69
STEL s.r.l.
– Via del Progresso n° 59 – 36020
Loc. Castegnero (VICENZA) - ITALY
TEL. +39 0444 639525 (central.) – +39 0444 639682 (comm.)
FAX +39 0444 639641 – E-mail: stel @ stelgroup.it
http: www.stelgroup.it
MAX 503 & MAX 503 IP44
COD. 6914500030
FIGURES
ENGLISH
7.0
7.0
7.0
7.0 ---- WELDING DEFECTS AND MALFUNCTIONS
WELDING DEFECTS AND MALFUNCTIONS
WELDING DEFECTS AND MALFUNCTIONS
WELDING DEFECTS AND MALFUNCTIONS
7.1
7.1
7.1
7.1 ---- POSSIBLE WELDING DEFECTS
POSSIBLE WELDING DEFECTS
POSSIBLE WELDING DEFECTS
POSSIBLE WELDING DEFECTS
DEFECT
CAUSES
ADVICE
CRACKS
Material to be welded is dirty (e.g.. oil,
paint, rust, oxides).
Insufficient current.
Cleaning the parts before welding is a
fundamental principle for obtaining good
welding seams.
POROSITY
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.
Use a basic electrode.
Move the edges to be welded closer
together.
Advance slowly at the start.
Decrease the welding current.
POOR PENETRATION
Low current.
High welding speed.
Inverted polarity .
Electrode tilted in position opposite its
movement.
Regulate the operative parameters and
improve preparation of the parts to be
welded.
HIGH SPLASHING
Excessive electrode inclination.
Make the necessary corrections.
PROFILE DEFECTS
Incorrect welding parameters.
Passing speed not linked with the needs
of the operative parameters.
Electrode inclination not constant during
welding.
Respect the basic and general welding
principles.
ARC INSTABILITY
Insufficient current.
Check the state of the electrode and the
connection of the earth cable.
THE ELECTRODE MELTS OBLIQUELY Electrode with core not centred.
Magnetic blowing phenomenon.
Change the electrode.
Connect two earth cables to the opposite
sides of the part to be welded.
7.2
7.2
7.2
7.2 ---- POSSIBLE MALFU
POSSIBLE MALFU
POSSIBLE MALFU
POSSIBLE MALFUNCTIONS
NCTIONS
NCTIONS
NCTIONS
PROBLEM
CAUSES
REMEDY
DOES NOT SWITCH ON
-Incorrect primary connection.
-Faulty inverter card.
-Check the primary connection.
-Apply to the nearest service centre.
NO VOLTAGE AT OUTPUT
-Machine overheated (yellow led flashing).
-Faulty inverter card.
-Low primary voltage.
-Wait for thermal reset.
-Apply to the nearest service centre.
INCORRECT OUTPUT CURRENT
-Faulty regulating potentiometer.
-Low primary voltage.
-Apply to the nearest service centre.
-Check the distribution mains.