9
shown in the figure.
After the welding operation remember to switch off the
machine and to close the cylinders.
3.4 SPOT WELDING
For spot welding, replace the gas-weld nozzle with the
special spot-weld nozzle. Make enough pressure with the
torch to achieve a good junction of metal sheets.
This is obtained by setting the welding time (H pict. 1)
and/or the pause time (L pict. 1).
Attention: metal sheets will have to be perfectly clean.
3.5 INSTRUCTIONS FOR REPLACEMENT OF WIRE
REEL
!
Turn the welder off: switch (1) in OFF position.
!
Remove the mobile cover (23).
!
Cut the wire end coming out from the current nozzle
with a well sharpened toll.
!
Release the wire pressing unit (D fig. 2).
!
Wind the wire by rotating the reel anticlockwise.
!
Look the wire end in the side hole of the spool.
!
Loosen the ring nut of the support (21), remove the
reel and replace it.
For the assembly of the reel follow the instruction of the
paragraph "START-UP".
NOTE:
The reel carrier can be fitted both with the 8 inches
(10 LB) diameter reels and the 11 13/16 inches (30 LB)
diameter reel.
4 MAINTENANCE AND CHECK UP
4.1 GENERAL NOTES
WARNING: ELECTRIC SHOCK CAN KILL.
!
Do not touch live electrical parts.
!
Turn off the power source and remove input power
plug from receptacle before, inspection, maintenance,
servicing.
Moving parts can cause serious injury.
!
Keep away from moving parts.
!
HOT SURFACES can cause severe burns.
!
Allow cooling the unit before servicing.
!
Periodically clean the transformer or diodes from any
dust or foreign bodies; for this purpose, use a dry and
clean air jet. When reinstalling the drive roll, ensure
that the groove is aligned with the wire and that it
corresponds to the diameter of the wire used.
!
Keep the inside of the gas nozzle constantly clean so
as to avoid metal bridges formed by welding spatter
between the gas nozzle and the contact tip.
!
Make sure that the contact tip outlet has not widened,
if so, replace it.
!
The torch must not be banged or violently knocked.
4.2 WELDING MACHINE SERVICING
Experience has shown that many fatal accidents originated
from servicing improperly executed. For this reason, a
careful and thorough inspection on a serviced welding
machine is just as important as one carried out on a new
welding machine.
Furthermore, in this way producers can be protected from
being held responsible for defects stemming from repairs
not carried out by the manufacturer.
4.2.1 Prescriptions to follow for servicing.
!
After rewinding the transformer or the inductances, the
welding machine must pass the applied-voltage test in
accordance with indications in table 2 of 6.1.3 of the
EN 60974 standard (CEI 26.13). Conformity must be
checked as specified in 6.1.3.
!
If no rewinding is done, a welding machine that has
been cleaned and/or reconditioned must pass an
applied-voltage test with voltage values equal to 50%
of the values given in table 2 of 6.1.3. Conformity must
be checked as specified in 6.1.3.
!
After rewinding and/or the replacements of the no-load
voltage should not exceed the values given in 10.1 of
EN 60974.
!
If the servicing is not done by the manufacturer, the
repaired welding machines which underwent
replacements or modifications of any component, shall
be marked in a way such that the identity of the person
having serviced it is clear.
4.2.2 Instruction to be followed after all repair work.
Following any repair work, great care must be taken when
refitting cables and wires to ensure safe and proper
insulation between the primary and secondary sides of the
machine.
When refitting wires and cables, ensure that wires cannot
come in contact with moving part or those parts that heat up
during operation.
Refit clips and straps in their original position and in such a
way that any accidental cable breakage or disconnection
will not lead to a dangerous contact between the primary
and secondary circuits.
