Forge welding and hammering are carried out simultaneously.
<<Forge welding stage>>
First, by hammering material, 3 sheets of materials turns into 1 sheet.
<<Forge hammering stage>>
Next, the material that has turned one turns into a stronger material by hammering further. During this process, "komi (dent)" area is formed in the material, and the shape and the thickness are adjusted for the desired knife.
The way massive steal turns into the shape of a knife simply by using a hammer is really like watching a mysterious and enchanting scene of Japanese "candy sculpting."