Kemppi MF 33 User Manual download pdf (Page 12)

3.9 Shield gas

NOTE! Handle gas bottle with care. There is a risk for injury if gas bottle or bottle valve is damaged!

For welding stainless steels, mixed gases are normally used. Check that the gas bottle valve

is suitable for the gas. The ow rate is set according to the welding power used in the job. A

suitable ow rate is normally 8 – 10 l/min. If the gas ow is not suitable, the welded joint will

be sporous. Contact your local Kemppi-dealer for choosing gas and equipment.

3.9.1 Installing gas bottle

NOTE! 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 nished welding.

Parts of gas ow regulator

A. Gas bottle valve

B. Press regulation screw

C. Connecting nut

D. Hose spindle

E. Jacket nut

F. Gas hose pressure meter

The following installing instructions are valid for most of the gas ow 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 lled 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 ow (or

pressure). When regulating ow amount, the power source should be in switched on and

the gun switch pressed simultaneously.

NOTE! Close bottle valve after having nished welding. If the machine will be out of use for a long

time, unscrew the pressure regulation screw.

FastMig MF 33

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Kemppi MF 33 User Manual Page 12