YASKAWA YWE-EH500-6N0 Instruction Manual page 77

HW0480311
Fault
Bead form Manipulation of electrode is not
is bad and correct.
the appear-
ance is
poor.
The shielding gas has a prob-
lem.
The welding conditions are not
correct.
Arc-start is Welding current conduction is
poor. not perfect.
The connection cable is too
thin.
The welding conditions are not
correct.
The status of the base metal is
poor.
The welding torch operations
are not correct.
The power cable is wired with
the cable being winded.
Burnback The welding torch operations
occurs. are not correct.
(The weld-
The welding conditions are not
ing wire
correct.
sticks to the
end of the
contact tip.)
Contact tips are defective.
Welding current conduction is
not perfect.
The welding wire almost buck-
les.
9.2 Cause and Remedy of Welding Section Failure
Table. 12 Failure Analyses for Welding Section
Cause
Change the welding torch angle a little. Employ
the forward welding method and practice so that
welding torch can constantly aim at a target. Or
change the welding speed.
Since the gas flow amount is not sufficient, let the
gas flow 10 to 25 litters per minute, and mix argon
gas if necessary. Or use a gas of better quality.
Increase or decrease the settings of the welding
voltage or current value a little.
Check the connections and the current conduction
contacting section of the base metal to confirm the
current conduction.
Replace the cables at the 3-phase input side and
base metal side with those of sufficient thickness.
Check that the welding voltage set value is not too
small or that the wire feeding speed set value is
not too large.
Check that dirt or insulating material does not
adhere to the base metal or slugs do not remain
on it.
The wire stickout of the welding wire is too long.
Shorten it a little. Change the welding torch angle.
Or slow down the welding speed.
Wire the power cable as straight as possible.
The wire stickout of the welding wire is too short.
Extend it a little. Change the welding torch angle.
Check that the welding voltage set value is not too
large or that the wire feeding set value is not too
small.
Check that the contact tip hole is worn and its
inner diameter has become too big. Also check for
defect on the tip inner side.
Check the connections and the current conduction
contacting section of the base metal to confirm the
current conduction.
Pull the welding wire from the inside of the conduit
and pass the welding wire again through the con-
duit.
9-5
Remedy
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