|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Using Guard Bands to Accommodate Uncertainty in the Spark AES Analysis of Aluminum or Aluminum Alloys When Determining Compliance with Specified Composition Limits
||John G Weritz, Denis Choquette, Thomas Belliveau, Rebecca Wyss, Michael Ruschak, Albert Wills, Olivier Gabis, John Sieber
|On-Site Speaker (Planned)
Every pound of aluminum or aluminum alloys cast and sold is certified to meet The Aluminum Association Inc. registered limits or other specified composition limits. Certification of aluminum and aluminum alloys to specified composition limits is typically done using Spark-Atomic Emission Spectrometry (Spark-AES) following the procedures in ASTM International Standards. Spark-AES Laboratories at major aluminum production facilities normally have excellent analytical practices and follow strict quality control protocols to provide the best results possible. However, every measurement has an associated uncertainty and the measurement of composition using Spark-AES is no exception to the rule. This paper provides a brief discussion of this uncertainty, benefits of using guard bands to set internal operating limits, a model of the risk for sale of out-of-specification products, the main sources of uncertainty of Spark-AES and their potential causes.
||Planned: Light Metals