Hitbox ARC160D, Operation Instruction Manual, Page: 13 / 20

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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 max 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 (section
≥
6mm
2
) to
avoid the static and electric shock.
5) A sudden halt may occur with the yellow LED on the front panel on while the machine is of over-load
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 yellow LED is off. There may be something failed if
the yellow LED keeps illuminating.
13. 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.
13.1 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.
13.2 Tools for MMA
Common tools for MMA include electrode holder, welding mask, slag hammer, wire brush (see Fig. 5),