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Shielding gas
In TIG welding, shielding gas is used to prevent atmospheric contamination of the molten
weld pool. Normally, the shielding gas is argon (Ar), and the gas ow rate is approximately
8–15 litres per minute, but this can vary according to the welding current used and the size of
gas nozzle.
The machine is delivered with a 4.5 m long shielding gas hose. Connect the supplied female
snap connector of the shielding gas hose to the machine’s male hose connector. Connect the
free end of the shielding gas hose to the gas bottle, via a suitable and approved single stage
regulator valve, where outlet ow rates can be adjusted.
NOTE! Never attempt to connect directly to a compressed gas cylinder. Always use an approved
and tested regulator and ow meter.
1.
2.
4.
l/min
5
10
15
20
3.
Connecting the gas hose to a typical welding regulator control valve
1. Connect the supplied shielding gas hose to machine and via a suitable coupling to the
gas regulator control valve outlet and tighten the connector.
2. Open the valve of the bottle
3. Measure the ow.
4. Adjust the ow by the knob (8–15 l/min).
NOTE! Use a suitable shielding gas for the welding application. Always secure the gas cylinder in an
upright position with either a specially made wall rack or cylinder trolley. Always close the cylinder
valve after welding.
MinarcTig Evo 200, 200MLP
8
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