Kemppi MASTERTIG AC/DC 2000 Operation Instructions Manual - 2.10. Shield Gas
Mastertig AC/DC 2000, 2500, 2500W, 3500W/0510 – 11
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KEMPPI
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2.10. SHIELD GAS
Handle gas bottle with care. There is a risk for injury if gas bottle or bottle valve
is damaged!
Argon, argon-helium or helium gases are normally used as shield gas. Check that the gas bottle
valve is suitable for the gas. The flow rate is set according to the welding power used in the job.
A suitable flow rate is normally 8 - 10 l/min. If the gas flow is not suitable, the welded joint will
be sporous. Contact your local Kemppi-dealer for choosing gas and equipment.
The following installing instructions are valid for most of the gas flow regulator types:
1. Step aside and open the bottle valve (A) for a while to blow out possible impurities from
the bottle valve.
2. Turn the press regulation screw (B) of the regulator until no spring pressure can be felt.
3. Close needle valve, if there is one in the regulator.
4. Install the regulator on bottle valve and tighten connecting nut (C) with a wrench.
5. Install hose spindle (D) and jacket nut (E) into gas hose and tighten with hose clamp.
6. Connect the hose with the regulator and the other end with the wire feed unit.
Tighten the jacket nut.
7. Open bottle valve slowly. Gas bottle pressure meter (F) shows the bottle pressure.
Note! Do not use the whole contents of the bottle. The bottle should be filled when the
bottle pressure is 2 bar.
8. Open needle valve if there is one in the regulator.
9. Turn regulation screw (B) until hose pressure meter (G) shows the required flow
(or pressure). When regulating flow amount, the power source should be in switched on and
the gun switch pressed simultaniously.
Close bottle valve after having finished welding. If the machine will be out of use for a long
time, unscrew the pressure regulation screw.
2.10.1. Installing gas bottle
Always fasten gas bottle properly in vertical position in a special holder on the
wall or on a carriage. Remember to close gas bottle valve after having finished
welding.
Parts of gas flow regulator
A Gas bottle valve
B Press regulation screw
C Connecting nut
D Hose spindle
E Jacket nut
F Gas bottle pressure meter
G Gas hose pressure meter
F