Page 235 - Welding of Aluminium and its Alloys

Weld defects and quality control 215

• Health and safety considerations – large areas may need to be closed
off during radiography or enclosures must be provided in which the
radiography is carried out. Radiographers must also be monitored for
exposure to radiation.
• Access is required to both sides of the component, the source on one
side, the film on the other.
• There are problems in detecting planar defects and fine cracks if these
are normal to the beam.
• There is a limitation on the thickness that can be radiographed and
defects easily detected.
• Skilled and experienced radiographers are required.
• The depth and through thickness dimension of a defect is very difficult
to determine.