Welding Defects And Malfunctions; Possible Welding Defects; Possible Malfunctions - Stel HI-MIG 353/503S-P 400V 3F Manual De Instrucciones

ENGLISH

7.0 WELDING DEFECTS AND MALFUNCTIONS

7.1- POSSIBLE WELDING DEFECTS

DEFECT
CRACKS
POROSITY
POOR PENETRATION
HIGH SPLASHING
PROFILE DEFECTS
ARC INSTABILITY
THE ELECTRODE MELTS OBLIQUELY Electrode with core not centred.

7.2- POSSIBLE MALFUNCTIONS

PROBLEM
DOES NOT SWITCH ON
NO VOLTAGE AT OUTPUT
INCORRECT OUTPUT CURRENT
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Loc. Castegnero (VICENZA) - ITALY
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HI-MIG 353/503S-P 400V 3F
COD. 6907900030
CAUSES
Material to be welded is dirty (e.g.. oil,
paint, rust, oxides).
Insufficient current.
Acid electrode on steel with a high sulphur
content.
Excessive swinging of the electrode.
Distance between the parts to be welded
is too great.
Part being welded is cold.
Low current.
High welding speed.
Inverted polarity .
Electrode tilted in position opposite its
movement.
Excessive electrode inclination.
Incorrect welding parameters.
Passing speed not linked with the needs
of the operative parameters.
Electrode inclination not constant during
welding.
Insufficient current.
Magnetic blowing phenomenon.
CAUSES
-Incorrect primary connection.
-Faulty inverter card.
-Machine overheated (yellow led flashing).
-Faulty inverter card.
-Low primary voltage.
-Faulty regulating potentiometer.
-Low primary voltage.
TROUBLESHOOTING
ADVICE
Cleaning the parts before welding is a
fundamental principle for obtaining good
welding seams.
Use a basic electrode.
Move the edges to be welded closer to-
gether.
Advance slowly at the start.
Decrease the welding current.
Regulate the operative parameters and
improve preparation of the parts to be
welded.
Make the necessary corrections.
Respect the basic and general welding
principles.
Check the state of the electrode and the
connection of the earth cable.
Change the electrode.
Connect two earth cables to the opposite
sides of the part to be welded.
REMEDY
-Check the primary connection.
-Apply to the nearest service centre.
-Wait for thermal reset.
-Apply to the nearest service centre.
-Apply to the nearest service centre.
-Check the distribution mains.
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