Installation of 2lb(1kg) Roller
11. BASIC KNOWLEDGE OF WELDING
11.1 MMA
Manual metal arc welding, MMA for short, is an arc welding mode by manually operating electrode.
Equipment for MMA is simple, convenient and flexible to be operated with high adaptability. MMA is
applied to various metal materials with thickness more than 0.79 inch and various structures, in
particular to workpiece with complex structure and shape, short weld joint or bending shape, as well as
weld joints in various spatial locations.
11.2 Welding Process of MMA
Connect the two output terminals of the welder to the workpiece and electrode holder respectively,
and then clamp the electrode by the electrode holder. When welding, arc is ignited between the
electrode and the workpiece, and the end of the electrode and part of the workpiece are fused to form a
weld crater under the high-temperature arc. The weld crater is quickly cooled and condensed to form
weld joint which can firmly integrally connect two separate pieces of workpiece. The coating of the
electrode is fused to produce slag to cover the weld crater. The cooled slag can form slag crust to protect
the weld joint. The slag crust is removed at last, and the joint welding is finished.
1) Unscrew the top cover and unscrew the
inner knob with pliers.
2) Take off the outer large roller and the
1kg roller show out. And take out inside
spare parts for next steps.
3) Install 2lb(1kg) wire on the roller.
4) Put spare parts removed in step 2 back
on the roller. Tighten the knob removed in
step 1)
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