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8 4. Reasons and remedy for defects of CO2 welding
type
1. Blow holes
2. Under cut
3. Over lap
3. Curve bead
3. Crack
Main reason
1)No feed gas comes out
2)Air mixed in feed gas
3)Insufficient coating effect due
to strong wind
4)Carbon dioxide soaked in
5)Foreign
material
part
6)Nozzle
diameter
Arc Is too long
1)Wrong grounding location
2)Welding speed is too fast
3)Arc length is long
4)Welding current Is too much
1)Too low arc voltage comparing
to welding current
2)Welding speed is low
1)wire pressurizing lever does not
work
2)Distance between tip and the base
metal is too far.
3)Tip mounting is not proper
4)Wire bent
5)Tip is worn out
1)Improper welding conditions (high
current, high speed)
2)Wire approaching angle is too
small
3)Too much containing of carbon and
other metals in the base metal
4)Too much moisture in gas
5)Quick electrical break of arc in
crater
1)Check the gas cylinder, valve
and pressure regulator
2)Check the connection part of
gas tube
3)Make measure for wind m wind
speed
in
welding
spatter from the nozzle
4)Use gas of welding purpose
is
too
small
5)Clean the welding area
feed oil from roller and wire
6)Select proper nozzle diameter
7)Lower voltage
1)Ground onto the first location
2)Slower the welding speed
3)Keep arc length short
4)Select proper welding current
1)Raise arc voltage
2)speed up the welding speed
1)Adjust
pressurizing lever
2)More than 10 15 times of wire
diameter
3)Adjust mounting angle in order
to
directly
4)Straighten wire
5)Replace contact tip angle
1)Set
voltage, slow speed)
2)Increase
angle
3) Preheating and after heating
Treatment
4)Use gas of welding purpose 5}
Treat with crater
(add up enough deposition metal)
15
Remedy
2m/s
or
more
control
screw
go
into
the
wire guide
proper
condition
wire
approaching
Remove
Remove
of
(Raise
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