Explain why a high current is used to cut metals with an electric arc?

In order to cut the metal, it must be heated (either with gas or electricity). Using electricity as a heat source, it is necessary to give a large amount of current, sufficient so that the current can overcome the air pocket between the electrode and the working surface on the one hand, and on the other hand, so that the metal can be heated to the required melting temperature. That is, in fact, when cutting metal with an electric arc, it is spot melted along the cut line.