EN-8
8.0 POSSIBLE WELDING DEFECTS
DEFECT
CAUSES
SUGGESTIONS
POROSITY
Acid electrode on steel with high
sulphur content.
Electrode oscillates too much.
Workpieces are too far apart.
Workpiece being welded is cold.
Use basic electrodes.
Move edges to be welded closer
together.
Move slowly at the beginning.
Lower welding current.
CRACKS
Material to be welded is dirty (e.g.
oil, paints, rust, oxides).
Not enough current.
Cleaning workpieces before
welding is an essetial method of
achieving neat weld beads.
LIMITED
PENETRATION
Low current.
High welding rate.
Reversed polarity.
Electrode inclined in position
opposite to its movement.
Make sure operating parameters
are regulated and improve prepa-
ration of workpieces.
HIGH SPRAYS
Electrode is too inclined.
Make appropriate corrections.
PROFILE DEFECTS
Welding parameters are incorrect.
Pass rate is not related to opera-
ting parameters requirements.
Follow basic and general welding
principles.
ARC INSTABILITY
Not enough current.
Check condition of electrode and
earth wire connection.
ELECTRODE MELTS
OBLIQUELY
Electrode core is not centered.
Magnetic blow phenomenon.
Replace electrode.
Connect two earth wires to opposi-
te sides of the workpiece.
INCONVENIENCE
CAUSE
REMEDY
SPARK WILL NOT
START
Bad primary connection.
Inverter PCB is defective.
Check primary connection.
Contact after sales service centre.
NO OUTPUT
VOLTAGE
Overheated unit, yellow LED lit
Internal relay has failed.
Inverter PCB is defective.
Wait for thermal cutout to be reset.
Check power line. Reset the unit
by turning it off and on after 20
seconds.
Contact after sales service centre.
Contact after sales service centre.
WRONG OUTPUT
CURRENT
Defective control potentiometer.
Low primary power supply
voltage.
Contact after sales service centre.
Check power line.
9.0 TROUBLE SHOOTING
