Spark testing is a method of determining the general classification of ferrous materials. It normally entails taking a piece of metal, usually scrap, and applying it to a grinding wheel in order to observe the sparks emitted. These sparks can be compared to a chart or to sparks from a known test sample to determine the classification. Spark testin...
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http://en.wikipedia.org/wiki/Spark_testing
A process for sorting scrap metal, especially high speed steel. The metal is held against a grinding wheel and the colour and length of the spark assessed
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http://www.metalbulletin.com/Glossary.html
This is an inspection method for quickly determining the approxiamte analyst of steel. It is intended primarily for the separation of mixed steel and when properly conducted,is a fast, accurate and economical method of separation. It consists in holding the sample against a high speed grinding wheel and noting the character and color of the spark w...
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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