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Defect
Reasons
Incomplete
The welding thermal input is too low.
fusion
There is rust and dust on the side of the
groove.
The slag between the layers is not cleared
well.
Overlap
The temperature of the molten pool is too
high.
The liquid metal solidifies slowly.
Hot crack.
In the process of solidification, internal
crystal segregation is caused. At the same
time, with the effect of welding stress, a hot
crack is formed.
Cold crack.
Three reasons will cause a cold crack:
The structure forms martensite, which are
brittle, micro-cracks.
The residual stress is caused by big
restraint intensity.
There is residual hydrogen in the welding
gap.
Blowhole
There are some impurities such as dust, oil,
rust or water on the workpiece surface and
groove.
The coating of the electrode is damp.
Current is too low or speed is too great in
the welding.
The arc is too long, the current is too low or
the molten pool protection is inadequate.
The current is too high, the coating of the
electrode has fallen off and there is
inadequate shielding gas.
The electrode is not the proper type.
Inclusion and
The slag does not clear properly in the
slag inclusion.
middle layer in the welding process.
Current is too low or welding speed is too
slow.
The welding electrode is wrong for the
workpiece material.
The groove design and processing are not
proper.
20
SMART TIG AC/DC-200P Inverter Welding Machine
Preventative Methods
Chose the welding parameters correctly.
Clean the workpiece before beginning the weld.
Clear the layers better to prevent contamination.
Chose parameters based on the welding different
position.
Carefully control the molten hole size.
Strictly control the percentage of impurities in the
welding material.
Adjust the structure of welding material.
Use a basic electrode.
Consult welding manual to determine temperatures
to bake workpiece before and after welding to
prevent martensite from forming.
Remove the fouled or impure matter before use,
reduce the percentage of hydrogen.
Use appropriate parameters and heat input.
Adopt a low hydrogen type of
basic electrode. After welding, perform
dehydrogenation at once.
Clear out the impurities around the groove for about
20 to 30 mm.
Take care to dry the electrode
Adjust the welding current or the electrode's travel
speed.
Reduce the arc length, adjust the current or improve
welding techniques to create a molten pool.
Replace the electrode with an undamaged one.
Reduce the welding current based on the type of
electrode and welding task.
Do not use improper electrodes.
Select the electrode with good slag detachability.
Make sure to clear the slag in the layers.
Select the correct welding current and speed of
travel with the electrode.
Choose an electrode appropriate for the welding
task.
Adjust the electrode angle and the manipulation
method.
For technical questions call 1-800-665-8685
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