Characterization of Microstructure, Weld Heat Input, and Mechanical Properties of Mg–Al–Zn Alloy GTA Weldments

Applied Sciences

Nagumothu Kishore Babu¹  Mahesh Kumar Talari¹  Ateekh Ur Rehman²  Abdullah Yahia AlFaify²  Prakash Srirangam³ 

[1] Department of Metallurgical and Materials Engineering, National Institute of Technology, Warangal 506004, Telangana, India;Industrial Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK;

关键词: AZ31 Mg alloy;    welding speed;    GTA welding;    microstructure;    mechanical properties;   

DOI  :  10.3390/app12094417

来源: DOAJ

【 摘 要 】

The present study investigated the influence of welding speed on the microstructure, hardness, and tensile properties of the AZ31 Mg alloy gas tungsten arc (GTA) welds that were prepared using alternating current (AC). A microstructural examination of the weld metal and base metal was performed using stereo, optical, and scanning electron microscopy (HR-SEM and EDS) techniques. The microstructure of all fusion zones consists of two parts: a columnar zone, adjacent to the fusion boundary, and equiaxed grains, in the centre of the weld fusion zone. It is shown that the average width of the equiaxed zone present at the centre of the fusion zone increases with increasing welding speed. Metallographic examination shows that the highest welding speed (5 mm/s) results in the smallest average grain size. The welds prepared with high welding speed exhibit an increase in strength, hardness, and ductility compared with other welding speeds, which is attributed to low heat input.

【 授权许可】

Unknown