List the main human factors that affect the probability of detection in liquid p

Question

List the main human factors that affect the probability of detection in liquid penetrant testing. (20 marks)

What control measures should be considered in developer thickness layer? (20 marks)

List the advantages and disadvantages of the various developer types. (20 marks)

Additionally there are 10 marks given for organisation and presentation. You will be expected to show evidence of research and well balanced arguments supported by academic literature relevant to the problem (in addition to the learning package material). Note that that the marking scheme gives an indication of the expected length of each section. Explanations and descriptions should reflect this balance between sections and sub-sections.

Explanation / Answer

The developer is allowed to stand on the part surface for the sufficient period of time to permit the extraction of the trapped penetrant out of any surface flaws.

The time of development must be minimum of 10 minutes as this will help in tightening the crack.

Inspection is also very necessary to performed under the appropriate lighting. This is necessary to detect the indication from any flaws that may be present.

Clean surface is also an important measure as it is found to be acceptable.

Advantage:

A highly sensitive method.

Material limitations are less.

Rapid inspection is possible of large area and volume

It is portable and has low cost.

Disadvantage:

This is limited to surface breaking defects.

Multiple process operation must be performed and controlled

Post cleaning of acceptable parts or materials is required.

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