Manual Kemppi A7 TIG Orbital System 300 (page 58 of 61) (English)

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A7 TIG Orbital System 300© Kemppi Oy 2016 1615

OPERATING MANUAL

6.3.7 Cleaning the weld head

Clean weld head periodically to maintain maximum

operating eciency. Keep the unit free of moisture, debris,

and other contaminants (oil, water, abrasives, etc.) that can

aect normal operation and weld consistency.

• Clean insulating components with a soft brush

and a fast drying solvent, such as acetone or

denatured alcohol.

• Clean drive gear assemblies using a ne wire

brush and solvent. Inspect the drive gear, bevel

gear, and rotor assembly to insure that debris

have not damaged the rotor sprocket lobes and

aected the operation of the drive assembly. Use

a ne jeweler’s le to repair.

• Clean the body with a cloth or soft brush and

solvent.

• Clean the collets with ne stainless steel wool or

ne wire brush.

Only use stainless steel, as regular carbon steel will ruin

the surface passivation. All parts must be completely dry

before reassembly.

6.3.8 Internal arcing

Dirt and impurities in the weld head may cause internal

arcing. This is a situation where the arc jumps from the

tungsten electrode to the collet frame and the welding arc

fails to ignite.

When internal arcing occurs, a track of carbon is left on the

dielectric material, which may cause the same problem to

occur again.

To prevent internal arcing, do the following:

• Periodically clean the weld head according to

instructions given above in section “Cleaning the

weld head”.

• Maintain the tungsten electrode in good working

condition at all times.

Remember that the collet frame and collets are connected

to the ground cable and act as the ground contact for the

electrical circuit.

If internal arcing does occur, do the following:

• Carefully scrape all burn marks from the plastic

body with a razor blade or other sharp scraping

tool.

• Remove all carbon and polish with a ne wire

brush.

• Remove all carbon o the collet frame and collets

with a ne wire brush.

• Remove the rotor gear and polish if necessary

with a ne wire brush to remove any traces of

arcing.

• Clean with alcohol or other suitable solvent and a

lint free cloth before reassembling.

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Kemppi A7 TIG Orbital System 300 Manual

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