Rapid Ultrasonic-Assisted Soldering of AZ31B Mg Alloy/6061 Al Alloy with Low-Melting-Point Sn–xZn Solders Without Flux in Air

Abstract

A novel ultrasonic-assisted low-temperature soldering was developed to join AZ31B Mg alloy and 6061 Al alloy with a series of Sn-xZn solders. The average maximum shear strength of the joints reaches up to 87.5 MPa at soldering temperature of 300°C under ultrasonic assistance for only 5 s using Sn-20Zn solder. The fracture path propagates completely in the soldering seam. The results indicate that the microjet generated by ultrasonic pressure in liquid solder could strike and splinter the Mg 2 Sn intermetallic compounds into small pieces, which contributes to the enhancement of the joint strength. In addition, the primary Al(Zn) solid solution phase formed during cooling stage could also strengthen the joint due to the prevention of microcracks propagation.Acta Metallurgica Sinica (English Letters) (2019) 32:332-342 https://doi.org/10.1007/s40195-018-0749-x( 012 3456789(). ,-volV) (0123456789().,-volV)

Effects of Post-weld Heat Treatment on Microstructure, Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

“…Although electron beam welding (EBW), friction stir welding (FSW) and variable polarity plasma arc welding (VPPAW) and other methods have great advantages in welding aluminum alloys [6][7][8][9][10][11][12], the tungsten inert gas (TIG) arc welding is still the most common welding method in aerospace production lines due to its flexible operation, good weld formation and low cost. Considering that the combination of direct current tungsten inert gas (DCTIG) arc welding and pulse variable polarity tungsten inert gas (VPTIG) arc welding is often applied in the actual products [13,14], we choose the joint obtained from this welding technique as the object of this study.…”