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.
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Schedule a callMore From: Transactions of Nonferrous Metals Society of China
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