GYS PROTIG 221 DC FV Manuel D'utilisation page 25

Operating manual
PULSED DC TIG WELDING
This pulsed-current welding mode alternates high-current pulses (I, welding pulse) and low-current pulses (I_Cold, a pulse that cools the workpie-
ce). This pulsed mode makes it possible to assemble parts whilst limiting the temperature rise.
Example:
If the I (welding pulse) is set at 100 A and the % (I_Cold) is set at 50%, then the cold current = 50% of 100 A = 50 A. If the frequency (Hz) is set to 2
Hz, the signal period will be 1/2 Hz = 500 ms. This means that a 100 A welding pulse will be alternated with a 50 A cold-current pulse every 250 ms.
Advice:
Choosing a frequency:
• If welding with manual filler metal, then F (Hz) is synchronised with the welding motion.
• If welding thin sheet metal without using filler metal (< 0.8 mm), then F (Hz) should be > 10 Hz.
Description
Pre-Gas
Current rise
Welding current
Cold current
Pulse rate
Fade out time
Post-Gas
TIG - Advanced menu
It is possible to set the welding cycle's Start and Stop stages.
START
By scrolling the machine's turn dial, the advanced settings can be accessed in the following way:
Settings Description
I_Start Current level when starting up the welding machine.
T_Start Time required for the welding start-up stage
I_Stop Current level when welding is stopped
T_Stop Time taken to stop the welding process
The setting that you wish to adjust can be selected by pressing the 'JOB' button. Once it has been changed using the central turn dial (I), it is validated
by pressing the 'JOB' button again.
The advanced menu can be exited by pressing 'ESC'.
Translation of the original
instructions
PULSED DC TIG WELDING
The greyed-out fields cannot be used in this mode.
Settings Description and advice
0 - 60 s Time taken to purge the torch and create a gas shield before ignition
0 - 60 s Rising current ramp
5 - Imax Welding current
20 - 99% The second so-called 'cold' welding current
0.1 - 2,000 Hz Pulse rate
0 - 60 s Descending current ramp
The amount of time the gas shielding is sustained after the arc is extinguished. It protects
0 - 60 s
the part, as well as the electrode, against oxidation (S).
One can access these advanced settings by pressing the 'JOB' button for longer than
three seconds until 'SET', and then 'UP', is displayed on the screen.
Once the button is released, use the central turn dial to select 'SET' in the drop-down
menu. Validate this by pressing the 'JOB' button.
STOP
PROTIG 221 DC FV / TIG 300 DC
Configuration
10 - 200%
0 - 10 s
10 - 100%
0 - 10 s
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