Which type of welding uses a bare wire consumable electrode fed automatically into the weld pool?

The process that uses a bare wire consumable electrode fed automatically into the weld pool is Submerged Arc Welding. This technique involves feeding a continuous bare wire electrode into the weld area, where it melts and contributes to the weld pool. The arc is created beneath a layer of granulated flux, which not only shields the molten metal from atmospheric contamination but also helps in the welding process by providing a stable environment for the arc and generating additional heat.

In contrast, the other welding methods mentioned utilize different approaches. Metal Arc Gas Shielded Welding generally employs a shielded electrode and does not automatically feed the electrode into the weld pool. Tungsten Arc Gas Shielded Welding uses a non-consumable tungsten electrode and requires a separate filler material, making it distinct from the automatic feeding characteristic of submerged arc welding. Gas Metal Arc Welding also uses a consumable wire electrode, but it is not always bare and typically operates with an external shielding gas, distinguishing it from submerged arc welding which relies on the flux.