Differential absorption of radiation by the object gives density variation in the film...
Gamma ray sources, amma ray camera projectors, film holders, film, lead screens, film processing equipment, film viewers, exposure facilities, radiation monitoring equipment.
Welds which have voluminous discontinuities such as porosity, incomplete joint penetration, corrosion, etc, Lamellar type iscontinuities such as cracks and incomplete fusion can be detected with a lesser degree of reliability. May also be used in certain applications to evaluate dimensional requirements such as fit-up, root conditions and wall thickness.
Generally not restricted by type of material or grain structure. Surface and sub surface inspection capability .Radiographic images aid in characterizing discontinuities. Provides a permanent record for future review.
Planar discontinuities must be favorably aligned with radiation beam to be reliably detected, radiation poses a potential hazard to personnel. Cost radiographic equipment, facilities, safety programs and related licensing is relatively high. A relatively long time between exposure process and availability of results. Accessibility to both sides of the weld required..
KOLKATA NDT EXCELLENE CENTRE -
Garia station, Uttarpara, Nabapally, PS :Narendrapur, PO: Dhalua, Uttarpara main road, Land mark: Between Balok sanghya club and Biharir Dokan. Exactly besides of Biharir Dokan. Kolkata-700152