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CHAPTER 5. OPERATING INSTRUCTIONS
HF28 DC RESISTANCE WELDING SYSTEM
990-372 5-15
Section V. Resistance Set
NOTE:
The
Resistance Set
tool is very similar to the
Active Part Conditioning
tool. The difference
is that the first pulse is programmed as all Upslope for Resistance Set, where it is programmed as all
Weld Time (Square Wave) for Active Part Conditioning. The Resistance Set pulse is programmed as all
Upslope to keep both the Voltage and Current low at the beginning of the pulse.
1. Press the
SCHEDULE
key, then select a Weld Schedule using
either
the

arrows
or
the numeric keypad.
2. Program a single pulse for
Constant Power
operation, but program the time in the Upslope
portion of Pulse 1. Program the Weld Time and Downslope of Pulse 1 to 0.0 ms. Program the
power level and Upslope time to cause slight sticking between the two parts. Make a few
welds and pull them apart. Increase or decrease the power setting until a light tack weld is
achieved.
3. From the
MONITOR
keys section on the front panel, press the voltage
V
key and
observe gradual rise of the voltage waveform.
4. From the
MONITOR
keys section on the front panel, press the
Ω
(resistance) key and
observe the resistance waveform. This should appear to begin high, then start to drop as
a tack weld is made and the resistance decreases.
5. From the
MONITOR
keys section on the front panel, press the
kA
(current) key and
observe the current waveform starting to rise as the resistance decreases. If the current
waveform starts to flatten, this is an indication that the resistance has stabilized and the
parts have come into closer contact.
6. Push
RUN
and optimize the energy and time setting of Pulse 1 to provide an adequate
tack weld and also a current waveform (view in the monitor screen) that has started to
flatten out, but is still rising. This indicates that a full melt has not yet occurred.
7. From the
MONITOR
keys section
on the front panel, press the
kA
key to program an upper current
limit on the
MONITOR
screen.
NOTE
: You can toggle between
PEAK
and
AVERAGE
readings by pressing the
PEAK/AVERAGE
key.
8.
9.
Press the
COOL
weld period
key. This will bring up the
PULSE 1 OUT OF LIMITS
ACTION
screen.
Select
4. PART CONDITIONER
(Stop PULSE1).
PULSE 1 OUT OF LIMITS ACTION
1. none
2. STOP WELD
3. INHIBIT PULSE 2
4. PART CONDITIONER (Stop Pulse1)
NUMBER Select, Page, RUN or MENU