Final answer:
Dissimilar metals can be joined using the arc welding process if the proper filler metal is used.
Step-by-step explanation:
In arc welding, dissimilar metals can be joined if the proper filler metal is used. Arc welding is a process that uses electricity to create an electric arc between an electrode and the base metal. The heat generated by the arc melts the base metal and filler metal, which then solidify to form a welded joint.
For example: If you want to join a steel plate to an aluminum plate, you would use a filler metal that is compatible with both steel and aluminum, such as an aluminum-based filler wire.