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

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 usin...

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Bibliographic Details
Published in:Applied sciences 2022-05, Vol.12 (9), p.4417
Main Authors: Babu, Nagumothu Kishore, Talari, Mahesh Kumar, Srirangam, Prakash, AlFaify, Abdullah Yahia, Rehman, Ateekh Ur
Format: Article
Language:English
Subjects:
Alloys
Alternating current
AZ31 Mg alloy
Base metal
Discount coupons
Ductility
Friction
Gas flow
Grain size
GTA welding
Hardness
Hot rolling
Investigations
Lasers
Magnesium
Mechanical properties
Microstructure
Scanning electron microscopy
Solidification
Strain hardening
Tensile properties
Tensile strength
Tungsten
Weld metal
Welding
welding speed
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Summary: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.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12094417