CHAPTER 6: ADVANCED WELD FUNCTIONS
MODEL HF2 2 kHz HIGH FREQUENCY RESISTANCE WELDING POWER SUPPLY
990-057
6-5
When Quench/Temper 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 Quench/Temper 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.
Quench/Temper - Weld Graph Run Screen
(Figure 6-8)
Weld schedule 003 is pre-programmed at the
factory for Quench/Temper operation. The HF2
Weld Control automatically recognizes the
presence of a Manually or Air Actuated Weld
Head before the first weld is made.
Figure 6-8. Quench/Temper -
Weld Graph Run Screen
Quench/Temper - Alphanumeric Run
Screen (Figure 6-9)
To simultaneously view all pre-programmed
time periods and energy settings, press [CHNG]
to select the Alphanumeric Run screen. The 7
digit Weld Counter is displayed in the upper
right corner.
Figure 6-9. Quench/Temper -
Alphanumeric Screen
PRE/POSTHEAT (Figure 6-10)
Pre/Postheat is very similar to Quench/Temper.
Pre/Postheat is also typically used to weld flat-to-
flat, round-to-round, or round-to-flat parts together
that may or may not be plated. In addition, Pre/
Postheat works well to create forge type welds
when welding refractory materials such as
molybdenum and tungsten together.
Pre/ Postheat is the most versatile of all of the weld
functions. The user can construct a custom weld
function by controlling the three Periods, Preheat,
Weld, and Postheat and their related weld currents.
Figure 6-10. Pre/Post Heat