.
14 © Weldclass 2020 | E.&O.E.
4.3 Function Selection
1. Press Pulse Selection Button until the desired Indicator Light is lit. If no indicator is lit then the
machine is in Standard Non-Pulse mode.
NOTE: Functions are only available in TIG modes.
Figure 7
4.3.1 ON (Standard Pulse)
Pulse welding mode switches the welding output between a high and low current output in a cyclical
manner. When used correctly this function has substantial benefits in the TIG welding process
including greater weld penetration for less work heat input and greater control of the weld pool.
The basic theory for setting the base current using pulse mode is that the base current should be
sufficient to maintain the existing molten weld pool, while the main current is sufficient to melt new
metal in order to move/expand the molten weld pool. Increased pulse frequency will have the effect
of making the arc more tightly focused which is useful for fine stainless work and similar.
Pulsing can also be used to help move the weld pool, this technique is useful for welding out of
position or with materials that have higher viscosity weld pool. Higher pulse duty setting will give
greater heat input, while lower pulse duty will have the opposite effect.
See 12.3.3 for more information.
4.3.2 EASY (Easy Pulse Function)
This is the same as Standard Pulse, however the advanced arc settings are automatically set based on
(or in proportion to) the main current setting. This makes it much simpler for inexperienced TIG welders
to set up and weld with pulse.
These settings are;
Base Current/Amps I1
[A]
= 70% of Main Current/Amps I2
[A]
Pulse Frequency = 4 Hz
Balance = 50%
These settings can be adjusted/changed if required, however they will revert to the pre-set values
if/when the Pulse mode is changed and/or the machine is re-started.
4.3.1 BiLEVEL (Bi-Level Current Function)
Bi-Level Function is a non-pulse function that enables the operator to swap between 2 current levels (I
1
& I
2
) whilst welding using the torch trigger. 4t Trigger Mode must be selected to enable Bi-Level
selection. During welding a quick press of the trigger will toggle between I
1
current setting and I
2
current
setting.
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