14
Operators Manual
Quality
•
Reliability
•
Performance
8 General Maintenance
Before removing the power
source covers, ENSURE that the
equipment is disconnected from
the mains power supply. When the
equipment is energised LETHAL
VOLTAGES are present on the
electrical components enclosed.
Dust
Care should be taken to prevent excessive
build-up of dust and dirt within the welding
power source. It is recommended that at
regular intervals, according to the prevailing
conditions, the equipment covers be removed
and any accumulated dust be removed by the
use of dry, low pressure compressed air, or a
vacuum cleaner.
Wirefeed
In order to obtain the most satisfactory
welding results from the G.M.A.W. process,
the wirefeed must be smooth and constant.
Most causes of erratic wirefeed can be cured
by basic maintenance. Check that the:
1 Feed rolls are the correct size and type for
the wire in use. Check also that the drive
groove is aligned with the wire and that
the groove is not worn;
2 Gun cable liner is clear of dust and swarf
build-up. When replacement becomes
necessary, fit only the correct liner (see
page 22). The build-up of dust can be
minimised by regular purging of the liner
with dry compressed air. This may be
conveniently done each time the wire
spool is replaced;
3 Welding tip is free of obstructions such
as spatter build-up. Ream out the tip
bore with a suitable size oxy-tip cleaner.
Replace the welding tip as it becomes
worn;
Fig 8
Gun Position
Gun Position
For “down hand” fillet welding, the gun is
normally positioned as shown in Figure 8
below with the nozzle end pointing in the
direction of travel.
Fig 7
“Bad” Weld
A “bad” weld is shown in Figure 7. The weld
has not penetrated the joint root, and there
is poor side wall fusion. This lack of fusion
would normally be corrected by increasing
the arc voltage, or by increasing both
wirefeed speed and arc voltage to achieve a
higher current weld setting.
Содержание WELDMATIC 270C
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