Which welding process uses a continuously fed wire electrode?

The question asks to identify the welding process that uses a continuously fed wire electrode.

• TIG welding (Tungsten Inert Gas welding) uses a non-consumable tungsten electrode and often a separate filler rod, which is manually fed.
• MIG welding (Metal Inert Gas welding) uses a consumable wire electrode that is continuously fed through the welding gun.
• SMAW welding (Shielded Metal Arc Welding) uses a consumable stick electrode that is not continuously fed.
• Gas tungsten arc welding is another name for TIG welding.

Therefore, MIG welding is the process that uses a continuously fed wire electrode.

The final answer is $\text{B}$.