Operation Disturbances - Kemppi 25 Operating Manual

9.

OPeraTiOn disTurBanCes

welding is stopped and the pilot lamp of thermal shield of the
Promig unit is lit:
• Thermal shield of the gun has stopped welding. Find the fault before
you continue welding. Especially check connections of the cooling liquid
hoses (also in the interconnecting cable).
start does not operate although you pull the trigger, or start is
always switched on, although you do not pull the trigger:
• Internal connection of the gun is in position "PRO" although you are
using the gun in a wire feeder other than Promig or Feed. Change
connection according to the instructions.
• RMT 10 gun control unit is coupled, although you use gun in other units
than Promig or Feed. Detach the gun control unit.
welding wire does not run smoothly or wire is sticking in the wire
liner (arc length varies, you can feel shaking in the handle):
• Wire liner is dirty or blocked-up. Clean with compressed air. Replace if
necessary.
• Wrong wire liner or contact tip. Make sure that the wire liner and contact
tip are according to recommendations for the welding wire in use (see
the consumable parts sheet delivered with the gun).
• The contact tip has heated up too much. Check the cooling liquid
circulation.
• The contact face of the contact tip is damaged due to spatter or sparking
caused by impurities. Replace contact tip.
• The gun cable has sharp bends, straighten.
• The welding wire has a lot of dirt, rust or bends etc., which increases
friction and results in contact disturbances.
• Check operation of the wire feed unit. Check that the drive roll size and
type are suitable for the wire in use. Check that the drive roll pressure is
not too low or too high.
gas shielding is bad (weld pool "is boiling", arc is unstable):
• There is too much welding spatter on the inner face of the gas nozzle or
in the contact tip and the contact tip holder; clean.
• There is spatter or other dirt in the discharge hole for shielding gas;
clean.
• There are impurities in the shielding gas (moisture, air).
• There are impurities in the base material (rust, base coat, grease).
EN
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