0
The contact angle is the angle in which the liquid interface meets the solid surface. The contact angle should be as small as possible to have an effective penetrant material.
Wiki User
∙ 9y ago
Add your answer:
Earn +20 pts
What are the Types of penetrant inspections?
visible inspection and flourescent insp ection
What is the meaning of filet weld?
The word fillet is used to describe a radius or angle at the joint of an angle instead of a shrap corner. It is sort of like when you use caulk to fill in the sharp corners when you are making a counter top. In a fillet weld you contact both peices of metal being joined at the 90 degree angle to "fill in" the joint.
Where can I get my ccna certification?
There are two ways to register for the ccna exam: Registration at the local VUE test center Register directly on the VUE official website Registration process at your local VUE test center: Fill in the candidate registration form: Candidates should provide the candidate’s name, E-MAIL address, English contact address and zip code, contact number, test number and name when registering; candidates who are not taking the test for the first time should also provide the candidate ID. After confirming that the information is filled in correctly, return it to the examiner. Pay the relevant fees for the examination and register for the examination Exam appointment: Candidates must make an appointment for the exam the day before the exam The test time is from Monday to Saturday, and the test on Saturday should be reserved before Friday. When making an appointment by phone, candidates should provide the test administrator with their name, test date, test code, address, E-mail, mobile phone number, etc. Registration: After the candidate makes an appointment for the examination, the examiner will help the candidate to register for the examination and make all the preparations for the examination; The registration cannot be cancelled. If the candidate does not take the test within the appointment time, it will be regarded as an absence and the test fee cannot be refunded. If you need to reschedule the test due to the question bank or other reasons after the appointment is successful, you can contact the test center by phone Or go directly to the VUE website to change the test date Reschedule at least 1 working day in advance
What object has an acute angle?
the answer is a stapler a stapler has an acute angle
The angle of incidence is the angle between the incident ray and the line to the surface?
Line perpendicular to the surface.
Types of penetrating liquid used in liquid penetrant test?
Low molecular weight hydrocarbons - anything with a very low surface energy/contact angle/surface tension.
When conducting a penetrant test what does the spherical indications on the surface of a part mean?
Porosity
True or false the fluorescent penetrant fade test usually makes use of the aluminum test blocks to perform the test?
true
What does ASME Section V Article 6 say?
It Deals the liquid penetrant test. and its principal is capillary action
What is the unit of angle of contact?
Contact angle is the angle that a drop of liquid makes as it meets the surface or interface of another phase, usually a solid
What is liquid penetrant test in non destructive testing?
Liquid penetrant inspection is a nondestructive testing method that does not harm the test piece and is commonly used on materials such as metals, glass, plastics and fired ceramics. This nondestructive testing method relies on the liquid penetrant seeping into the flaw, then forming a surface indication that is observed under special lighting after the penetrant is given time to "bleed out" from the flaw. Liquid Penetrant Inspection (LPI or PT) is very effective in detecting flaws that are open to the surface such as fatigue, quench or grinding cracks; forging cracks and bursts; overload and impact fractures; porosity; laps and seams.The ProcessAt Laboratory Testing Inc., the first step in Liquid Penetrant Inspection is to thoroughly clean the surface to be inspected to be sure it is free of oil, grease, water, heat-treat scale, paint, plating and other contaminants that may prevent liquid penetrant from entering flaws. The part may also require etching if mechanical operations such as machining, sanding, or grit blasting have been performed because they can smear metal over the flaw opening and prevent the penetrant from entering.Next, a red visible or fluorescent dye liquid penetrant is applied to the part by spraying, brushing or immersing in a penetrant bath. The liquid penetrant is left on the surface for a sufficient time to allow as much penetrant as possible to seep into a defect. Penetrant dwell time is the total time that the penetrant is in contact with the part's surface.After the dwell time has elapsed, the excess liquid penetrant is removed from the surface. Depending on the penetrant method used, this step may involve cleaning with a solvent (solvent-removable), direct rinsing with water (water-washable), or first treating the part with an emulsifier (post-emulsifiable) before rinsing with water. When using the water-washable or post-emulsifiable methods, the part is placed in a low-temperature oven and allowed time to dry after rinsing.A thin layer of developer is applied to the part to assist in drawing penetrant trapped in flaws back to the surface where it will be visible as indications. Developers may be applied by dusting (dry powder) or spraying (wet developers). These indications are larger than the actual flaw, and therefore, are more visible. When using fluorescent penetrants, indications must be viewed under darkened conditions with a high-intensity UV lamp. The final step in the process is to thoroughly clean the surface to remove any residues.Advantages and LimitationsLiquid Penetrant Inspection offers a fast and relatively inexpensive means of surface inspection since large areas and quantities of parts or materials can be inspected quickly. The process is flexible for inspecting parts of almost any shape and for most materials that are not extremely rough or porous. This process is a nondestructive testing method which does not cause harm to the parts or products being tested. Indications are produced directly on the surface of the part and provide a visual representation of the flaw. Liquid penetrant inspection is highly sensitive to small surface discontinuities.One of the major limitations of a penetrant inspection is that flaws must be open to the surface. Also, surface finish and roughness can affect inspection sensitivity. Pre-cleaning of parts is critical since contaminants can mask defects, and post-cleaning is required to remove residues.
What is the notch angle in izod impact test.?
45 degree angle
Calculation of contact angle?
Angle of contact is the angle between a tangent to the liquid surface at the interface and the solid surface inside the liquid. For concave surfaces, it is acute . For convex surface , it is obtuse.
What is LPI in NDT?
Liquid Penetrant Inspection
Who can perform Dye penetrant inspection?
Penetrant inspection should be performed by a certified NDT (non-destructive testing) laboratory by a certified (Level II or III) inspector. There are many criteria for succesfully passing Penetrant Inspection. This type of test is usually performed in accordance with some kind of industry standard usually specified on an engineering drawing or blueprint. Just look up NDT or non-destructive testing laboratories in your area and they should be happy to answer more detailed questions.
How do you measure the contact angle?
There are many ways to measure a contact angle, but the simplest way is to use a goniometer. The image of the droplet is taken with a high resolution camera; the angle can then be measured using a protractor.
The angle between a tangent and the radius of a circle att the point of contact is?
It is a right angle
