Parweld DP323C, Руководство пользователя

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5.3 CONNECTOR FOR MIG WELDING with a Spool
or Push-Pull torch
1) Connect the earth cable to the appropriate ‘- ‘
socket. (17 of figure 1). Insert by lining up the key with
the groove and turn in a clockwise direction until it
stops. Do not fasten too tightly!
2) Connect the torch to the appropriate socket on the
front of the device (15 of Fig 1), turning in a clockwise
direction until it stops. Do not fasten too tightly!
3) Insert the connector of the torch into the appropriate
female socket.
MIG WELDING:
Connect the pressure
regulator to the cylinder,
after which attach the gas
tube of the torch to the
latter.
MIG welding is usually
carried out with a
constant current, with
a positive pole (“+ “see
fig.5). The MIG torch
cable is connected to
the Euroconnector (15
of fig.1), whilst the earth
cable of the workpiece is
connected to the ‘-‘ socket
on the front (17 di fig.1).
At this stage adjust the welding current using the
potentiometer (9 of Fig.1), situated on the front panel.
The diameter of the electrode and the welding current
settings must be selected according to the thickness of
the workpiece.
6. STRIKING AN ARC IN MIG WELDING The
MIG-MAG welding process is when an electric arc
is created between a consumable wire and the
workpiece, protected within a gas atmosphere. This
atmosphere can be either inert (Argon) or active (CO2
or a mixture of Argon and CO2).
The wire is continuously fed through a torch by a wire
feeder to the weld pool. A solid wire or flux-cored wire
can be used.
The transfer methods of the filler material define
different arc types:
SHORT ARC (short-circuit transfer): this brings the
electrode into direct contact with the weld pool, which
creates a short-circuit that extinguishes the arc, after
which the arc reignites and the cycle is repeated.
SPRAY ARC (spray transfer): this allows the droplets
to detach from the tip of the electrode, which
successively reach the weld pool. The fact the arc is
visible, reduces the need for the operator to strictly
observe the adjustment tables, allowing for direct
control of the welding pool.
- the tension directly influences the appearance of
the welding seam, but the dimensions of the welding
surface can be varied, according to requirements,
by manual movement of the torch to obtain variable
deposits with a constant tension.
- the speed of the movement of the wire is in relation to
the welding current.
7. ADJUSTING THE WELDER Once the welding
tension has been set, maintain the length of the
electric arc between 5 and 10 mm and adjust the wire
speed to achieve the best welding results. Initially,
carry out a welding test on a well-cleaned sample, free
of any coating, rust or paint.
NOTE The torch trigger controls the following
functions:
- gas flow - wire movement
- welding current
8. HOW TO ACHIEVE THE BEST WELDING
RESULTS
1. Hold the torch at an angle of 45° from the
workpiece. Keep the gas nozzle (Fig. 4A) at a distance
of approximately 6 mm from the workpiece.
15