Investigation on TIG arc welding–brazing of Ti/Al dissimilar alloys with Al based fillers

Lv, Shixiong; Jing, Xing; Huang, Yongxian; Xu, Yanjin; Zheng, Chao; Yang, Shiqin

doi:10.1179/1362171812y.0000000041

Cited by 36 publications

(22 citation statements)

References 22 publications

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“…Subsequently, dissolved Ti atoms react with Al atoms to form TiAl 2 along a liquid/solid interface. The formation of TiAl 3 is suppressed, which would be attributed to fast cooling rate of hybrid welding since the welding speed used in this paper (2.5 m·min −1 ) is even faster than that of the usual single arc and laser welding (<0.3 m·min −1 ) [ 15 , 16 ].…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Tensile Behavior of Laser Arc Hybrid Welded Dissimilar Al and Ti Alloys

Gao

Chen

et al. 2014

Materials

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Fiber laser-cold metal transfer arc hybrid welding was developed to welding-braze dissimilar Al and Ti alloys in butt configuration. Microstructure, interface properties, tensile behavior, and their relationships were investigated in detail. The results show the cross-weld tensile strength of the joints is up to 213 MPa, 95.5% of same Al weld. The optimal range of heat input for accepted joints was obtained as 83–98 J·mm−1. Within this range, the joint is stronger than 200 MPa and fractures in weld metal, or else, it becomes weaker and fractures at the intermetallic compounds (IMCs) layer. The IMCs layer of an accepted joint is usually thin and continuous, which is about 1μm-thick and only consists of TiAl2 due to fast solidification rate. However, the IMCs layer at the top corner of fusion zone/Ti substrate is easily thickened with increasing heat input. This thickened IMCs layer consists of a wide TiAl3 layer close to FZ and a thin TiAl2 layer close to Ti substrate. Furthermore, both bead shape formation and interface growth were discussed by laser-arc interaction and melt flow. Tensile behavior was summarized by interface properties.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Tensile Behavior of Laser Arc Hybrid Welded Dissimilar Al and Ti Alloys

Gao

Chen

et al. 2014

Materials

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“…Titanium is difficult to fusion weld to a nickel base alloy because it forms brittle intermetallic compounds with almost every element contained in such alloys (Ni, Fe, Cr, Mn, and Si). However, the use of buttering (columbium or copper alloy) and better control of welding parameters can improve mechanical properties of the joint (Gorin 1964;Lv et al 2012).…”

Section: Difficulties In Dissimilar Non-ferrous Metal Weldingmentioning

confidence: 99%

Welding of dissimilar non-ferrous metals by GMAW processes

Mvola

Kah

Martikainen

2014

Int J Mech Mater Eng

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For many years, the manufacturing industry has shown interest in the opportunities offered by welding of dissimilar metals. The need for appropriate and effective techniques has increased in recent decades because of efforts to build light and strong vehicles with reduced fuel consumption. In addition, the thermal conductivity, corrosion resistance, and recyclability are other reasons to weld dissimilar non-ferrous metal. Early gas metal arc welding (GMAW) processes had limited control of the heat input, a prerequisite for effective welding of dissimilar metals, but the advanced GMAW processes of the past decades offer new perspectives. The objective of this paper is to review the main principles of the fusion welding of dissimilar metals. The study briefly investigates the challenges in welding the main possible combination of categories of non-ferrous metal. Some experiments performed on dissimilar metals using GMAW processes are then reviewed, highlighting those made using advanced GMAW processes. The study collates data from the scientific literature on fusion dissimilar metal welding (DMW), advanced GMAW processes, and experiments conducted with conventional GMAW. The study shows that the welding procedure specification is a crucial factor in DMW. Advanced GMAW processes have significant potential in the fusion welding of dissimilar non-ferrous metals of different grades. Accurate control of the heat input allows more effective prediction of the intermetallic properties and better control of post-heat treatments. Increased understanding of advanced GMAW processes will permit the development of more accurate specifications of welding procedures for DMW. Process flexibility and adaptability to robotic mass production will allow a wider range of applications and the avoidance of costly alternative methods.

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“…It was demonstrated that in aluminum-titanium dissimilar weld, porosity tended to be produced in the fusion line. It happens that gases in the seam are hard to escape and concentrated in the middle of fusion line during the solidification process [21]. In Figure 6, some gas trapping occurred on both sides of the intermetallic layer but not in the intermetallic layer.…”

Section: Metallurgical Characterization Of Weldmentioning

confidence: 99%

FEM Simulation of Dissimilar Aluminum Titanium Fiber Laser Welding Using 2D and 3D Gaussian Heat Sources

D’Ostuni

Leo

Casalino

2017

Metals

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For a dissimilar laser weld, the model of the heat source is a paramount boundary condition for the prediction of the thermal phenomena, which occur during the welding cycle. In this paper, both two-dimensional (2D) and three-dimensional (3D) Gaussian heat sources were studied for the thermal analysis of the fiber laser welding of titanium and aluminum dissimilar butt joint. The models were calibrated comparing the fusion zone of the experiment with that of the numerical model. The actual temperature during the welding cycle was registered by a thermocouple and used for validation of the numerical model. When it came to calculate the fusion zone dimensions in the transversal section, the 2D heat source showed more accurate results. The 3D heat source provided better results for the simulated weld pool and cooling rate.

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Investigation on TIG arc welding–brazing of Ti/Al dissimilar alloys with Al based fillers

Cited by 36 publications

References 22 publications

Microstructure and Tensile Behavior of Laser Arc Hybrid Welded Dissimilar Al and Ti Alloys

Microstructure and Tensile Behavior of Laser Arc Hybrid Welded Dissimilar Al and Ti Alloys

Welding of dissimilar non-ferrous metals by GMAW processes

FEM Simulation of Dissimilar Aluminum Titanium Fiber Laser Welding Using 2D and 3D Gaussian Heat Sources

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