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15
8 4. Reasons and remedy for defects of CO2 welding
‐
type
Main reason
Remedy
1. Blow holes
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
in
welding
part
6)Nozzle
diameter
is
too
small
Arc Is too long
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
2m/s
or
more
Remove
spatter from the nozzle
4)Use gas of welding purpose
5)Clean the welding area
Remove
feed oil from roller and wire
6)Select proper nozzle diameter
7)Lower voltage
2. Under cut
1)Wrong grounding location
2)Welding speed is too fast
3)Arc length is long
4)Welding current Is too much
1)Ground onto the first location
2)Slower the welding speed
3)Keep arc length short
4)Select proper welding current
3. Over lap
1)Too
low
arc
voltage
comparing
to welding current
2)Welding speed is low
1)Raise arc voltage
2)speed up the welding speed
3. Curve bead
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)Adjust
control
screw
of
pressurizing lever
2)More than 10 15 times of wire
‐
diameter
3)Adjust mounting angle in order
to
go
into
the
wire
guide
directly
4)Straighten wire
5)Replace contact tip angle
3. Crack
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)Set
proper
condition
(Raise
voltage, slow speed)
2)Increase
wire
approaching
angle
3) Preheating and after heating
‐
Treatment
4)Use gas of welding purpose 5}
Treat with crater
(add up enough deposition metal)
Summary of Contents for 350C
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