Final answer:
Arc welding is the subject being referred to when the same type of arc is used in more than one place. It is a process that uses an electric arc to join metal pieces together.
Step-by-step explanation:
The subject being referred to when the same type of arc is used in more than one place is Arc welding.
Arc welding is a process that uses an electric arc to join metal pieces together. It is commonly used in industries such as construction, manufacturing, and automotive repair.
In arc welding, the electric arc is formed between an electrode and the workpiece. The heat generated by the arc melts the metal pieces, which then solidify to form a strong bond. The same type of arc can be used in different locations to create consistent and durable welds.