MMA Welding
Operation
MMA is a fusion welding process that uses the heat generated by an electric arc to fuse metal in the joint area, the arc being struck between a covered consumable electrode and the workpiece.
The process consists of a welding power source, that may provide either an AC, DC or DC and AC electric current. Connected to this power source is an electrode holder into which the electrode is placed. The circuit is completed with an earth return cable fixed between the power source and the workpiece.
When the arc is struck between the tip of the electrode and the workpiece, the core wire begins to melt, and the coating provides a protective gas-and-slag covering to the weld.
As the core wire melts, the operator must maintain a constant arc length – distance between the end of the electrode and the workpiece – to prevent the arc extinguishing. Parent metal in the immediate area of the arc is also melted and this combines with molten metal from the electrode to form a weld pool.
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