Final answer:
In Electrogas Welding, the molten weld pool is protected by a gas shield or a flux core within the filler electrode to prevent oxidation of the molten metal.
Step-by-step explanation:
In Electrogas Welding (EGW), the molten weld pool is protected from the atmosphere by a gas shield or by a flux core in the filler electrode. This layer creates a barrier to protect the molten iron from exposure to oxygen, which would cause oxidation and resulting in Fe2O3. The welder's protective gear, including gloves and helmet, are essential for safety as they protect against the intense thermal energy and high-energy electromagnetic radiation generated by the welding process.