"This part is the biggest mystery. What happens is called solid state diffusion bonding by the sciencedudes, but for me, it's soaking the stack with the blaze of the furnace, coaxing the metals to join in an unholy union of metals. There are other ways of firing the billet, but this one is mine. You must know it in your soul when the metals are reaching for their melting points but because of the pressure they reach for each other instead. They will to be one solid block of metal. Then the assembly is taken out of the firing kiln."