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The welding TIG process
TIG DC
This welding mode in direct current (DC) is designed for ferrous metal such as steel, stainless steel or even copper
and its alloys.
TIG AC
This welding mode in alternating current (AC) is used to weld aluminium and alloys. This process is set up with
two parameters:
Balance principle
+
-
+
-
+
-
An alternating current is used to weld aluminium and its alloys. During the positive wave, oxidation is
broken (cleaning). During the negative wave, the electrode cools and the parts are welded (penetration).
By modifying the ratio between 2 alternatives through the balance adjustment, you choose either cleaning
or penetration.
Frequency principle
The frequency enables adjustment of the arc concentration.
The higher the frequency, the more concentrated the arc. The
lower the frequency the wider the arc will be. In AC mode, the
frequency is manually adjusted. When using AC Easy mode,
this setting is automatically adjusted according to the diameter
of the electrode used and welding current. It is recommended
to use AC in Easy mode.
TIG Pulse (Pulse)
This welding mode is an independant process, different from welding on standard DC or AC. It is not available on 4T
LOG.
The pulses match the alternated increase and decrease of the current (peak current, base current). With the pulse
mode you will have greater control when welding thin gauge pieces of metal together with a lower degree of
distortion.
In pulse mode, the settings are:
- The I Coldcurrent is in percentage and sets up between 20% and 80% of the welding current. The cold current
reduces heat input during welding.
- The Pulse frequency (Hz Pulse) is set up between 0.1 Hz to 250Hz.
- The Pulse balance (%T_PULSE) is the % of cold current set up during a period (1: Period = 1/Hz Pulse)
Example:
The welding current “I” is set up at 100A.
I_Cold = 50%, which means = 50% of 100A = 50A.
Hz_Pulse is set up at 10Hz and %T_PULSE at 30%. The period of the signal will be at 1/10Hz = 100ms. The time of
« I Cold » will be at 30% of this period, 30ms.
Advice: the lower the current will be (thin metal sheet), the higher the pulse frequency will be. Conversely when the
current is high, it is better to use low frequencies. For I>100A, F (Hz) 100 Hz
Balance : 20% Minimum cleaning
80% Maximum penetration
50%
60% Maximum cleaning
40% Minimum penetration
Low frequency
High frequency
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