Kemppi MF 29 - Manual (Page 12)

EN
3.9 Shielding gas
NOTE! Handle gas cylinder with care. There is a risk for injury if the cylinder or its valve is damaged!
For welding stainless steels, mixed gases are normally used. Check that the gas cylinder 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.
3.9.1 Installing gas cylinder
NOTE! Always fasten gas cylinder properly in vertical position in a special holder on the wall or on a
carriage. Remember to close gas cylinder valve after having finished welding.
Parts of gas flow regulator
E
B
D
G
A F
C
A. Gas cylinder valve
B. Press regulation screw
C. Connecting nut
D. Hose spindle
E. Jacket nut
F. Gas cylinder pressure meter
G. Gas hose pressure meter
The following installing instructions are valid for most of the gas flow regulator types:
1. Step aside and open the cylinder valve (A) for a while to blow out possible impurities
from the cylinder 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 cylinder 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 cylinder valve slowly. Gas cylinder pressure meter (F) shows the cylinder pressure.
Note! Do not use the whole contents of the cylinder. The cylinder should be filled when
the cylinder 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 simultaneously.
Close cylinder valve after having finished welding. If the machine will be out of use for a long
time, unscrew the pressure regulation screw.
FastMig MF 29
10