FREE NDT Penetrant Testing Questions and Answers
Most materials can be tested with LPI as long as the part's surface is
"Is not extremely rough or porous."
Liquid Penetrant Inspection (LPI) works best on surfaces that are smooth and uniform. If a surface is extremely rough or porous, it may not allow the penetrant to adequately penetrate into defects or discontinuities, leading to inaccurate or unreliable results. Therefore, materials suitable for LPI should have surfaces that are relatively smooth and free from excessive roughness or porosity.
While utilizing a fluorescent penetrant, the part's surface should have a white light intensity of:
When utilizing a fluorescent penetrant, it's important to control the intensity of the white light to ensure optimal fluorescence contrast. The white light intensity should typically be kept below 2 foot-candles to prevent the white light from overwhelming the fluorescence emitted by the penetrant. This helps to enhance the visibility of indications or defects during inspection processes.
Water soluble developers are made up of the following chemical compounds:
Water-soluble developers are formulated with chemical compounds that are capable of being dissolved in water. This allows for the creation of a developer solution that can be applied to the surface being inspected. The developer solution helps to draw penetrant out of defects and provides a contrasting background for better indication visibility during liquid penetrant inspection processes.
When using a water suspendible developer, which developer form is used?
When using a water suspendible developer, Form C developer is typically used. This form is designed to be easily mixed with water to create a suspension that can be applied to the surface being inspected. It's commonly used in liquid penetrant inspection processes to enhance the visibility of indications or defects.
How often should one measure the strength of UV light?
Which kind of penetrant is less susceptible to cleaning fluid contamination?
Type II penetrants are less susceptible to contamination by cleaning fluids compared to other types. This is because Type II penetrants typically have a higher resistance to the effects of cleaning agents, allowing for more reliable inspection results in environments where cleaning is necessary prior to testing.
Increasing the temperature will:
"Raise the speed of evaporation of penetrants."
Increasing the temperature typically accelerates the evaporation of penetrants. This can impact the inspection process, as the penetrant needs sufficient time to penetrate into defects before being removed or reacted with during subsequent steps. It's essential to consider temperature control in non-destructive testing procedures to ensure accurate and reliable results.
Pollution of the penetration tool:
For water soluble developer, which kind of developer is used?
When using a water-soluble developer, Form B developer is typically used. This form is designed to be easily dissolved in water to create a solution that can be applied to the surface being inspected. It helps to draw penetrant out of defects and provides a contrasting background for better indication visibility during liquid penetrant inspection processes.
The water-washable penetrant's water content:
The water content of water-washable penetrants should be checked regularly to ensure that it falls within the specified range for effective performance. Regular checks help maintain the quality and consistency of the penetrant, ensuring reliable results during inspection processes.
When the manufacturer initially sends the penetrant:
"A sample of fresh solution should be collected and stored as a standard for future comparison."
When the manufacturer initially sends the penetrant, it's essential to collect a sample of the fresh solution and store it as a standard for future comparison. This allows for consistent quality control and ensures that any changes or discrepancies in the penetrant's performance can be detected and addressed promptly. Comparing it to the previous batch or storing it as a standard for future reference helps maintain quality and reliability in inspection processes.