Weldclass WeldForce WF-205MST, Operating Instructions Manual

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16 © Weldclass 2019 | E.&O.E. | Edition 2.1
4.3.7 Spool Gun On/Off (MIG)
This setting turns activates or deactivates Spool Gun mode. See separate section for full explanation of
spool gun operation. The Spool Gun indicator light (40) will be illuminated when Spool Gun Mode is turned
on.
4.3.8 Post-Gas Time (TIG)
Pre-Gas (or Post-Flow) setting is adjustable from 0 – 5 seconds. This controls the period of time the shielding
gas continues to flow after the arc has stopped. This protects the weld area from contamination while it is
still hot enough to react with atmospheric gases, after the weld is finished/trigger is released.
4.3.9 Slope Down Time (TIG)
Slope-Down time setting is adjustable from 0 – 10 seconds. When the trigger is released, the welding
current will reduce gradually over the time selected down to 0. This allows the operator to complete the
weld without leaving a ‘crater’ at the end of the weld pool.
4.3.10 Hot Start Adjustment (Stick)
Hot Start setting is adjustable from 0 – 10. Hot start provides extra power when the weld starts to
counteract the high resistance of the electrode and workpiece as the arc is started. It makes igniting the
electrode easier and prevents it from sticking when cold.
4.3.11 Arc Force Adjustment (Stick)
Arc Force setting is adjustable from 0 – 10. Sometimes called ‘Dig’ or ‘Arc Control’. A Stick welder is designed
to produce constant output current (CC). This means with different types of electrode and arc length; the
welding voltage varies to keep the current constant. This can cause instability in some welding conditions
as Stick welding electrodes will have a minimum voltage they can operate with and still have a stable arc.
Arc Force control boosts the welding power if its senses the welding voltage is getting too low. The higher
the arc force adjustment, the higher the minimum voltage that the power source will allow. This effect will
also cause the welding current to increase. 0 is Arc Force off, 10 is maximum Arc Force. This is practically
useful for electrode types that have a higher operating voltage requirement or joint types that require a
short arc length such as out of position welds.
4.3.12 Optional VRD Function (Stick)
This function is disabled by default. To have this feature enabled please contact your WeldForce
distributor.
When enabled, VRD function reduces the welding machines’ open circuit voltage (OCV, or no-load
voltage) to a much safer level of approximately 13.5V. OCV is the voltage measured across the positive
and negative terminals when welding is not in progress.
The VRD function will turn on full welding power/voltage when the resistance between the electrode and
work piece is less than 200 Ohms (i.e. metal to metal contact).
When the VRD function is active, the VRD Active Indicator Light (49) is illuminated.
Figure 9