MAKING WELDING TOOL WITH RARE(SECRETE FILLER METAL)
I suspect that OP was using the term tongue-in-cheek. He used a drill bit as a filler rod to give the pointy bits a harder surface. Such a material is rare in the sense that it is not common in welding rod form.
Jodi Collier of weldmonger.com did a video about this recently. It's a genius idea.
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