which may cause short-circuits and thus damage parts of the machine. Do not aim the jet of air at any PCB’s,
but remove the dust from these with a vacuum cleaner.
The power source must not be cleaned with water jets (for example high-pressure cleaners). Do not use sol-
vents, because these could damage protective coatings and plastic parts.
There must be no electrical link between the metal housing of the power source and the workpiece. Therefore
make sure that the insulating supporting legs are in perfect condition if the site of the power source has an elec-
trical link to the workpiece.
3.10 Maintenance of the Welding Gun
The welding gun is an electrical tool which must be kept perfectly insulated. If its body or cables are damaged,
work must be discontinued at once. Do not use water jets or solvents for cleaning the gun. Protect it from mois-
ture. If the gun does get wet, it must be completely dried before being used again.
Chucks and support legs (support tubes) are expendable parts and must be cleaned or replaced in case of
heavy scorching or contamination with splashes. The chuck must have sufficient clamping force to ensure trou-
ble-free current transmission. If, in spite of tightening the gripping jaws, its clamping force is no longer sufficient,
the chuck must be replaced. Typical signs for insufficient clamping force are scorched threading on threaded
studs or scorch marks on the top of studs caused by electric current flowing through the stop screw.
Keep in mind that the stud, the chuck and the clamping nut are all under voltage in relation to the workpiece
once the welding process has set in. Therefore keep a safe distance during welding from parts of the workpiece
where no welding is intended and from studs already welded.
3.11 Maintenance of Welding and Control Cables
The insulation of all cables, plugs and sockets must be kept in perfect condition. Due to the high currents in-
volved, it is necessary to ensure that all connections within the welding circuit are tight, otherwise scorching will
occur. Critical points are where parts of the cables are frequently moved, for instance cable entry points. Here,
the cable cross-section is gradually reduced by breakage of individual wires, which involves the risk of sudden
breakage and arcing over of the remaining cross-section. Therefore always check the cables and replace defec-
tive parts before starting work!
Protect the cables from moisture, especially at the connection points. When cleaning the cables, do not use
solvents or water jets.
3.12 Shut-down
After completing the welding work turn off the main switch. When there are longer interruptions to the welding
process the equipment should also be disconnected from the mains power supply (for instance by pulling the
plug out of the wall socket). Do not use the mains connection plug in lieu of a switch, i.e. the main switch must
always be turned off before the plug is pulled out.
3.13 Waste Disposal
Your KÖCO stud welding equipment contains valuable materials and must therefore not be disposed of together
with household waste or by any other uncontrolled method.
We are registered with the “Stiftung Elektro-Altgeräte Register ® (EAR)” (Registry of Disused Electrical Appli-
ances Foundation) under the registration number
WEEE-Reg.-Nr. DE 70903619
and will take back any appliance delivered by us from 2005 onwards free of charge for correct disposal in com-
pliance with the relevant legislation, if such appliances are delivered to us carriage free.
Issue 4/2019 ver. 2.0 page 20 of 42
Köster & Co. GmbH • D-58256 Ennepetal • Spreeler Weg 32 • Tel. +49 2333 8306-0 • Fax +49 2333 8306-38
Internet: http://www.koeco.net • E-Mail: koeco@koeco.net
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