Aluminum foundries are forced to standardize their casting processes to meet the increasing demand of premium quality castings at a globally competitive price. In processing aluminum alloys by casting processes, one has to cope not only with problems pertaining to casting technology and design, but in particular with difficulties encountered by various kinds of impurities contained in the metals. Among the other priorities of metal quality, we focused to standardize the hydrogen gas in 319 aluminum alloy melting and handling processes in the manufacture of sand-cast manifolds. The present standardization study of melt quality revealed that: i. There exists different levels of gas and inclusions in the existing melt stream, which needs to be optimized for a desired manifold sand casting with the requirements of both internal and external customers. ii. The gas levels in the existing melt stream has been established based on specific gravity and gas standards for porosity are used as an additional test when using Reduced Pressure Test (RPT) samples.
展开▼
