A welding electrode is a metal rod typically coated with a flux and infused with two different metals, wires, or filler materials. This electrode plays a pivotal role in various welding processes. When connected to a welding machine and applied to the base metal, the extreme electrical heat generated causes the electrode to melt, forming a weld that joins two distinct pieces of metal. The flux coating on the electrode serves multiple purposes, such as shielding the molten metal from atmospheric contamination, creating a stable arc for welding, and facilitating the removal of impurities.

Welding electrodes come in different types, each designed for specific applications and metal types. They are widely used in industries such as construction, manufacturing, and automotive for joining metals with a durable, smooth finish. The choice of welding electrode depends on factors like the type of metal being welded, the welding method employed, and the desired properties of the finished weld.