Constant Voltage Welding - Lincoln Electric POWER WAVE 355/405 SVM159-A Service Manual

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In non-synergic modes, the WFS control behaves
more like a conventional CV power source where WFS
and voltage are independent adjustments. Therefore to
maintain the arc characteristics, the operator must
adjust the voltage to compensate for any changes
made to the WFS.
In constant current modes (stick, TIG) this control
adjusts the output current, in amps.
• VOLTS / TRIM:
In constant voltage modes (synergic CV, standard CV)
the control adjusts the welding voltage.
In pulse synergic welding modes (pulse GMAW only)
the user can change the Trim setting to adjust the arc
length. It is adjustable from 0.500 to 1.500. A Trim set-
ting of 1.000 is a good starting point for most condi-
tions.
• WELDING MODE
May be selected by name (CV/MIG, CC/Stick Crisp,
Gouge, etc.) or by a mode number (10, 24, 71, etc.)
depending on the Control Box options. Selecting a
welding mode determines the output characteristics of
the Power Wave power source. For a more complete
description of the welding modes available in the
Power Wave, see the explanation below.
• ARC CONTROL
Also known as Inductance or Wave Control. Allows
operator to vary the arc characteristics from "soft" to
"harsh" in all weld modes. It is adjustable from -10.0 to
+10.0, with a nominal setting of 00.0 (The nominal set-
ting of 00.0 may be displayed as OFF on some Power
Feed wire feeder control panels). See the Welding
Mode descriptions, below, for detailed explanations of
how the Arc Control affects each mode.
Current
Time
OPERATION

CONSTANT VOLTAGE WELDING

Synergic CV:
For each wire feed speed, a corresponding voltage is
preprogrammed into the machine through special soft-
ware at the factory. The nominal preprogrammed volt-
age is the best average voltage for a given wire feed
speed, but may be adjusted to preference. When the
wire feed speed changes, the Power Wave automati-
cally adjusts the voltage level correspondingly to main-
tain similar arc characteristics throughout the WFS
range.
Non Synergic CV:
This type of CV mode behaves more like a conven-
tional CV power source. Voltage and WFS are inde-
pendent adjustments. Therefore to maintain the arc
characteristics, the operator must adjust the voltage to
compensate for any changes made to the WFS.
All CV Modes:
Arc Control, often referred to as wave control, adjusts
the inductance of the wave shape. The wave control
adjustment is similar to the "pinch" function in that it is
inversely proportional to inductance. Therefore,
increasing wave control greater than 0.0 results in a
harsher, colder arc while decreasing the wave control
to less than 0.0 provides a softer, hotter arc.
(See Figure B.2)
FIGURE B.2
POWER WAVE 355/405
CURRENT WAVE FORM (CV)
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