GALAGAR Smart 160 PFC Manual Técnico De Instrucciones página 30

SMART 160 PFC Pag. 30
2) Welding operation is forbidden while the machine is overload.
Remember to observe the max load current at any moment (refer to the corresponding duty
cycle). Make sure that the welding current should not exceed the maximum load current.
Overload could obviously shorten the machine's lifespan, or even damage the machine.
3) Over-voltage is forbidden.
Regarding the power supply voltage range of the machine, please refer to "Technical
Parameters" table. This machine is of automatic voltage compensation, which enables the
maintaining of the voltage range within the given range. In case that the input voltage exceeds
the stipulated value, it would possibly damage the components of the machine.
4) An earth terminal is available for the machine.
Connect it with an earth cable to avoid the static and electric shock.
5) A sudden halt may occur with the overheating indicator on the front panel on while the
machine is of overload status .
Under this circumstance, it is unnecessary to restart the machine. Keep the built-in fan working to
lower the temperature inside the machine. Welding can be continued after the inner temperature
falls into the standard range and the overheating indicator is off.
11. 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 workpiece with complex structure and shape, short weld joint or
bending shape, as well as weld joints in various spatial locations.
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
is 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.
Tools for MMA
Common tools for MMA include electrode holder, welding mask, slag hammer, wire brush (see
Fig. 11-1), welding cable and labor protection supplies.