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This
equipment is to provide both ultrasonic and eddy current inspection
of tube and bar products. The ultrasonic inspection is achieved
using a number of adjustable Water Column Coupled Probe (WCCP)
units for shear wave longitudinal flaw detection and fixed WCCP
unit for thickness monitoring. The eddy current inspection uses
differential probes mounted in holder attached to the WCCP units.
Diameter
range 50mm to 400mm
WCCP ultrasonic
probe units
Longitudinal,
oblique and transverse ultrasonic shear wave testing
Compression
wave testing
Eddy current
inspection for surface defects
This
ultrasonic inspection system will rotate a bar or tube on a precision
set of heavy duty polyurethane covered drive rolls and to scan
the ultrasonic test heads along the length of the product in a
controlled helix. The product rotational speed and the inspection
helix are continuously variable in order that the optimum inspection
speed is obtainable, for the specific flaw types to be detected
and the product diameter.
The
test heads incorporate WCCP type probe units for ultrasonic testing
and can include eddy current probes for surface testing. The WCCP
(Water Column Coupled Probe) units are designed to give a high
signal to noise ratio without requiring immersion testing. The
test heads ride on the product upper surface and give excellent
access and ease of adjustments. Units are available for longitudinal,
transverse and oblique ultrasonic shear wave testing, and also
lamination and thickness ultrasonic compression wave testing.
Multiple function test heads are readily configured for specific
test requirements with up to ten WCCP units in each test head.
The WCCP units may also be combined with an eddy current test
for high sensitivity surface inspection. Adjustable oblique shear
wave WCCP units are available. The compact configuration of the
WCCP unit enables testing to less than 20mm from the product ends.
WCCP
Ultrasonic Probe Units
The WCCP units have been developed to replace existing water jet
type probe units and to obtain an inspection signal to noise ratio
similar to that of immersion systems. Units have been supplied
for longitudinal shear wave and compression wave inspection. In
addition a mode conversion technique is available for inspecting
the bores of low Diameter/Thickness ratio tubes using easily interchangeable
probe top blocks.
The
units are very compact and permit multi-probe heads to be configured
using a simple modular construction. The latest WCCP twin units
can configure ten probes in a 100mm length. The index between
probes is selected to ensure full interlacing of probe scans.
Standard multiple probe configurations have been defined such
that full interleaving of probe scans is achieved for detection
of a specific minimum flaw length or full ultrasonic coverage.
The
WCCP units offer the following advantages:
-
Units applied to product top surface to give easy access for
setting up
-
Good
signal to noise ratio with performance similar to immersion
systems
-
Minimal
adjustment when changing tube diameters
-
No
immersion tank required
-
Inspect
within 20mm of the product ends, with instantaneous coupling
-
Incorporate
end detection facilities using small receiver probes to monitor
product position
-
Supplied
with probe top blocks to permit low Diameter/Thickness ratio
tubes to be tested.
Mechanical
Handling Systems
A
range of scanning tube and bar inspection systems is available;
these can be configured for varying product diameters, lengths
and weights.
A
complete system typically comprises:
- Inlet roll
down rack
- Stack catchment
arms
- Automatic
Load
- Roller drive
for the product with variable speed
- Automatic
unload to the left and right
- Single accept
collector
- Twin reject
collectors with diverter
- Overhead
gantry to support the probe head which houses a number of WCCP
units, with a drive system to scan this probe head along the length
of the product while it rotates
- re-circulating
water system with purging and catchment, ultrasonic system only
- Optional
paint marking system
- Electrical
control desk with PLC unit for full facilities for automatic,
manual and investigate flaw modes of operation
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