YASKAWA YWE-EH500-6N0 Instruction Manual page 76

9.2 Cause and Remedy of Welding Section Failure
Fault
Arc is Power supply voltage exces-
unstable. sively fluctuates.
Chip hole diameter becomes
larger and worn.
Welding wire is not fed
smoothly.
Voltage between phases of the
3-phase power supply is not
balanced.
The welding conditions are not
correct.
Unstable arc tends to occur
when thin-plate or small-current
welding is performed only with
carbon dioxide gas.
The connecting section is
loose.
Voltage drop is excessive with
the extension cable.
The polarities of the secondary
terminal are inverted.
Jig current conduction is poor.
Excessive The welding conditions are not
spatters correct.
Welding wire is not suitable for
the shielding gas.
The status of the base metal is
poor.
The welding section is dis-
torted.
Table. 12 Failure Analyses for Welding Section
Cause
Use a different power supply from that of other
machines that cause power supply voltage fluctua-
tion. Or increase the power supply transformer
capacity.
Replace the chip. (Use a genuine chip.)
Remove the dust or iron powder choking up the
feeding roller section or conduit.
Check that the conduit is not excessively bent and
that the liner, contact tip, and feeding roller match
the wire diameter.
Use a different power supply from that of other
machines that cause the imbalance. Or increase
the power supply transformer capacity.
Use the test arc to increase or decrease the set-
tings of the welding current value and voltage
value.
Use gas mixed with carbon dioxide gas and argon
gas to improve the arc behavior.
Check each terminal connection and the connec-
tions with the base metal. Securely re-tighten if
necessary.
Shorten the extension cable's length.
Use a thicker cable. Use the extension cable with-
out bending it.
Correct the connection of + and -.
Correct the contact between the jig and the base
metal.
Increase or decrease the settings of the welding
voltage and current values to adjust the welding
conditions.
Check if a welding wire suitable for the welding
type is used.
Check the groove forms or dirt of the base metal.
Replace them with one of higher accuracy.
Check each terminal connection and the connec-
tions with base metal. Polish the contacting face
and tighten them securely.
9-4
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Remedy
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