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What does MMA stand for?

MMA stands for Manual Metal Arc (welding)

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Samples in periodicals archive:

We also have a vastly experienced team which deliver NVQs programmes, such as Manual Metal Arc and Metal Inert Gas, amongst others.
In this research, Frost & Sullivan's expert analysts thoroughly examine the following applications: metal inert gas/ metal active gas (MIG/MAG) welding equipment, submerged arc welding (SAW) equipment, manual metal arc welding (MMAW) equipment, laser and hybrid welding equipment, flux-cored wires, submerged arc wires (SAW) and fluxes, stick electrodes, solid wires.