13
Figure 6
Function control of the device with the use of Al-scanner
а)
surface image of test-object No1
b)
magneto-optical visualization of magnetogram of test-object No1
priming;
two-layer tinting with aerosol motor enamel using cold
drying using technology corresponding to repairs coating.
Test-object №2 (Fe) (Fig. 7) is the imitator of Category “A”
control object (the data carrier of the vehicle body). It is executed in
the form of a plate made of a sheet of tool steel 2 mm thick
“20165”
.
The initial
number is applied by machining process of pressing (cold
pressing). The initial number was made in the following way: manual
stamping using “№10 type” markers kit and hammer on a massive
anvil . The depth of digits
relief makes about 0 .3-0 .4 mm .
All digits of the initial number were removed by removing
the metal superficial layer of the test-object to the depth of 0.5
mm. The superficial layer was removed from the initial marking by
machining process of cutting (milling and polishing) .
As a result of the mentioned processing of the test-object surface,
the initial marking can not be observed by visual-optical methods (as
the relief is removed) . However, internal residual tension, produced
as a result of deformation of the metal when executing the initial
marking, remains in the superficial layer of the test-object metal.
