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GE Inspection Technologies

Ultrasonics

Krautkramer Testing Machines
ROT 65 VIS
ROT 140 VIS
ROT 350 VIS
Ultrasonic rotation tube testing machines
Seamless tubes in the lower to mediumdiameter range are usually tested for
flaws on the outer and inner surface as
well as inside the wall using rotation
testing machines. Besides these tube
types, pressure-welded tubes having
worked-offweld seams are also tested
on rotation units if the later tube application specifies a corresponding test.
The tubes are transported to the testing machine via linear roller conveyors
having speedsfrom about 30 to 120
m/min. The test can be carried out in
single tube testing mode or in continuous end-to-end testing mode to reduce
the untested ends. Several triple or double roller driversovertake the guidance
and the constant transport of the tubes
directly before and after the rotation mechanics. The smaller the tube diameter,
the more accurate the guidance of the
tubes has to beduring the test. Guided
by additional guide bushes in the ROT
mechanics, the tubes are immersed in
the rotating water jacket.
The rotor contains up to 4 (ROT 350) or
6 (ROT 65/140) test moduleswhich are
equipped with probes for the required
test types and which are successively
released for testing in order to obtain as
short untested tube ends as possible.
The probes are not in directcontact with
the tube surface. The ultrasonic coupling is effected via the rotating water
jacket (water delay line). Different probe

ROT 140 VIS with double driver

systems can ce activatedwithin the
rotatation mechanics, depending on the
current test task. The ultrasonic signals
are transmitted from the high-speed rotor to the stator via special slipring systems equipped with triplebrush units.
The newly developed, PCB-based and
fully parallel operating ultrasonic test
and evaluation electronics, type VIS,
processes all returning signals and carries out a separate evaluation...