Miller DYNASTY 350, Руководство пользователя

Страница: 53 / 136

OM-216 869 Page 47
5-10. Pulser Control
1
3
2
Peak Amp
Bkg Amp
Peak 50%/Background 50%
Balanced 50%
More Time At
Peak Amperage
More Time At
Background
Amperage
Pulsed Output Waveforms
Percent (%) Peak Time
Control Setting
(80%)
(20%)
PPS
4
1 Pulser Control
Pulsing is available while using the TIG process. Con-
trols can be adjusted while welding.
Press switch pad to enable pulser.
ON - When illuminated, this LED indicates the pulser is
on.
Press switch pad until desired parameter LED is illumi-
nated.
To turn Pulser off, press and release switch pad until the
On LED turns off.
2
Encoder Control (Set Value)
3 Ammeter (Displays Value)
See Section 5-15 for all Pulser parameter ranges.
PPS - Pulse frequency or pulses per second, is the num-
ber of pulse cycles per second. Pulse frequency helps
reduce heat input, part warpage, and helps weld bead
cosmetics. The higher the PPS setting, the smoother the
ripple effect, the narrower the weld bead, and the more
cooling you get. By setting PPS on the lower end, the
pulse is slower, and the weld bead wider. This slow puls-
ing helps agitate the weld puddle to help release gas
trapped in the weldment, and help reduce porosity (very
useful in aluminum welding). Some beginners use a
slower pulse rate (2-4 pps) to help them with their timing
on adding filler material. An experienced welder may
have the PPS setting much higher, depending on their
personal preferences, and on what they are trying to ac-
complish.
PEAK t - (PEAK t) is the percentage of time in each cycle,
spent at peak amperage (main amperage). Peak amper-
age is set with the Amperage control (see Section 5-3).
If one pulse per second is being used, and peak time is
set at 50%, one-half second is spent at peak amperage,
and the other 50%, or one-half second, is spent at the
background amperage. Increasing peak time increases
time spent at peak amperage, which increases heat input
into the part. A good starting point for peak time is about
50-60%. To find a good ratio, you will have to experiment
a bit, but the idea is to decrease heat input into the part,
and increase the cosmetics of the weld.
BKGND A - (Background amps) is set as a percentage
of the peak amps setting. If peak amps is set at 200, and
background amps at 50%, your background amps is 100
amps when the machine pulses on the background side
of the cycle. The lower background amperage helps re-
duce heat input. Increasing or decreasing background
amps increases or decreases the overall average am-
perage, which helps determine how fluid your puddle is
on the background side of the pulse cycle. Overall, you
want your puddle to shrink to about one-half the size, but
still remain fluid. To start with, set background amps at
about 20-30% for stainless/carbon steel, or at about
35-50% for aluminum alloys.
4
Pulsed Output Waveforms
Example shows affect changing the Peak Time control
has on the pulsed output waveform.
Application:
Pulsing refers to the alternating raising and lowering of
the weld output at a specific rate. The raised portions of
the weld output are controlled in width, height, and fre-
quency, forming pulses of weld output. These pulses and
the lower amperage level between them (called the back-
ground amperage) alternately heat and cool the molten
weld puddle. The combined effect gives the operator bet-
ter control of penetration, bead width, crowning, under-
cutting, and heat input. Controls can be adjusted while
welding.
Pulsing can also be used for filler material addition tech-
nique training.
Function is enabled, when LED is lit