This course develops a qualitative understanding of porosity in terms of the Neutral Thermal Axis (NTA) and how casting shapes and heat flows influence the NTA setting the stage for the next three parts of the series. The NTA is an imaginary surface through the interior of the casting that is the last place to solidify and hence is also the location of the porosity whether gas porosity or shrinkage porosity. Before one can influence porosity, he/she must understand what causes it to be where it is and understand it in terms of those things that the casting designer, die designer and process control technician has control of.
Certification Level: Level II Process
Date of Presentation:7/22/15
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