Influence of Si content on interfacial reactions and mechanical properties of dual-spot laser welded-brazed Ti/Al joints

Li, Peng; Lei, Zhenglong; Zhang, Xinrui; Chen, Yanbin

doi:10.1016/j.jmapro.2020.06.001

Cited by 43 publications

(7 citation statements)

References 34 publications

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“…Since the temperature profile increases during the FSVB process (figure 5), the thickness of the intermetallic components (IMCs) decreases as reinforcing particles are added to the filler metal and consequently, the interfacial bonding improves. This result proves the outcomes reported by Li et al [35]. They reported that the performance of the brazed joint has been developed as Si content in filer metal is equal to 5%wt or higher during the dual-spot laser welded-brazed joint.…”

Section: Effect Of Second Phase Particlessupporting

confidence: 90%

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

2021

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In the current investigation, a new version of brazing entitled FSVB (friction stir vibration brazing) is developed. In this process, the adjoining samples are vibrated normally to the brazing line while FSB is performed. Low carbon steel sheets are lap joined together using FSB and FSVB methods while SiO2 nanoparticles are incorporated in the joint. The microstructure and mechanical behaviors of the joints developed under different conditions are analyzed. %67wt Sn-%33wt Pb alloy is used as braze metal. The results show that the strength of the FSV brazed specimen is higher than that of the FS brazed sample (about 30%); additionally, the presence of SiO2 nanoparticles increases the strength of joints made by FSVB. Second-phase particles reduce the mobility of dislocations and strengthen the braze material. The vibration of adjoining specimens, during FSVB, increases the stirring of the molten braze metal between the adjoining specimens and the molten fills the space thoroughly. Workpiece vibration during FSVB also leads to the production of higher heat and temperature compared to those when using FSB. The higher temperature results in a higher fluidity of molten and it enhances the homogeneity of second-phase particle distribution and as a result, the joint strength increases. The results show that the strength and hardness of FSV brazed samples increase by 16% and 18%, respectively, and the thickness of the intermetallic component decreases as vibration frequency increases from 20 Hz to 50 Hz.

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Section: Effect Of Second Phase Particlessupporting

confidence: 90%

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

2021

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“…Filler wire with 12 wt.% Si provided a thinner IMC layer with better strength and ductility, which is possibly linked to the more favourable morphology of columnar IMC crystals consisting of complex τ 2 -phase (Al 21 Si 46 Ti 33 -Al 8 Si 59 Ti 33 ) and TiAl 3 , due to higher Si content. Similar results were obtained by Li et al [50]. The effect of the Si content on the wire is illustrated in Figure 26, where an increase in Si causes a reduction in the IMC layer thickness, providing improved mechanical properties.…”

Section: Formation and Growth Of Ti-al Imc Layersupporting

confidence: 85%

A Review on Laser-Assisted Joining of Aluminium Alloys to Other Metals

Bunaziv

Akselsen

Ren

et al. 2021

Metals

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Modern industry requires different advanced metallic alloys with specific properties since conventional steels cannot cover all requirements. Aluminium alloys are becoming more popular, due to their low weight, high corrosion resistance, and relatively high strength. They possess respectable electrical conductivity, and their application extends to the energy sector. There is a high demand in joining aluminium alloys with other metals, such as steels, copper, and titanium. The joining of two or more metals is challenging, due to formation of the intermetallic compound (IMC) layer with excessive brittleness. High differences in the thermophysical properties cause distortions, cracking, improper dilution, and numerous weld imperfections, having an adverse effect on strength. Laser beam as a high concentration energy source is an alternative welding method for highly conductive metals, with significant improvement in productivity, compared to conventional joining processes. It may provide lower heat input and reduce the thickness of the IMC layer. The laser beam can be combined with arc-forming hybrid processes for wider control over thermal cycle. Apart from the IMC layer thickness, there are many other factors that have a strong effect on the weld integrity; their optimisation and innovation is a key to successfully delivering high-quality joints.

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“…7b. It demonstrated that a lamellar IMC layer with a thickness of 0.55 to 0.59 µm, the brazing performance of confirmation experiment results are similar to the Ti/Al butt-joint that performed by Wan et al [2] and Li et al [21]. In summary, this validates that the Ti/Al lap-joint produced by the MIG arc weld-brazing process and proposed approach would obtain a desirable mechanical property and wettability of the Ti/Al lap-joint specimens simultaneously.…”

Section: Confirmation and Validation Of Optimal Parameterssupporting

confidence: 74%

Optimization of the MIG Arc Weld-Brazing Process on Titanium and Aluminum Lap-Joint Welds Using the Taguchi Method, Grey Relational Analysis and Fuzzy Logic

Lin

Wang

2021

Preprint

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The dissimilar materials lap-joint of Ti-6Al-4V titanium (Ti) and 6061 aluminum (Al) alloys was achieved through a metal inert gas (MIG) arc weld-brazing process. The relationships between the major MIG arc weld-brazing parameters such as travel speed of MIG torch, MIG welding current, argon flow rate of MIG torch, wettability of weld bead and mechanical property of Ti/Al lap-joint specimens were investigated. A proposed approach that integrates the Taguchi method, grey relational analysis (GRA) and fuzzy logic was employed to obtain the optimal MIG arc weld-brazing parameters. The proposed approach was adopted to solve the MIG arc weld-brazing process with multiple quality characteristics (QCs). The experimental procedure of this study not only improves the wettability of weld bead, but also increases the tensile strength of Ti/Al lap-joint specimens. Confirmation experiments revealed that this study could efficiently optimize the MIG arc weld-brazing parameters, and the average tensile strength of Ti/Al lap-joint specimens could reaches 178 MPa. During the MIG weld-brazing, higher argon flow rate of the MIG torch that produces turbulence to the weld pool and brings outside air could create a high amount of porosity over the weld bead.

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Influence of Si content on interfacial reactions and mechanical properties of dual-spot laser welded-brazed Ti/Al joints

Cited by 43 publications

References 34 publications

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

A Review on Laser-Assisted Joining of Aluminium Alloys to Other Metals

Optimization of the MIG Arc Weld-Brazing Process on Titanium and Aluminum Lap-Joint Welds Using the Taguchi Method, Grey Relational Analysis and Fuzzy Logic

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