Castolin SynARC 180 Mode D'emploi page 42

CASTOLIN SynARC 180 & SynARC 200
this circumstance, it is unnecessary to unplug the power plug. Keep cooling fan working to cool down the
welder. Welding can be continued after the inner temperature falls into the standard range and the red
indicator is off.
12 BASIC KNOWLEDGE OF WELDING
.
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 operate, and with high adaptability. MMA is
applied to various metal materials with thickness more than 2mm and various structures, in particular to
weldment with complex structure and shape, short weld joint or bending shape, as well as weld joints in
various spatial locations.
12.1 Welding Process of MMA
Connect the two output terminals of the welder to the weldment and electrode holder respectively,
and then clamp the electrode by the electrode holder. When welding, arc is ignited between the electrode
and the weldment, and the end of the electrode and part of the weldment 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 connect two separate pieces of weldement as a whole. 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.
12.2 Tools for MMA
Common tools for MMA include electrode holder, welding mask, slag hammer, wire brush (see Fig.
5-8), welding cable and labor protection supplies.
a)
a) Electrode holder: a tool for clamping electrode and conducting current, mainly including 300A type
and 500A type.
b) Welding mask: a shielding tool for protecting eyes and face from injuring due to arc and spatter,
including handholding type and helmet type. Colored chemical glass is installed on the viewing window
b)
electrode holder welding mask
Fig 8 Tools for MMA
c) d)
slag hammer wire brush