lutions per second—the pulse repetition
rate can be standardized at 1 kHz, and
all transducers can be pulsed relative to
this rate. Any transducer-to-transducer
interference can be eliminated by the
standard transmitter delay function that
is built into the pulser/receiver unit.
The tube is transferred to the test
system by a walking beam transfer
device. As the tube moves into position,
a mandrel at the tube end engages the
tube and seals it. The transducer carrier
moves into position at the bottom of the
tube; an air spring applies pressure to
hold the transducer unit in the correct
position. Adaptive pitch rollers keep the
transducers a constant distance from the
tube or pipe wall.
Rather than relying on the operator to
make changes in the setup when changing to a new pipe or tube diameter, this
method relies on a diameter gauge to adjust the tube follower roll set to keep the
distance from the transducer to tube surface constant. This keeps the sound entry point constant (bottom dead center),
which keeps all angles and the sound
path constant. This nearly eliminates the
need to make adjustments to the transducers, minimizing changeover time.
Also, the operator doesn’t have to figure
the rotation rate. The operator enters the
OD at the control panel; an encoder determines the rotation rate.
Notches are made on a test standard that is the same diameter and wall
hickness as the tube to be tested. All
notches and drilled holes and the thickness coupon are made according to the
same requirements as the full body test
The length of the tested tube end is
approximately 10 in. The testing time
for small-diameter tube is about 4 seconds; testing time for large tube is about
8 seconds. The system typically finds 100
percent of the flaws with documented repeatability.
Joe Baldauff is vice president of
technology for Magnetic Analysis Corp.,
103 Fairview Park Drive, Elmsford, NY
10523, 914-530-2000, firstname.lastname@example.org, www.mac-ndt.com.
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