Lincoln Electric INVERTEC SVM161-A Service Manual page 27

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PROTECTIVE GAS
Both argon and helium work when welding aluminum.
Argon is preferred, due to its lower cost and consump-
tion rate. This gas also tends to stabilize the arc, thus
making it easy to operate. For some applications, how-
ever, the use of helium, or argon-helium blends, is rec-
ommended due to better weld penetration and faster
travel speed. Helium is especially suitable for welding
thick workpieces. The recommended gas flow rates
are shown in table 5.
TABLE 5
Current (A)
50
100
150
200
250
300
AC TIG WELDING QUICK START UP
WARNING
ELECTRIC SHOCK can kill.
• Have an electrician install and
service this equipment.
• Turn the input power off at the fuse box, dis-
connect or unplug supply lines and allow
machine to sit for five minutes minimum to
allow the power capacitors to discharge
before working inside this equipment.
• Do not touch electrically hot parts.
------------------------------------------------------------------------
Connect the shielding gas – typically argon – using a
appropriate regulator. Connect the foot amptrol, torch
and work lead to the power source.
With the work cable connected to a properly grounded
work piece, turn the power source on.
OPERATION
Helium cfh-(l/min)
29 - (14)
29 - (14)
42 - (20)
42 - (20)
53 - (25)
53 - (25)
INVERTEC® V205-T AC/DC™
The Invertec® V205 T AC/DC TIG is ready to AC TIG
weld with the following features:
• AC TIG
• Trigger Mode in 2 step mode
• Local control
• Pulser off
• AC Square Wave
• AC Balance 65% EN
• AC Frequency 100HZ
• Pre Flow .5sec.
• Post Flow 5 sec.
• High Freq Start
Change from Local to Remote control by pushing front
panel push button.
Set the maximum output current desired using the
Output Control. Initiate the arc by closing the arc start
switch. The Amptrol will control the output current from
10 amps to current level set by Output Control.
To change the AC Frequency, press and hold the
Parameter button for 3 seconds. The AC Frequency is
now selected and can be varied by the Output Control.
The frequency is displayed on the digital meter. After
about 5 seconds, the power source will switch back to
the welding mode ready to weld with the new selected
AC Frequency.
To change the AC Balance, press and hold the
Parameter button for 3 seconds, AC Frequency is
selected, press the Parameter button again and AC
Balance is selected. Adjust the Output Control for the
desired AC Balance. After about 5 seconds, the power
source will switch back to the welding mode ready to
weld with the new selected AC Balance.
To change the Post Flow time, repeatedly push the
Parameter button until the Post Flow indicator light is
on. Adjust the Output control to the desired Post Flow
time as indicated on digital display.
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