MMA welding procedure

19 September 2019
Saldatura MMA (Manual Metal Arc) / SMAW ( Shield Arc Welding)

Coated electrode welding (MMA) is one of the most common procedures due to its accessible price and the transportability of the accessories required to perform it.

It is an electric welding process where heat is generated by a high-intensity electric arc struck between a coated electrode and the base material, i.e. the material making up the weld workpieces. The arc is shielded by fusion of the electrode coating, which also provides the filler metal.
The process can be electrically powered by direct current (DC) and alternating current (AC).

The following items are necessary for this type of welding:

  • A power source
  • An electrode holder and leads to ensure a contact and therefore current transfer
  • An earth clamp and earth cables to ensure closure of the electrical connection
  • A coated electrode that performs the role of protecting the welding bath and stabilising the arc while guiding the filler material