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Kemppi A7 TIG Orbital System 300 Manual

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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.
… 57 …


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