GE SpotChecker, Operating Manual

Page: 60 / 98

Evaluation Assistance II
The Evaluation Assistance II is applicable to two-
and three-plate inspections (total wall thickness 1 to
12 mm). The sound path (round trip) is determined for
all echoes exceeding the evaluation threshold. The
corresponding inspection criterion is calculated for
the sound path intervals
fi led in the table “Sound path
ranges”. In this connection, the evaluation criteria take
the drop in the echo sequence due to the sound atten-
uation in the spot weld structure into account.
The default setting of the table can be changed by the
user in order to adapt the evaluation assistance tool
to individual material conditions. For this purpose, it is
necessary to carry out a suf
fi cient number of corre-
sponding comparison measurements. The evaluation
results depend on the occurrence of
fl aw echoes.
Simultaneously with the de fi nition of the evaluation
ranges in tabular form, SpotChecker presents the
graphical display and setting of the ranges. The rang-
es shown by different colors can be easily edited and
moved by means of the mouse. The graphical repre-
sentation makes the setting easier together with the
clear marking of the backwall and
fl aw echoes.
H
Note:
The allocation of sound paths to evaluation criteria
must be based on a suf
fi cient number of exact com-
parison measurements in order to avoid any measure-
ment errors in the automatic evaluation as far as pos-
sible.
Advantage: The Evaluation Assistance II is well suited
for steel alloys. The evaluation criteria can be adapted
to speci
fi c local or material-dependent conditions by
an ultrasonic specialist.
Individual inspection reports
The software SpotChecker
60
Issue 02, 03/2009 SpotChecker