Manual Metal Arc Welding

Manual metal arc (MMA) welding, is a type of manual arc welding process that uses a consumable electrode coated with flux to lay the weld. An electric current, in form of either alternating current or direct current from a welding power supply, is used to form an electric arc b/w the electrode and the metals to be joined. As the weld is going on, the flux coating of the electrode disintegrates, giving off vapors that serve as a shielding gas and providing a layer of slag, both of which protect the weld area from atmospheric degradation.