9.2 Cause and Remedy of Welding Section Failure
9-5
HW0480311
HW0480311
Bead form
is bad and
the appear-
ance is
poor.
Manipulation of electrode is not
correct.
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.
The shielding gas has a prob-
lem.
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.
The welding conditions are not
correct.
Increase or decrease the settings of the welding
voltage or current value a little.
Arc-start is
poor.
Welding current conduction is
not perfect.
Check the connections and the current conduction
contacting section of the base metal to confirm the
current conduction.
The connection cable is too
thin.
Replace the cables at the 3-phase input side and
base metal side with those of sufficient thickness.
The welding conditions are not
correct.
Check that the welding voltage set value is not too
small or that the wire feeding speed set value is
not too large.
The status of the base metal is
poor.
Check that dirt or insulating material does not
adhere to the base metal or slugs do not remain
on it.
The welding torch operations
are not correct.
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.
The power cable is wired with
the cable being winded.
Wire the power cable as straight as possible.
Burnback
occurs.
(The weld-
ing wire
sticks to the
end of the
contact tip.)
The welding torch operations
are not correct.
The wire stickout of the welding wire is too short.
Extend it a little. Change the welding torch angle.
The welding conditions are not
correct.
Check that the welding voltage set value is not too
large or that the wire feeding set value is not too
small.
Contact tips are defective.
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.
Welding current conduction is
not perfect.
Check the connections and the current conduction
contacting section of the base metal to confirm the
current conduction.
The welding wire almost buck-
les.
Pull the welding wire from the inside of the conduit
and pass the welding wire again through the con-
duit.
Table. 12 Failure Analyses for Welding Section
Fault
Cause
Remedy
77/129
