Home Made Mini D

so how have you hardened and tempered it?
welding will have altered the grain structure of the metal

"also thinking tungston brazed onto steel could be an idea this destroys most cutting wheels on grinders"
it's also very brittle.

grain structure only alters if you quench, leave to cool naturally and structure stays the same. and to harden you heat to cherry and quench a few times sorted. gonna nitride it aswell.