Interface morphology and microstructure of high-power ultrasonic spot welded Mg/Al dissimilar joint

Int J Adv Manuf Technol

Xing

et al. 2022

The ultrasonic welding was carried out to improve the quality of dissimilar Al/Mg alloys joint. The effects of laser texturing on the microstructure and mechanism of AZ31B/5052 joint connected by ultrasonic welding were also investigated. A series of laser texturing experiments on Al alloy (5052) and Mg alloy (AZ31B) were performed to determine the process parameters and their effect on ultrasonic weld quality, especially on weld strength. Little effect was attained by optimizing welding parameters in improving mechanical properties. Both welding parameters and different texture pattern were investigated to obtain good weld quality. The connection mechanisms of joints were discussed based on the analysis of weld interface morphology, microstructure evolution. Mechanical analysis of particle and movement of material atoms were analyzed in the study to explain the connect mechanism. The results show that the better lock-interface and lager lap shear strength were attained by laser texture addition and optimal welding parameters. Compared with the untextured joint, swirling bonding interface was obtained after the laser texture. The laser texture with grid pattern was found to raise the strength up to 26% higher maximum tensile-shear load than the joints obtained with the untextured surface.

Section: Introductionmentioning

confidence: 92%

Investigation on mechanism of ultrasonic welding AZ31B/5052 joint with laser texturing on mental surface

Int J Adv Manuf Technol

Xing

et al. 2022

“…Shah et al 7 found that the superimposed ultrasonic energy promoted bonding formation at the Al/Fe interface, increased the bonding area, and removed interfacial cracks that were generally observed in conventional resistance spot welding. Feng et al 8 applied a high-power ultrasonic welding technology to study the connection mechanism of joints, and they found that ultrasound can effectively shorten the welding time, reduce the formation of intermetallic compounds, and improve the strength of Mg/Al dissimilar welded joints. Zhao et al 9 observed the microstructure of the wetting interface after ultrasonic exposure and found that the ultrasonic vibration resulted in metallurgical bonding with a compact interface during the ultrasonically brazing of aluminum matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Improvement of interface anchoring by ultrasonic vibration for adhesively bonded CFRP/Al joints

Journal of Reinforced Plastics and Composites

Tong

et al. 2021

Adhesively bonded carbon fiber reinforced polymer (CFRP)/Al joints have been widely used in engineering field. However, the bonding strength still needs to be improved. In this study, ultrasonic vibration was applied during the adhesive bonding to promote the micromechanical anchoring at the interface of CFRP/Al joints. Ultrasonic vibration was exerted on the CFRP laminate to transmit the vibration to the adhesive bonding area once the joint was assembled. The strength and the strength consistency of the joints were increased by 45% and 50%, respectively. Scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) results showed that the ultrasonic vibration promoted the filling of the adhesive into the microstructures of the adherends and achieved a more compact bonding. Viscosity and contact angle of the adhesive were measured, and both of them were decreased greatly under the ultrasonic vibration, indicating that the ultrasonic vibration can increase the fluidity of the adhesive and force the wetting between the materials. Ultrasonic capillary experiment was then conducted. The adhesive in the capillary tube was prompted to rise obviously, and the meniscus was inverted with ultrasonic vibration, showing that the ultrasonic vibration produced a driving effect on filling of the adhesive in the microstructures. Therefore, the joints exhibited improved bonding strength owing to the enhanced micromechanical anchoring and physical adsorption at the bonding interface. This study is of great significance for understanding and optimization of the ultrasonic vibration strengthened adhesive bonding.

“…With the rapid improvement of industrial technology, aluminum (Al) alloy has been widely used in the manufacturing field [1][2][3][4]. As a kind of high strength Al alloy, LC9 (7A09) alloy is one of the most remarkable alloys in China.…”

Section: Introductionmentioning

confidence: 99%

Thermal deformation strengthening of WC-10Co4Cr coating prepared by high velocity air-fule process

Zhang

2020

Mater. Res. Express

In this paper, WC-10Co4Cr coating was prepared on the surface of LC9 aluminum alloy by high velocity air-fule (HVAF) process. And a thermal deformation method was developed to enhance the coating properties. Experimental results show that, during the process of thermal deformation, the increase of temperature and deformation amount could improve the microhardness of coating surface. With temperature of 480°C and deformation amount of 16% (0.8 mm), the microhardness reached the maximum value of 1349 HV0.3, which increased nearly 20% compared with that of specimen (1137 HV0.3) without compressive deformation. Besides, the strengthening effects of thermal deformation temperature and deformation amount on the bonding strength of coating were obvious. With deformation temperature of 450°C and deformation amount of 8% (4 mm), the bonding strength reached the maximum critical load of 188 N, which was 17.5% higher than that of initial state.