Answer :
Final answer:
Flux-cored arc welding includes self-shielding and external shielding gas processes, each with distinct characteristics.
Explanation:
Flux-cored arc welding (FCAW) processes can be categorized into one that is self-shielding and the other that uses external shielding gas. The self-shielding process, known as Gasless or Self-Shielded FCAW, eliminates the need for external shielding gas by using a flux material within the core of the wire to create a protective atmosphere. On the other hand, the process that uses external shielding gas is referred to as Gas-Shielded FCAW, where an external shielding gas like CO2 or a mixture of CO2 and argon is used to protect the molten weld pool from atmospheric contamination.
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