Bedienungsanleitung Kemppi A7 TIG Orbital System 300 (Seite 57 von 61) (Englisch)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

6.3.5 Water cooler maintenance/flushing

procedure for the torch cable

• Flush the radiator-type water cooler used with

this system periodically.

• Use algaecide to prevent growth occurring in the

tank (in areas, where this is found problematic).

You can usually remove a blockage by reversing the inlet

and outlet ttings of the torch cable and ushing the torch

cable. The normal ow rate of water through a new torch

cable is 0.6 l/min.

If reservoir water temperature is higher than normal or the

body of the weld head feels hotter than normal, the water

ow through the torch cable may have diminished. This

may happen if algal growth has occurred in the reservoir

or in some cases where the local water supply has an

excess of soluble minerals. In severe cases:

• Return the torch cable to the service for

replacement of the hoses.

6.3.6 Maintenance of torch components

• The torch is designed to accept standard

expendable parts.

• The collet bodies, collets and gas cups are

expendable components that must be

periodically inspected and replaced.

• For proper operation of the Arc Gap Control

System (AGC), the tungsten electrode must be

gripped tightly within the torch.

When installing the tungsten electrode, tighten the

collet body "snug" with the back-cap or a collet wrench.

Excessive tightening will deform the collet, ultimately

resulting in a poor contact between the tungsten and the

collet.

• If the collet is deformed, replace it.

• Use a gas-lens-type collet body for all

applications permitting the greater size gas cup

as compared with the split-type collet bodies.

• The gas-lens-type collet bodies give better

gas coverage of the weld, especially in drafty

situations as compared to the spud type.

If weld spatter or oily residue locks the ne mesh screens

of the gas-lens collet body, replace the collet body.

Symptoms of a blocked collet body:

• weld porosity

• blackening of the tungsten or weld surface

• erratic AGC movement.

1. Thread up the ceramic gas cup over the collet body

until it seats on the rubber surface of the torch

body.

If the gas cup is not seated completely, this can result in

aspiration of oxygen into the shielding gas and subsequent

porosity in the weld. If weld spatter prevents easy threading

of the gas cup, replace it.

When the torch back-cap cannot be used, use the collet

wrench supplied in the tool kit to tighten the collet body.

Finger-tight installation of the collet body is not enough for

good electrical contact.

2. Use the collet body supplied as part of the tool

kit (included in the weld head package) at all

times when installing a tungsten electrode. Some

manufacturers of collet bodies have removed the

wrenching ats from the standard gas-lens collet

bodies. If this is the case, you can purchase collet

bodies with wrenching ats from Kemppi.

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