Spark testing metals
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Spark testing of metals is done by noting the type of sparks that issue from a piece of steel that has been put to a grinding wheel, From this one can deduce with some accuracy the type of alloy present (for instance; percentage carbon, vanadium, chromium).
Spark characteristics to note are:
- color
- length
- branching
One of the simplest tests is to note how the sparks branch. Higher carbon steels will produce shorter streams of sparks with a large amount of branching, in contrast low carbon steel will produce a longer stream with less branching. Additionally wrought iron will produce practically no branching, and cast iron extremely short stream with excessive branching.
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