Welding Defects And Malfunctions; Possible Welding Defects; Possible Malfunctions - Stel TIG μP 353H DC Manual De Instrucciones

ENGLISH
TIG µP 353H DC
COD. 6903700030

8.0-WELDING DEFECTS AND MALFUNCTIONS

8.1- POSSIBLE WELDING DEFECTS

DEFECT
Acid electrode on steel with a high sulphur
POROSITY
content.
Excessive swinging of the electrode.
Distance between the parts to be welded is
too great.
Part being welded is cold.
CRACKS Material to be welded is dirty (e.g. oil, paint,
rust, oxides).
Insufficient current.
POOR PENETRATION Low current.
High welding speed.
Inverted polarity.
Electrode tilted in position opposite its
movement.
HIGH SPLASHING Excessive electrode inclination.
PROFILE DEFECTS Incorrect welding parameters.
Passing speed not linked with the needs of
the operative parameters.
Electrode inclination not constant during
welding.
ARC INSTABILITY Insufficient current.
THE ELECTRODE MELTS OBLIQUELY Electrode with core not centred.
Magnetic blowing phenomenon.

8.2- POSSIBLE MALFUNCTIONS

PROBLEM
DOES NOT SWITCH ON -Incorrect primary connection.
-Faulty inverter card.
NO VOLTAGE AT OUTPUT -Machine overheated (yellow led lit ).
-Primary feeding voltage outside maxi-
mum and minimum limits.
-Faulty inverter card
INCORRECT OUTPUT CURRENT -Faulty regulating potentiometer.
-Primary feeding voltage too low.
STEL s.r.l. – Via del Progresso n° 59 – 36020
Loc. Castegnero (VICENZA) - ITALY
TEL. +39 444 639525 (central.) – +39 444 639682 (comm.)
FAX +39 444 639641 – E-mail:stelgroup.com
http: www.stelgroup.it
TROUBLESHOOTING
CAUSES ADVICE
Use a basic electrode.
Move the edges to be welded closer to-
gether.
Advance slowly at the start.
Decrease the welding current
Cleaning the parts before welding is a
fundamental principle for obtaining good
welding seams.
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.
CAUSES REMEDY
-Check the primary connection.
-Apply to the nearest service centre.
-Wait for thermal reset.
-Check the distribution mains.
-Apply to the nearest service centre
-Apply to the nearest service centre.
-Check the distribution mains.
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ENGLISH
8.0-WELDING DEFECTS AND MALFUNCTIONS
8.1- POSSIBLE WELDING DEFECTS
DEFECT
POROSITY
CRACKS
POOR PENETRATION
HIGH SPLASHING
PROFILE DEFECTS
ARC INSTABILITY
THE ELECTRODE MELTS OBLIQUELY
8.2- POSSIBLE MALFUNCTIONS
PROBLEM
DOES NOT SWITCH ON
NO VOLTAGE AT OUTPUT
INCORRECT OUTPUT CURRENT
STEL s.r.l. – Via del Progresso n° 59 – 36020
Loc. Castegnero (VICENZA) - ITALY
TEL. +39 444 639525 (central.) – +39 444 639682 (comm.)
FAX +39 444 639641 – E-mail:stelgroup.com
71 http: www.stelgroup.it
TIG µP 353H DC
TROUBLESHOOTING
COD. 6903700030
CAUSES
Acid electrode on steel with a high sulphur Use a basic electrode.
content.
Excessive swinging of the electrode. Move the edges to be welded closer to-
Distance between the parts to be welded is gether.
too great. Advance slowly at the start.
Part being welded is cold. Decrease the welding current
Material to be welded is dirty (e.g. oil, paint, Cleaning the parts before welding is a
rust, oxides). fundamental principle for obtaining good
Insufficient current. welding seams.
Low current. Regulate the operative parameters and
improve preparation of the parts to be
High welding speed. welded.
Inverted polarity.
Electrode tilted in position opposite its
movement.
Excessive electrode inclination. Make the necessary corrections.
Incorrect welding parameters. Respect the basic and general welding
principles.
Passing speed not linked with the needs of
the operative parameters.
Electrode inclination not constant during
welding.
Insufficient current. Check the state of the electrode and the
connection of the earth cable.
Electrode with core not centred. Change the electrode.
Magnetic blowing phenomenon. Connect two earth cables to the opposite
sides of the part to be welded.
CAUSES
-Incorrect primary connection. -Check the primary connection.
-Faulty inverter card. -Apply to the nearest service centre.
-Machine overheated (yellow led lit ). -Wait for thermal reset.
-Primary feeding voltage outside maxi- -Check the distribution mains.
mum and minimum limits. -Apply to the nearest service centre
-Faulty inverter card
-Faulty regulating potentiometer. -Apply to the nearest service centre.
-Primary feeding voltage too low. -Check the distribution mains.
?
ADVICE
REMEDY
71