Tweco HMC-410 - Manual (Page 57)

HMC-410
July 27, 2005 4-15
Crater fill
Crater fill is normally used to reduce heat input to the
work and to fill the crater which is typically left at the
termination of the weld. Crater fill has three programmable
parameters: time, voltage, and WFS.
The crater fill time is programmed in the upper display.
The time can be programmed from 0 to 25.5 seconds, in
.1 second increments.
The voltage is programmed in the center display. The
voltage can be programmed from the minimum
programmable voltage (10.0) to the maximum
programmable voltage (between 36.0 and 44.0), in .2 volt
increments.
The WFS is programmed in the bottom display. The WFS
can be programmed from 0 to 888 IPM (0 to 22.5 MPM),
in 4 IPM (.1 MPM) increments.
Burnback
The burnback function is used to burn back the welding
wire from the work at the termination of the weld. This is
done by turning off the feed motor and leaving the power
source contactor on for a short period of time (typically
.2 second). The burnback segment is programmed in time
and voltage.
The burnback time is programmed in the upper display.
The time can be programmed from 0 to 2.55 seconds, in
.01 second increments.
The voltage is programmed in the center display. The
voltage can be programmed from the minimum
programmable voltage (10.0) to the maximum
programmable voltage (between 36.0 and 44.0), in .2 volt
increments.
Postflow
Programmed in time only, this is the duration of gas flow
at the completion of the weld. The postflow time is
programmed in the upper display. The time can be
programmed from 0 to 25.5 seconds, in .1 second
increments.
Recycle
Recycle is used with the spot weld mode for multiple
executions of a programmed weld cycle. Recycle is
programmed in the number of total cycles (i.e., 5 recycles
results in 5 spot welds), and the delay time between spot
welds. The delay time is the time between the end of the
postflow segment of the previous spot weld and the
beginning of the preflow segment of the next spot weld.
During this time the feed motor, gas valve, and power
source contactor are turned off.
Recycle can also be used in a continuous weld as an ‘end
of weld’ segment. During the programmed Recycle time,
Auxiliary Relay 2 will close. At the conclusion of
Recycle,the panel will return to the Ready Mode,
regardless of the programmed recycle count.
The recycle time is programmed in the upper display. The
time can be programmed from 0 to 25.5 seconds, in .1
second increments.
The count is programmed in the center display. The count
can be programmed from 1 to 255.
Also included in the recycle segment is the weld sub segment
number (if enabled). This number is programmed in the
lower display. The number can be programmed from 1 to 4.