CHAPTER 6: ADVANCED WELD FUNCTIONS
2 KHZ INVERTER WEDLING POWER SUPPLY
990-057
6-3
WELD/REPEAT (Figure 6-4)
Weld/Repeat provides a repeat capability for
simple automated Air Actuated Weld Head
applications using an operator. This weld
function is ideal for volume production, which
requires a single schedule.
Weld/Repeat can only be used with an Air
Actuated Weld Head. For Force Fired Air
Actuated Weld Heads, weld current begins when
both levels of a two-level Foot Switch are closed
and the Force Firing Switch in the Air Actuated
Weld Head closes.
Figure 6-4. Weld/Repeat
When Weld/Repeat is used with a Non-Force Fired Air Actuated Weld Head, the Squeeze (SQZ) Period
must be used to allow sufficient time for the electrodes to close and apply the required weld force to the
parts before the Weld Period begins. Weld current begins when the Squeeze Period ends and both levels
of a two-level Foot Switch are closed.
When Weld/Repeat is used with any type of Air Actuated Weld Head, the Hold Period can be used to
automatically keep the electrodes closed on the parts after weld current has terminated for the purpose of
providing additional heat sinking or parts cooling. Squeeze and Hold Periods have no meaning with
Manually Actuated Weld Heads and do not appear on either the weld schedule Program or Run screens.
Off Period, which is applicable only to Weld/Repeat, sets the cycling rate between spot welds by
controlling how long the electrodes remain open to allow the parts to be repositioned before the entire
weld process repeats.
Weld/Repeat Weld Graph Run Screen
(Figure 6-5)
Weld schedule 002 is pre-programmed at the
factory for Weld/Repeat operation and will only
function using an Air Actuated Weld Head.
