How to Say "to fuse" in Spanish
The Spanish word for “to fuse” is “fusionar” — B1 level.

Examples
Las dos empresas se van a fusionar el próximo mes.
The two companies are going to merge next month.
El restaurante intenta fusionar la comida japonesa con la peruana.
The restaurant tries to blend Japanese food with Peruvian food.
Es posible fusionar estos dos metales a una temperatura muy alta.
It is possible to fuse these two metals at a very high temperature.
Using 'se' with fusionar
When you want to say two things merge into each other, use 'fusionarse'. For example: 'Las piezas se fusionaron' (The pieces merged together).
The 'con' connection
Use 'con' (with) when you are blending one thing into another. 'Fusionamos el jazz con el flamenco' (We blend jazz with flamenco).
Mixing up 'mezclar' and 'fusionar'
Mistake: “Mezclamos las dos compañías.”
Correction: Fusionamos las dos compañías. 'Mezclar' is just mixing; 'fusionar' means they become one whole new entity.
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