One Farrier's Rasp, Forge Welded Into an Axe Bit, Explained

A single farrier's rasp — the toothed steel file farriers use to shape horse hooves — becomes the cutting edge of a hand-forged axe in a video titled "Forge welding the axe bit made from a farriers rasp," posted to YouTube and indexed by Google News. The clip documents a blacksmith taking the worn file and forge welding it to a separate piece of steel to form the axe's bit, the edge that does the cutting work when the tool is finished.

What does "forge welding" mean in this build?

Forge welding is one of the oldest joining methods in metalwork: two pieces of steel are heated in a forge until their surfaces are hot enough to soften and bond, then hammered together so the metal fuses without filler rod, flux wire, or an electric welder. The title of the video names the process directly — forge welding — rather than arc welding or brazing, which signals the join is being made entirely with heat and hammer control inside the forge, the traditional approach for joining an axe bit to an axe body.

Why use a farrier's rasp for an axe bit?

Farrier's rasps are made to file and shape horse hooves, which means they are manufactured from hardened, high-carbon tool steel tough enough to stand up to repeated contact with keratin and horn. That same carbon content is what blacksmiths look for when choosing steel for an edge tool: once a rasp has worn down and lost its bite for hoof work, the bar stock underneath still carries the carbon needed to harden and hold a sharpened edge. Recycling a spent rasp into an axe bit, rather than buying new edge-steel stock, is the choice documented in the video's description.

How does the rasp attach to the rest of the axe?

The video's title specifies that the rasp becomes "the axe bit," meaning the file is shaped into the wedge-shaped insert that will do the cutting, while a separate body of steel forms the rest of the axe head, including the eye that will later take a handle. To join them, the two pieces are typically overlapped at their mating faces, brought up to welding heat together in the forge, and then struck with hammer blows that drive out scale and force the hot surfaces into one solid piece of steel. That sequence — shaping the rasp, matching it to a body piece, and forge welding the two at heat — is the build shown in the clip.

What happens to the axe after the weld is made?

Once an edge-steel insert like a farrier's rasp is successfully forge welded into an axe body, the finished head still needs heat treatment before it can be used: the bit is typically normalized, hardened, and tempered so the recycled rasp steel reaches a working edge hardness, then ground and sharpened to its final profile. None of those downstream steps are detailed in the video's title or Google News listing, so this piece does not claim specifics about the hardening or grinding sequence used in that particular build — only that forge welding the bit is the step the video is named for.

Where can the technique be watched in full?

The build itself is viewable through the Google News listing for the video, which links through to the original YouTube upload. For smiths who want hands-on instruction in forge welding and edge-steel work rather than a video alone, a Portland, Oregon blacksmith has begun offering knife forging classes that cover related edge-tool shaping and heat-treating fundamentals. Scrap-steel builds like a rasp-bit axe remain a common entry point into bladesmithing precisely because the raw material — a used file, in this case — is inexpensive and already heat-treatable, long before a smith invests in bar stock made specifically for edge tools.