Non Destructive Test (NDT) Checks
The NDT checks are mainly carried out to study the mechanical property of metal. These tests are carried out
(a) To find out the internal soundness of a metal to know surface defects and inspect for an incorrect assembly where stripping is not possible, non destructive tests are carried out on metals.
(b) NDT help in saving man hours, reduction in unserviceability time of equipments and allows more frequent and thorough examination, thus increasing industrial safety.
(c) NDT makes component more reliable, safe and economical and help in maintaining high standard of serviceability.
(d) The tests can be applied to metals in their raw state, before or after machining and during the entire life of a component in use thus these tests are more reliable than the destructive tests.
(e) NDT is the generic title for those methods of testing, examination or inspection, which do not render a material, equipment, system or a structure unfit for future use. NDT improves the safety standards, increases the equipment availability and reduces servicing cost. Due to its reliability, cost effectiveness and importance in health assessment, more and more NDT Techniques / Equipments are being used in many industries. It is therefore important that knowledge and skill of the technician is improved in this sphere of activity.
(f) NDT helps in detection of inherent defects (eg. Variation in grain size, chemical composition, processing defects (porosity, machining, plating) and service defects (fatigue, pitting and cracks). The selection of technique depends on the types of material, shape, size, location of the item, and possible defects that need to be assessed. Each technique has its own merits and demerits. A combination of one or more techniques can also be used depending on the nature of defect.
Detection Methods : There are many flaw detection methods in current use. Methodology of certain common techniques is given below:-
(a) Visual Inspection
(b) Dye-Penetrate
(c) Eddy Current
(d) Ultra Sonic
(e) Radiography / X-ray
(f) Endoscope / Fibrescope
(g) Magnetic Particles Technique
The NDT checks are mainly carried out to study the mechanical property of metal. These tests are carried out
(a) To find out the internal soundness of a metal to know surface defects and inspect for an incorrect assembly where stripping is not possible, non destructive tests are carried out on metals.
(b) NDT help in saving man hours, reduction in unserviceability time of equipments and allows more frequent and thorough examination, thus increasing industrial safety.
(c) NDT makes component more reliable, safe and economical and help in maintaining high standard of serviceability.
(d) The tests can be applied to metals in their raw state, before or after machining and during the entire life of a component in use thus these tests are more reliable than the destructive tests.
(e) NDT is the generic title for those methods of testing, examination or inspection, which do not render a material, equipment, system or a structure unfit for future use. NDT improves the safety standards, increases the equipment availability and reduces servicing cost. Due to its reliability, cost effectiveness and importance in health assessment, more and more NDT Techniques / Equipments are being used in many industries. It is therefore important that knowledge and skill of the technician is improved in this sphere of activity.
(f) NDT helps in detection of inherent defects (eg. Variation in grain size, chemical composition, processing defects (porosity, machining, plating) and service defects (fatigue, pitting and cracks). The selection of technique depends on the types of material, shape, size, location of the item, and possible defects that need to be assessed. Each technique has its own merits and demerits. A combination of one or more techniques can also be used depending on the nature of defect.
Detection Methods : There are many flaw detection methods in current use. Methodology of certain common techniques is given below:-
(a) Visual Inspection
(b) Dye-Penetrate
(c) Eddy Current
(d) Ultra Sonic
(e) Radiography / X-ray
(f) Endoscope / Fibrescope
(g) Magnetic Particles Technique