1-8 Issue 05, 01/01 Krautkramer DM4E / DM4 / DM4 DL
Introduction Important remarks about thickness testing
ditions are listed for a reliable thickness measurement:
• Operator training
• Knowledge of the special technical requirements
and limits of testing
• Selection of the most suitable test setup
Operator training
For operation of an ultrasonic measurement instru-
ment adequate training is required in the field of ultra-
sonic thickness measurement. Appropriate training
includes, for example, knowledge of the following:
• Theory of sound propagation in materials
• The effects of material sound velocity
• Behavior of sound waves at interfaces between
different materials
• Propagation of the sound beam in the material
• Effect of the materials surface quality.
Insufficient knowledge of the above mentioned fields
can cause incorrect test results and could thus have
unforseeable consequences. Information about exist-
ing possibilities with regard to ultrasonic operator train-
ing as well as qualifications and certificates can be
obtained from the national NDT organizations, e.g. in
Germany: the Deutschen Gesellschaft für Zerstö-
rungsfreie Prüfung e.V., Motardstrasse 54, D-13629
Berlin; or from Krautkrämer GmbH & Co., Training
Department.
Krautkrämer holds courses at regular intervals for
training specialists in the field of ultrasonic testing.
Dates will be given on request.
Limits of ultrasonic testing
The ultrasonic test information only concerns the area
of the test object which is covered by the sound beam
of the probe being used. Therefore care should be taken
in case conclusions from the results of the tested area
are drawn from the untested areas of the test object.
Such conclusions are normally only allowed when
extensive experience exists with regard to the test
object and proven methods of statistical data acquisi-
tion are available.
1-8 Issue 05, 01/01 Krautkramer DM4E / DM4 / DM4 DL
Introduction Important remarks about thickness testing
ditions are listed for a reliable thickness measurement:
• Operator training
• Knowledge of the special technical requirements
and limits of testing
• Selection of the most suitable test setup
Operator training
For operation of an ultrasonic measurement instru-
ment adequate training is required in the field of ultra-
sonic thickness measurement. Appropriate training
includes, for example, knowledge of the following:
• Theory of sound propagation in materials
• The effects of material sound velocity
• Behavior of sound waves at interfaces between
different materials
• Propagation of the sound beam in the material
• Effect of the materials surface quality.
Insufficient knowledge of the above mentioned fields
can cause incorrect test results and could thus have
unforseeable consequences. Information about exist-
ing possibilities with regard to ultrasonic operator train-
ing as well as qualifications and certificates can be
obtained from the national NDT organizations, e.g. in
Germany: the Deutschen Gesellschaft für Zerstö-
rungsfreie Prüfung e.V., Motardstrasse 54, D-13629
Berlin; or from Krautkrämer GmbH & Co., Training
Department.
Krautkrämer holds courses at regular intervals for
training specialists in the field of ultrasonic testing.
Dates will be given on request.
Limits of ultrasonic testing
The ultrasonic test information only concerns the area
of the test object which is covered by the sound beam
of the probe being used. Therefore care should be taken
in case conclusions from the results of the tested area
are drawn from the untested areas of the test object.
Such conclusions are normally only allowed when
extensive experience exists with regard to the test
object and proven methods of statistical data acquisi-
tion are available.
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