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In this video, I’ll show you an easy way to determine the carbon content of your steel parts. You can use this technique to find which of your parts would benefit from the case hardening method used in my last video. This is not the most accurate way of determining the composition of the steel, but many welders use this technique when welding unknown materials and is a good test for most non-critical jobs. This technique is known as spark testing.

If anyone knows where the spark diagrams came from, leave a comment below. I found the chart here: https://bbs.homeshopmachinist.net/threads/65000-Help-identifying-this-piece-of-steel/page2

See my instructables account for step by step guides to some of my projects: https://www.instructables.com/member/Proto+G/

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