2.1.1 Where a primer is used to coat steel after surface preparation and prior
to fabrication, the composition of the coating is to be such that it will have no
significant deleterious effect on subsequent welding work and that it is compatible
with the paints or other coatings subsequently applied.
2.1.3 Three butt weld assemblies are to be tested using plate material 20 to 25
mm thick. A vee preparation is to be used and prior to welding, the surfaces and
edges are to be treated as follows:
- Assembly 1 – Coated in accordance with the manufacturer’s
instructions.
- Assembly 2 – Coated to a thickness approximately twice the
manufacturer’s instructions.
- Assembly 3 – Uncoated.
2.1.4 Tests as follows are to be taken from each test assembly:
-
Radiographs. These are to have a sensitivity of better than two per
cent of the plate thickness under examination, as shown by an image quality
indicator.
-
Photo-macrographs. These may be of actual size and are to be taken
from near each end and from the centre of the weld.
-
Face and reverse bend test. The test specimens are to be bent by
pressure or hammer blows round a former of diameter equal to three times the
plate thickness.
-
Impact tests. Tests are to be carried out, at ambient temperature, on
three Charpy V-notch test specimens prepared in accordance with the
requirements of the Rules for the Manufacture, Testing and Certification
of Materials. The specimens are to be notched at the centreline of
the weld, perpendicular to the plate surface.
2.1.5 The tests are to be carried out in the presence of an LR Surveyor or by
an independent laboratory specialising in such work. A copy of the test report is to
be submitted, together with radiographs and macrographs.