The central metal electrode or core wire is consumable to provide the filler metal for the weld. Shielding of the weld pool is provided by the decomposition of some components of the electrode covering.
Properties of MMA Welding:
MMA welding is the most flexible and one of the most widely used arc welding processes
The process uses an electric arc to fuse joint areas
The consumable electrode consists of a metal core wire covered in a concentric clay-like mixture
The process may be operated with an AC or DC power source
This process requires highly skilled welders to produce good quality welds
The process does not require a separate shielding gas.