Lincoln Electric POWER WAVE 455M CE Manual De Instrucciones página 11

rc ontrol
A C :
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 setting
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.
Constant Voltage Welding
Synergic CV:
For each wire feed speed, a corresponding voltage is
pre-programmed into the machine through special
software at the factory. The nominal pre-programmed
voltage 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 automatically
adjusts the voltage level correspondingly to maintain
similar arc characteristics throughout the WFS range.
Non Synergic CV:
This type of CV mode behaves more like a conventional
CV power source. Voltage and WFS are independent
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 picture
below).
Pulse Welding
Pulse welding procedures are set by controlling an
overall "arc length" variable. When pulse welding, the
arc voltage is highly dependent upon the waveform. The
peak current, background current, rise time, fall time and
pulse frequency all affect the voltage. The exact voltage
for a given wire feed speed can only be predicted when
all the pulsing waveform parameters are known. Using a
preset voltage becomes impractical, and instead the arc
length is set by adjusting "trim".
Trim adjusts the arc length and ranges from 0.50 to 1.50,
with a nominal value of 1.00. Trim values greater than
1.00 increase the arc length, while values less than 1.00
decrease the arc length.
Most pulse welding programs are synergic. As the wire
feed speed is adjusted, the Power Wave will
automatically recalculate the waveform parameters to
maintain similar arc properties.
The Power Wave utilizes "adaptive control" to
compensate for changes in electrical stick-out while
welding (Electrical stick-out is the distance from the
contact tip to the work piece.). The Power Wave
waveforms are optimized for a 19mm stick-out. The
adaptive behavior supports a range of stickouts from
13mm to 32mm. At very low or high wire feed speeds,
the adaptive range may be less due to reaching physical
limitations of the welding process.
Arc Control, often referred to as wave control, in pulse
programs usually adjusts the focus or shape of the arc.
Wave control values greater than 0.0 increase the pulse
frequency while decreasing the background current,
resulting in a tight, stiff arc best for high speed sheet
metal welding. Wave control values less than 0.0
decrease the pulse frequency while increasing the
background current, for a soft arc good for out-of-
position welding (see picture below).
455M/STT only: STT Welding
The pictures illustrate the wave shape of current for the
process. They are not drawn to scale, and are intended
only for the purpose of showing how the variables effect
the waveform.
Trim in the STT mode adjusts the tail out and
background portion of the waveform. For open root
processes, the tail out is fixed, and the trim affects only
the background level. Trim values greater than 1.0 add
more energy to the weld and make the weld puddle
hotter; trim values less than 1.0 reduce energy to weld.
A nominal value of 1.0 will work for most applications
(see picture below).
For most programs, peak current is adjusted by arc
control, also referred to as wave control. A wave control
value of +10.0 maximizes the peak current, while a wave
control of -10.0 minimizes peak current. In general, the
peak current is proportional to the arc length (see picture
below).
11