SMART PRO 5.0 Pág. 34
falls off and lose protection
Manipulation of electrode is not
proper
Inclusion &
slag
inclusion
The slag clears bad in the middle
layer in the welding process
Under current or over speed in the
welding
Welding operation is not proper
The welding material can not match
the work piece
The groove design & processing are
not proper
Choosing the electrode of good slag
detachability
Strictly to clear the slag in the layers
Correctly to choose the welding
parameters
Adjusting the electrode angle and
manipulation way
Hot crack
In the process of solidification, the
inter crystal segregation is seriously
caused. At the same time, with the
effect of welding stress, the hot crack
is formed.
Strictly control the percentage of S and
P in welding material.
Adjust the structure of welding material.
Adopt the basic electrode.
Cold crack
Three reasons will cause cold crack:
The structure turned from the marten
site
The residual stress caused by big
restraint intensity
The residual hydrogen in welding gap.
Adopt
low
hydrogen
type
basic
electrode.
Bake under the instruction before use.
Remove the feculence before use,
reduce the percentage of hydrogen
Adopt appropriate parameters and heat
input
After welding, do dehydrogenation at
once.
4.6 Operation Environment
●
Height above sea level is below 1000m.
●
Operation temperature range:-10
0
C
～
+40
0
C.
●
Relative humidity is below 90 %(+20
0
C).
●
Preferably site the machine some angles above the floor level, the maximum angle does not exceed 15
0
.
●
Protect the machine against heavy rain or in hot circumstance against direct sunshine.
●
The content of dust, acid, corrosive gas in the surrounding air or substance can not exceed normal
standard.
●
Take care that there is sufficient ventilation during welding. There is at least 30cm free distance between
the machine and wall.
4.7 Operation Notices
●
Read §1 carefully before attempting to use this equipment.
●
Connect the ground wire with the machine directly
●
In case closing the power switch, no-load voltage may be exported. Do not touch the output electrode with
any part of your body.
●
Before operation, no concerned people should be left. Do not watch the arc in unprotected eyes.
●
Ensure good ventilation of the machine to improve duty ratio.
●
Turn off the engine when the operation finished to economize energy sources.
●
When power switch shuts off protectively because of failure. Don’t restart it until problem is resolved.
Otherwise, the range of problem will be extended.
