Weldability assessment of Mg alloy (AZ31B) sheets by an ultrasonic spot welding method

Leon, Michael de; Shin, Hyung-Seop

doi:10.1016/j.jmatprotec.2016.11.022

Cited by 26 publications

(11 citation statements)

References 15 publications

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“…It addition, though the bonding temperature was set in 340°C, the actual temperature at the contact interface is expected to be higher than that measured. It may attribute to the heat generation occurred because of the frictional vibration [24]. The eutectic constituents indicated that the eutectic reactions took place on the solder side and the Mg side, respectively.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic-assisted fluxless reactive bonding of Mg/Al dissimilar alloy using Zn–Al solder in air

Lai

Pan

et al. 2018

Science and Technology of Welding and Joining

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An ultrasonic-assisted reactive brazing method, without flux and conducted in air, was developed to braze Mg/Al dissimilar alloys. By using pre-coated Zn-Al solders on the Al sheet and a short-time ultrasonic (3 s) assistance, the Mg/Al dissimilar sheets were successfully brazed at a low temperature (340°C). The effect of Al content of the solder on the shear strength was investigated based on the analysis of the microstructure and the fracture behaviour of the brazed joint. The results indicated that the microstructure and the shear strength of the ultrasonic-assisted brazed joint were significantly affected by Al content in Zn-Al solders. Increasing Al content in Zn-Al solder prevented the joint from forming the continuous brittle MgZn 2 layer. The maximum shear strength of 110.5 MPa was obtained when Zn-15Al solder was used, because the joint possessed the optimum microstructure of the soft (Al, Zn) eutectoid matrix with the MgZn 2 dispersed particles.

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Section: Resultsmentioning

confidence: 99%

Ultrasonic-assisted fluxless reactive bonding of Mg/Al dissimilar alloy using Zn–Al solder in air

Lai

Pan

et al. 2018

Science and Technology of Welding and Joining

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“…Vibration energy is applied through a bonding tool attached to the tip of a sonotrode, and this vibration induces relative motion between the bonding materials. A number of studies in the literature have focused on the influence of process parameters, including normal force, vibration amplitude and bonding time, on the bondability of various types of metal sheets [2][3][4][5][6][7][8]. In the ultrasonic bonding process, micro-bonds are initially formed at the bonding interface owing to the relative motion of the bonding material.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Bonding of Multi-Layered Foil Using a Cylindrical Surface Tool

Arimoto

Sasaki

Doi

et al. 2019

Metals

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A cylindrical tool was applied for ultrasonic bonding of multi-layered copper foil and a copper sheet to prevent damage to the foil during bonding. The strength of the joints bonded with the cylindrical tool was comparable to that of the joints bonded with a conventional knurled tool. The effect of the cylindrical surface tool on bondability was investigated thorough relative motion behaviors between the tool surface and the bonding materials, as well as on bond microstructure evolution. The relative motion was visualized with in-situ observation using a high-speed camera and digital image correlation. At shorter bonding times, relative motions occurred at the bonding interfaces of the foil and the copper sheet. Thereafter, the relative motion between the tool and the bonding material became predominant owing to bond formation at the bonding interface, resulting in a macroscopic plastic flow in the bonded region. This relative motion damaged the foil in knurled tool bonding, and the cylindrical tool achieved bonding without any damage.

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“…The material flow and plastic deformation volume of the welded area increased with increasing vibration amplitude due to the increment of the frictional heat. [26,28,29] Therefore, when a significantly higher vibration amplitude (>60 μm) was applied, excessive frictional energy intensity promoted the formation of microcracks in the Cu interlayer (Fig. 3(h,j)).…”

Section: Resultsmentioning

confidence: 98%

“…[27] These are credited for decreasing the yield strength of the joints, though contributing for the creation of a sound metallurgical bonding along the weld interface. During the USW process, the average temperature around the weld interface is known to increase as the vibration amplitude increases, [28] suggesting the occurrence of significant heat generation due to higher frictional vibration levels. Therefore, the surface friction energy dissipation became faster after the vibration amplitude increased, resulting in a temperature rise around the weld interface, which further leads to an increasing shear plastic deformation capacity on the weld surfaces.…”

Section: Resultsmentioning

confidence: 99%

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

Zhang

et al. 2020

Materials and Manufacturing Processes

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NiTi thin sheets were ultrasonic spot welded with a Cu interlayer, where different welding vibration amplitudes were applied to study the influence on the surface and interface microstructural characteristics, phase transformation behavior and mechanical response of the joints, which aimed to enhance the joint performance by proper optimization of the process parameters. An excellent bonding interface was achieved when an optimized vibration amplitude was applied, with a recrystallized microstructure formed in the Cu foil side near the bonding interface, which helped to improve the mechanical performance of the joints. Joints made with vibration amplitude of 55 μm had an improved strength compared to the NiTi base material.

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Weldability assessment of Mg alloy (AZ31B) sheets by an ultrasonic spot welding method

Cited by 26 publications

References 15 publications

Ultrasonic-assisted fluxless reactive bonding of Mg/Al dissimilar alloy using Zn–Al solder in air

Ultrasonic-assisted fluxless reactive bonding of Mg/Al dissimilar alloy using Zn–Al solder in air

Ultrasonic Bonding of Multi-Layered Foil Using a Cylindrical Surface Tool

Variable-parameter NiTi ultrasonic spot welding with Cu interlayer

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