CHAPTER 3: USING UB25 WELDING FUNCTIONS
UB25 LINEAR DC RESISTANCE WELDING CONTROL
3-2
990-665
Section II. Weld Schedules
Definition
Weld Schedule
is the name given to each of 99 separate
weld profiles
stored in the Power Supply,
numbered from
01
→
99
. A weld profile is the graphic representation [or
waveform
] of the numeric weld-
time and weld-energy values.
NOTE
: There is an additional weld schedule numbered
00
, which can be
used as a "scratch pad" to develop new weld schedules.
When time and energy values are entered using the numeric keypad, the Power Supply displays a line-
graph of the weld profile on the LCD screen. You can see the graph change as you enter new time and
energy values.
Weld profiles may be programmed for
single-pulse
,
upslope / downslope
, or
dual-pulse
operation. Weld
schedules may also use special monitoring features of the Power Supply such as
Energy Limit,
Active
Part Conditioner,
and
Pre-Weld Check
. These features are described later in this chapter.
Weld Sequence Timing
A weld schedule is a unique heat profile programmed in constant
current
,
voltage
, or
power
that is
applied over a fixed time period, to resistance weld different parts. The entire weld can include all of the
following time periods: Squeeze Time, Upslope 1, Weld Pulse 1, Downslope 1, Cool Time, Upslope 2,
Weld Pulse 2, Downslope 2, and Hold Time. The sample dual-pulse profile [or
waveform
] below shows
the weld current and the corresponding position of the weld head. The graph labeled
WELD CURRENT
is
what displays on the LCD when you schedule a weld profile.
Sample Weld Sequence (Dual-Pulse)
