Improving interfacial reaction nonhomogeneity during laser welding–brazing aluminum to titanium

Chen, Shuhai; Li, Liqun; Chen, Yanbin; Dai, Jingmin; Huang, Jihua

doi:10.1016/j.matdes.2011.03.074

Cited by 130 publications

(59 citation statements)

References 26 publications

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“…These assemblies can be found by adopting welding processes (Katayama, 2009a). The quality of welded dissimilar joints depends upon the cracking tendency, surface morphology, hardness, mixing of liquid phases and metallurgical non-homogeneity induced by gradients of temperature and cooling rate at the weld interface (Squillace et al, 2012;Chen et al, 2011b). Dissimilar welding of Ti and Al using laser beam with extremely high welding speed was tried and the microstructural characteristics of the interface zone in the Ti and Al weld were investigated (Lee et al, 2013;Squillace et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Kalaiselvan¹,

Elango²,

Nagarajan³

2017

IJASMM

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Laser beam welding produces good quality welds with minimum shrinkage for sheet metal joints. The quality of welded joint depends upon surface morphology, hardness, mixing of liquid phases and metallurgical non-homogeneity induced by gradients of temperatures and cooling rate at the weld interface. In the present investigation, Titanium Grade5 (Ti) and AA2024 (Al) alloy dissimilar sheet metals are joined using Nd:YAG pulsed laser beam and the effect of welding speed on crack tendencies, the strength of weldment based on hardness and composition changes are studied. Test results reveal that higher welding speed eliminates cracks in weldment and improves surface morphology. From hardness test, it is observed that the strength of fusion zone is considerably improved at higher weld speed and the findings are supported by SEM and EDS studies.Keywords: laser beam welding; LBW; morphology; hardness; microstructure; composition.Reference to this paper should be made as follows: Kalaiselvan, K., Elango, A. and Nagarajan, N.M. (2017) N.M. Nagarajan is a retired Professor from National Institute of Technology, Calicut, Kerala, India. His current research deals with powder metallurgy, metal joining, foundry and control of welding processes. He has authored and co-authored more than 100 technical papers.

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Section: Introductionmentioning

confidence: 99%

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Kalaiselvan¹,

Elango²,

Nagarajan³

2017

IJASMM

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“…Given others' findings [8,10] and our previous work [11,12] reporting that Al-Si alloy filler wires were effective in improving interface morphologies and obtaining good interfacial metallurgical bonding, two groups of Al-Si alloys including ER4043 (AlSi5) and ER4047 (AlSi12) were selected as filler wires to explore the effect of Si content on interfacial reaction mechanism. Chemical compositions of candidate materials and physical properties of base metals are presented in Table 1 and Table 2, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Some conventional fusion welding methods are not suitable for joining Ti/Al. Chen et al [10] pointed out that the temperature gradient along the interface influenced interfacial reaction and adopted rectangular spot laser beam to *Corresponding author: tel. : +86 13583136059; e-mail address: yajli@sdu.edu.cn improve homogenization of Ti/Al interfacial reaction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Si on Ti/Al brittle interfacial phases and microstructural evolution of pulsed current gas tungsten arc welding joints

Liu¹,

Li²,

Wang³

et al. 2016

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The effect of Si on brittle interfacial phases and microstructural evolution of Ti/Al joints was investigated during pulsed current gas tungsten arc welding (PCGTAW) with filler wires. Interfacial microstructure and phase constituents were characterized by an optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The microstructural evolution mechanism was revealed from the perspective of the thermodynamics. It was found that the layered microstructure consisted of various Ti-Al or Ti-Si intermetallic compounds (IMCs). The effect of silicon on the reaction mechanism of fusion-welding interface mainly included that the formation of Ti5Si3 consumed most molten titanium and suppressed the reaction of titanium with aluminum. Moreover, the Ti5Si3 distributing at the grain boundary contributed to the forming of discontinuous TiAl3. The effect of silicon on the reaction mechanism of brazed interface was mainly reflected by silicon in the reaction of titanium with aluminum and the forming of Ti(AlxSi1−x)3. K e y w o r d s : effect of Si, interface, microstructural evolution, welding, Ti/Al

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“…Chen et al have also considered the process of welding-brazing with lasers [8] and they have focused on the improvement of the interfacial layer [9].…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

Dal

Peyre

2017

Metals

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Abstract:The control of metal wettability is a key-factor in the field of brazing or welding-brazing. The present paper deals with the numerical simulation of the whole phenomena occurring during the assembly of dissimilar alloys. The study is realized in the frame of potential applications for the aircraft industry, considering the case of the welding-brazing of aluminum Al5754 and quasi-pure titanium Ti40. The assembly configuration, presented here, is a simplification of the real experiment. We have reduced the three-dimensional overlap configuration to a bi-dimensional case. In the present case, an aluminum cylinder is fused onto a titanium substrate. The main physical phenomena which are considered here are: the heat transfers, the fluid flows with free boundaries and the mass transfer in terms of chemical species diffusion. The numerical problem is implemented with the commercial software Comsol Multiphysics™, by coupling heat equation, Navier-Stokes and continuity equations and the free boundary motion. The latter is treated with the Arbitrary Lagrangian Eulerian method, with a particular focus on the contact angle implementation. The comparison between numerical and experimental results shows a very satisfactory agreement in terms of droplet shape, thermal field and intermetallic layer thickness. The model validates our numerical approach.

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Improving interfacial reaction nonhomogeneity during laser welding–brazing aluminum to titanium

Cited by 130 publications

References 26 publications

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Weld speed effects on quality of Ti/Al dissimilar metal joints using laser beam welding

Effect of Si on Ti/Al brittle interfacial phases and microstructural evolution of pulsed current gas tungsten arc welding joints

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

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