Functional characteristics
TIG welding
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099-00T500-EW501
2.9.2022
5
Functional characteristics
5.1 TIG welding
5.1.1 Setting the shielding gas volume (gas test)/rinse hose package
• Slowly open the gas cylinder valve.
• Open the pressure regulator.
• Switch on the power source at the main switch.
• Set the relevant gas quantity for the application on the pressure regulator.
• Press the push-button “gas test / flush” to activate the gas test
> see 5.1.1 chapter
.
Setting the shielding gas quantity (gas test)
• Shielding gas flows for 20 s or until the push-button is pressed again.
Purging long hose packages (purging)
• Press push-button for about 5 s. • Shielding gas flows for approx. 5 min. or until the push-button is
pressed again.
If the shielding gas setting is too low or too high, this can introduce air to the weld pool and may cause
pores to form. Adjust the shielding gas quantity to suit the welding task!
Setting instructions: The gas nozzle diameter in mm corresponds to the gas flow in l/min.
Helium-rich gas mixtures require a higher gas volume!
The table below can be used to correct the gas volume calculated where necessary:
Shielding gas
Factor
75% Ar/25% He
1.14
50% Ar/50% He
1.35
25% Ar/75% He
1.75
100% He
3.16
For connecting the shielding gas supply and handling the shielding gas cylinder refer to the
power source operating instructions.
5.1.1.1 Automatic gas post-flow
When the function is enabled, the machine control adjusts the gas post-flow time depending on the out-
put. The adjustable gas post-flow time relates to the maximum possible current of the power source and
decreases linearly.
Example: With the automatic gas post-flow function enabled, a gas post-flow time of 10 s has been set.
This means that with a welding current of 230 A, the gas post-flow time is 10 s. At a welding current of
115 A, the gas post-flow time is reduced to 5 s.
The automatic gas post-flow function
can be enabled or disabled in the machine configuration
menu
> see 5.11 chapter
. With the function enabled, the parameters
and
for automatic are dis-
played alternately when the gas post-flow time is selected.
