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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.

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Drawbacks

The work on this machine is bit tiresome and dingy.

The process is bit time consuming.

Is less accurate than the robotic inspection.