness and tensile properties of Al/steel butt joints obtained under different travel speeds and laser beam offsets were investigated. The phase morphology and thickness of the intermetallic compound (IMC) layers at the interface were analyzed by scanning electronic microscopes (SEM) using the energy-dispersive spectrometry (EDS) and electron back-scattered diffraction (EBSD) techniques. The results show that travel speeds and laser beam offsets are of considerable importance for the weld shape, morphology and thickness of IMC layers, and ultimate tensile strength (UTS) of Al/steel butt joints. This proves that the IMC layers consist of Fe 2 Al 5 phases and Fe 4 Al 13 phases by EBSD phase mapping. Increasing laser beam offsets from 0.3 mm to 0.7 mm significantly decreases the quantity of Fe 4 Al 13 phases and the thickness of Fe 2 Al 5 layers at the interface. During tensile processing, the Fe 2 Al 5 layer with the weakest bonding strength is the most brittle region at the interface. However, an intergranular fracture that occurred at Fe 2 Al 5 layers leads to a relatively high UTS of Al/steel butt joints.

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Section: Microstructures Of Al/steel Jointsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Microstructures and Mechanical Properties of Dissimilar Al/Steel Butt Joints Produced by Autogenous Laser Keyhole Welding

Cui

Chen

Qian

et al. 2017

Metals

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“…Autogenous ''braze welding'' [4,5], laser pressure welding [6][7][8][9] in which pressure was simultaneously applied with laser irradiation, and filler-metal-added braze welding [10][11][12][13][14][15][16] have been considered. In these studies, only the Al alloy was melted, while the steel remained unmelted.…”

Section: Introductionmentioning

confidence: 99%

Joining Al 5052 alloy to aluminized steel sheet using cold metal transfer process

Kang

Kim

2015

Materials & Design

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“…In another study [12], the researchers showed that the interaction of solid steel with molten aluminum through conduction welding can result in joints with promising mechanical properties. Likewise, the results of another research showed that the mechanical properties preservation can be obtained by limiting the intermetallic layer thickness below 10 [19]. Contrary, Sonia meco et al reported that there is no optimum thickness for the intermetallics, as the favorable effect of increasing in wetting and bonding area can compensate for the detrimental effects of thicker intermetallics [20].…”

Section: Introductionmentioning

confidence: 99%

Employment of fiber laser technology to weld austenitic stainless steel 304 l with aluminum alloy 5083 using pre-placed activating flux

et al. 2015

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Fadzil, Employment of fiber laser technology to weld Austenitic stainless steel 304 L with Aluminum alloy 5083 using pre-placed activating flux, (2015), AbstractThe overlapping welding was carried out in keyhole mode between austenitic stainless steel 304 L and aluminum alloy 5083 using a low power fiber laser in continuous irradiation. The significant content of magnesium as the alloying element with low boiling point and high vapor pressure inside the AA 5083 matrix can induce the spatter formation and depression on surface of the weld beads upon laser beam absorption and temperature growth which can deteriorate the mechanical properties and appearance of the joints. To reduce these defects, a variety of single and multi-components activating fluxes including oxide-based TiO 2 and halide-based CaF 2 flux powders were pre-placed on the surface of welding material prior to laser welding. The EDX and XRD analyses in addition to microhardness and shear tests were carried out to characterize the joints. The obtained results showed that, the oxide and halide activating fluxes can significantly improve the joints' strength up to 1.48 and 1.85 times in average respectively compared with autogenous joint. It was deduced that the simultaneous effect of significant decrease in joints' surface depression leading to welds' geometry improvement in addition to less formation of interfacial Fe-Al intermetallics, were the major causes for considerable strength improvements.

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Research on microstructure and mechanical properties of laser keyhole welding–brazing of automotive galvanized steel to aluminum alloy

Cited by 90 publications

References 19 publications

Microstructures and Mechanical Properties of Dissimilar Al/Steel Butt Joints Produced by Autogenous Laser Keyhole Welding

Microstructures and Mechanical Properties of Dissimilar Al/Steel Butt Joints Produced by Autogenous Laser Keyhole Welding

Joining Al 5052 alloy to aluminized steel sheet using cold metal transfer process

Employment of fiber laser technology to weld austenitic stainless steel 304 l with aluminum alloy 5083 using pre-placed activating flux

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