Final answer:
The term for the permanent joining of electrical parts is soldering, a process that uses a filler metal to connect components to a circuit board, not to be confused with fusion, circuitry, or integration.
Step-by-step explanation:
The term for the permanent joining of electrical parts is soldering. Soldering is a process where a filler metal, called solder, which has a lower melting point than the adjacent metal, is melted to join metallic surfaces together. This technique is widely used in electronics to securely join components to circuit boards. Unlike fusion, which is the melting together of materials by heat, soldering does not usually melt the base materials themselves. Circuitry refers to the design and layout of electrical circuits, and integration often refers to combining components or systems to function together.