Range of application:
• All materials
Principle of measurement:
Radiography is a method where x-rays are sent through the material in order to examine the interior of a weld. Radiographic testing is based on the ability of the radiographic radiation (x-ray and gamma radiation) to penetrate materials in order to blacken a film. Rays passing through a material will be absorbed, depending on the thickness and density of the material.
A radiation source is placed at a suitable distance from the object. A blind space (in x-ray control) or a collimator (in gamma control) will normally be placed between the source and the object in order to filter the useless rays (secondary rays). Variation in the intensity of the rays that slip through is recorded on a film, which is placed as close as possible to the object on the opposite side of the radiation source.
The radiographic tests are performed by Level 2 or Level 3 operators with Norwegian radiation protection certificates issued by the Norwegian Radiation Protection and offshore safety courses.
Detects:
• Volume faults (e.g. pores, slagging)
• Level faults at favourable radiation direction
• Surface faults (e.g. pores, edge wounds, cracks)
Advantages:
• Permanent reporting
• Excellent for volume faults
• Portable equipment
Limitations:
• Radiation
• Requires barriers
• Requires access from both sides
• Form/geometry restricts testing in e.g. T-joints
Our radiographic equipment:
• Eresco 42 MF 3 series 200KV
• NOVA Developing machine
• Vidisco Digital Flat Panel System
• ICM CP1202 battery-operated x-ray apparatus
• Light boxes, gauges, etc.