What is the purpose of flux on an electrode?

The purpose of flux on an electrode is primarily to clean metal surfaces during welding or soldering processes. When metals are being joined, it's crucial that the surfaces are free of contaminants such as oxides, dirt, or other impurities that could interfere with the bonding process. Flux acts as a cleansing agent by chemically reacting with these unwanted substances, allowing for a better, stronger connection between the metals.

While some other substances in welding may provide insulation or protect from moisture, those functions are not the primary roles of flux. Flux specifically targets the improvement of the quality of the weld by ensuring that the metal surfaces are properly prepared before the welding process begins. By facilitating the removal of oxide layers and other contaminants, flux ensures optimal metal-to-metal contact and stronger joint integrity.