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Study of Magna Flux Machine
Non Destructive Test forDetecting Cracks.
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Knowing the Magna Flux Machine
Purpose of Megna Flux Machine.
Materials Required for test on this Machine.
Method of Detecting Cracks.
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Purpose of Magna Flux
This machine is used in non destructive tests .
Megna Flux is used to detect cracks.
Shafts, crank shaft etc. are tested for cracks which is
necessary for healthy production.
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Requirement for Conducting Test
Machine is to be operated in dark, behind the thick black curtains
A paste is required for the application on the surface
of the material which is to be detected for cracks.Ingredients of the paste are-
• Kerosene
• Magneaglo MG40
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M a g n a f l u x m
a c h i n e
Picture showing magna
flux machine . It is
covered with black
curtains.
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Preparation of Paste
Paste consists of kerosene oil, which works as a base
and Magneaglo MG40 which is in powder form.
These two are mixed in required proportion. Best
results are obtained when 0.75g of Mg40 is mixed
with 1litre of kerosene oil.
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Working of Magna FluxMachine
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Step1
First of all the specimen like shaft, crank etc. whichis to be tested for the cracks is mounted on the
rotating spindle of the machine.
Machine is turned on and the material to be tested
starts rotating.
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Step 2
Now the paste is applied on the surface of thespecimen while rotating.
Ultra violet light is turned on.
Also magnetic field of machine is turned on.
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Step 3
As the magnetic field is applied to the surrounding of
the specimen the material of specimen gets
magnetised.
Due to magnetisation the shaft or crank surface
expands very minutely.
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Step 4
As the surface of the material expands, cracks if any
on surface also expands.
Due to expansion of cracks the paste being appliedon the surface of the material enters into the cracks.
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Step 5
Now in final step the ultra violet rays are focused onthe surface of turning material.
Surface is inspected visually with naked eye.
If any crack is present in the material the pasteentered into the crack is seen in a bright yellowcolour in thread like structure under UV rays.
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Picture showing cracks .
This is how the crack
appears when UV rays are
focused
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Conclusion
So the appearance of the yellow thread like structureconcludes that the crack is present in the shaft andthis must not be used in the production.
Thus the material is not passed and if large number of shafts are found defected, quality department isinformed, which further informs the vendor andwhole supply is returned with warning for supply of
good material in future.
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Benefits
The operation of machine is not very complicatedand operator can be trained in short duration.
The use of machine is cheap as compared to the
robotic inspection of cracks.
Accurate upto required level.