Lincoln Electric IM611 TIG PULSER - Manual (Page 13)

B-3 OPERATION B-3
PEAK CURRENT knob
If the mode switch is set to Amptrol 2-step, the peak
welding current can be controlled by an Amptrol from
minimum up to the limit set by this knob.
If the mode switch is set to either the Arc Start Switch
2-step position or the 4-step position, the setting on
this knob determines the peak welding current.
Note: The MAX position on this knob is equivalent to
about 90% of the maximum output current of the
power source.
This setting adjusts the wetting and bead shape dur-
ing the peak pulse time of each cycle.
TIG PULSER PRESET
When using the TIG Pulser with a power source with
the preset capability, the peak welding current can be
preset with the Peak Current knob on the TIG Pulser.
• Preset in 2-step TIG mode:
Adjust the Peak Current and read the preset on the
power source display. For TIG Pulser code number
10472, when mode switch is set to Amptrol 2-step
the power source will always display the minimum
preset; to preset the peak current set the mode
switch to Arc Start Switch 2-step and adjust the
Peak Current then set to Amptrol 2-step if welding
with an Amptrol.
• Preset in 4-step TIG mode:
Set the Background Current to PULSER OFF posi-
tion, adjust the Peak Current to preset, then set the
Background Current to the desired level.
In 4-step TIG mode the preset alternates between
peak and background currents when the
Background Current is not set at pulser off posi-
tion, and therefore the power source display also
alternates between peak and background currents.
TIG PULSER
BACKGROUND CURRENT knob
Use this knob to set the background current as a per-
centage of the peak current. If set at PULSER OFF
position, the welding current will be normal as if weld-
ing without the TIG Pulser, that way non-pulsing weld-
ing can be done without having to disconnect the TIG
Pulser.
• This setting is adjusted as low as will maintain the
arc during the background current time. 40 - 60% is
a typical starting point.
% ON TIME knob
This knob controls the duration of the peak current as
a percentage of one pulse cycle. For instance if set at
40%, the welding current will remain at peak for 40% of
one pulse cycle and at the background current for 60%
of one pulse cycle.
• This setting controls the total heat of the weld as a
balance between peak pulse and background times
affecting distortion and burnthrough. 40 - 60% is a
typical starting point.
PULSES PER SECOND knob
Use this knob to set the frequency or the number of
pulses per second, from 0.5 pulse per second to 20
pulses per second.
• This setting adjusts bead shape to travel speed.
Thinner plate with faster travel speed will require
higher frequency than thicker plate with slower travel
speed. 2 - 3 is a typical starting point.
The following table may be used as a guide line to pre-
set the TIG Pulser when connecting to a SW TIG 175:
TIG PULSER SW TIG 175
PEAK CURRENT OUTPUT CURRENT
DIAL REFERENCE (AMPS)
MIN. 10
1 25
2 35
3 45
4 55
5 65
6 75
7 90
8 110
9 135
MAX. 160