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GUIDE TO MMA WELDING
Before starng any welding acvity ensure that you have suitable eye protecon and
protecve clothing. Also take the necessary steps to protect any persons within the welding
area.
MMA process ps and guides
Typical welder set up
1. Electrode holder
2. Work return clamp
3. Work piece
4. Weld material covered
by electrode ux or slag
5. Electrode
6. Distance from work to
electrode (arc Length)
Welding current will ow in the circuit as soon as the electrode contacts the work piece. The welder
should always ensure a good connecon of the work clamp. The nearer the clamp is placed to the
welding area the beer.
When the arc is struck the distance between the end of the electrode and the work will determine the
arc voltage and also aect the weld characterisc. As a guide the arc length for electrodes up to 3.2mm
diameter should be around 1.6mm and over 3.2mm around 3mm.
Upon compleon of the weld the welding ux or slag will need to be removed usually with a chipping
hammer and wire brush.
Joint form in MMA
In MMA welding, the common basic joint forms: bu joint, corner joint, lap joint & T joint.
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