There are two ways to bond mokume. Three if you count a melt down as one

Difusion bonding, done under pressure and under the mealting temp. of the
resulting alloy at the bond surface.

The 'sweating' way, where it is done under much less pressure and idealy
right at the melting temp of the alloy made at the juntion of the base
metals. If too hot the base metals start to melt and that happens too often
to me But I have learned better too hot than too cold.

Les