Maintenance Information - pei-POINT INVERTER AS25-13K Manual De Instruccion

3.8.1 HOW TO ELIMINATE WELDING DEFECTS
DEFECT
Squirts of melted material
The mark on the welded pieces is too
pronounced
Spot strength is not good enough
Deformed electrodes
Craters in the welding core
4.
4.1

MAINTENANCE INFORMATION

Maintenance personnel must be qualified, know the welding machine and work without modifying the safety of the product.
The maintenance person must also respect the general accident prevention rules and regulations.
Small maintenance jobs
Use a fine grain file to keep the electrode tips free from ferrous waste and from the small craters that form.
Restore electrode diameter to its original size because welding tends to widen it.
4.2 GUIDE TO MAINTENANCE
Daily checks
clean surfaces that are dirty with oil, grease and water
clean the area around the welding machine
clean any transparent guards
make sure that all the protection devices are in their place and working properly
Attention: do not squirt jets of water on the welding machine
do not use solvents to clean the painted parts
Electrical system and welding control unit
check condition of the protection circuit and tightness of the "PE" terminal
check condition of the electric contacts (microswitches)
check condition of the setting keypads/potentiometers
see if there is any noise coming from secondary connections that have not been fixed properly
check that all the signalling lights are in proper working order
INVERTER AS25-13K AS25-15K "R3.2"
CAUSE
• Squeeze time is too short
• Force on the electrodes is too weak
• Welding current is too high
• Insufficient contact of the electrodes
• Electrodes' diameter is insufficient
• Force on the electrodes is too strong
• Welding current is too high
• Welding time too long
• Weld time is too short
• Current is too weak
• Electrodes' diameter is too big
• Excessive force on the electrodes
• Secondary circuit contacts are dirty
• Weld time is too long
• Excessive force on the electrodes
• Excessive current
• Insufficient contact area
• The electrodes' copper alloy is too
weak
• Holding time is too short
• Insufficient electrodes force
Material is dirty
MAINTENANCE INSTRUCTIONS
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Resistance Welding Solutions
REMEDY
• Increase squeeze time
• Increase force on the electrodes
• Reduce welding current
• Change the electrodes with ones of a
suitable diameter
• Reduce pressure
• Reduce welding power (time and current)
• Increase weld time
• Increase welding current
• Reduce electrode diameter
• Reduce electrode force
• Clean the secondary circuit