Metabo WIG 170 DC Operating Instructions Manual page 12

ENGLISH
Welding current I
Maximum current for the actual welding
process.
Setting range, in 1 A increments
- for TIG welding: 5 A...170 A
- for stick electrode welding: 5...140 A.
3
Note:
During the welding process the
current nominal welding current value is
displayed.
If an upslope or downslope value other
than 0 is set, the value displayed on the
display changes continously when start-
ing and ending the welding process, until
the end value is reached. Simultane-
ously the LED of the respective active
parameter is flashing during this time.
The welding current can be changed
anytime during the welding process with
the + or - buttons.
3
Note:
If a foot-operated remote control
unit is connected, the machine will
always switch into 2-step mode.
When a hand-operated remote control
unit is connected, the working current
can only changed by this control.
Current setting range
remote control unit: minimum current to
set working current.
Current setting range hand-operated
remote control unit: minimum current to
maximum current.
Upslope
Speed at which the current slopes up to
the maximum welding current. This
value can only be changed in any of the
TIG welding modes.
Setting range 0...100.
The ramp response adjusts linear.
At a value of 0 the nominal value is out-
put directly, e.g.for spot welding.
At a value of 100 the welding current
slopes up at approx. 8 A/sec, until the
nominal current is reached. At a value of
50 it slopes up twice as fast at 16 A/sec.
Downslope
Speed at which the current slopes down
to the minimum welding current. This
value can only be changed in any of the
TIG welding modes.
Setting range 0...100.
The ramp response adjusts linear, see
"Upslope".
Gas postflow time t.
Period the shielding gas will flow after
the welding process has ended.
This value can only be changed in any of
the TIG welding modes.
Setting range 0.0...25.0 sec, in incre-
ments of 0.2 seconds.
12
5.3 Starting up
Gas-shielded arc welding
A
Caution!
Check
work:
− Correct shielding gas connected?
− Correct gas shroud fitted?
− Electrode tip still pointed?
Regrind if necessary.
3
Note:
Grind electrodes for DC welding
in lengthwise direction only.
1. Attach welding return cable at a suit-
able location to the workpiece.
2. Open cylinder valve and set desired
gas flow rate.
Change gas shroud, if necessary.
3. Turn master switch ON.
4. Select desired welding process.
5. Set desired welding current.
The welding machine is now opera-
tional.
Stick electrode welding
1. Attach welding return cable at a suit-
foot-operated
able location to the workpiece.
2. Turn main switch ON.
3. Select welding process "Electrode".
4. Set desired welding current.
The welding machine is now opera-
tional.
5.4 Shutting down
1. Close gas cylinder valve.
2. Set master switch to "0".
3. Disconnect welding return cable
from workpiece.
4. Unplug power cable.
5.5 General safety informa-
tion
All legal regulations pertaining to the
operation
machines must be observed.
The following information should be
observed as well for a safe and risk-free
handling of the welding machine!
B
Danger!
Electric potential!
− Use machine indoors and in dry
environment only.
− Connect machine only to a properly
earthed outlet.
If in doubt check with a qualified
electrician!
− Service and repairs to the machines
must only be made by qualified elec-
tricians.
− Unplug
machine's cover.
before starting any
of electric arc welding
before removing the
A
Danger!
− Wear sufficient protective clothing
when welding.
− Always use a welding shield or hel-
met and welder's gloves.
They provide protection against
sparks and arc radiation.
− All metal fumes are detrimental to
health!
When working indoors ensure suffi-
cient ventilation and extraction in
order to not exceed the maximum
permissible workplace pollutant con-
centration.
Fumes of lead, cadmium, copper,
zinc and beryllium are especially
harmful!
A
Caution!
− Never weld earthed metal.
This will prevent possible damage to
the protective earth conductors by
stray welding currents.
− Always attach the welding return
cable directly to the workpiece and
as close as possible to the welding
spot.
− Special care is required when work-
ing near computers, electronically
controlled equipment or in the prox-
imity of magnetic data media (sound
recording tapes, floppy disks, data
recording tapes, credit cards, etc.).
The arc start can cause misfunction
of this type of equipment or data
loss.
6. Maintenance
This welding machine contains no user-
serviceable parts.
Depending on dust accumulation the
dust should be blown out from the
machine with dry and oil-free com-
pressed air every 4 - 6 months.
Periodically perform a check for visible
damage.
Contact a qualified electrician if any of
the cables are damaged.
7. Available Accessories
For the WIG 170 DC series we recom-
mend the following accessories. These
accessories have been tested with the
machine and ensure unproblematic
operation.
A TIG torch Mistral,
1) 4 m torch leads
2) 8 m torch leads
B Pressure regulator with 2 pressure
gauges
1) without stop valve
2) with stop valve