ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 25    No. 7    July 2015

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Microstructure characterization and mechanical properties of gas tungsten arc welded cast A356 alloy
S. TAKHTI, M. REIHANIAN, A. ASHRAFI
(Department of Materials Science and Engineering, Faculty of Engineering, Shahid Chamran University of Ahvaz,
Ahvaz 61357-83151, Iran
)
Abstract: The microstructure and mechanical properties of the gas tungsten arc welded cast A356 alloy were investigated with fillers ER1100, ER4043, ER4047 and ER5356 under the pulse frequencies of 1, 3 and 5 Hz. Results showed that the filler metal and pulse frequency affected the grain structure of fusion zone considerably. The highest fraction of eutectic (44%) was formed with filler ER4047. Tensile fracture of all specimens indicated that fracture did not occur in the fusion zone. The greatest impact toughness (about 4 J) was achieved for the welds with filler ER4047 while the largest hardness (HV 90) was obtained with filler ER5356.
Key words: cast A356 alloy; gas tungsten arc welding; microstructure; hardness; impact energy
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
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