On-Line Eddy Current Testing Of Weld Seams For ERW Tube And Pipe
InspecTech® A Division of InspecTech Analygas Group Inc. 450 Midwest Road, Toronto, Ontario, Canada, M1P 3A9 Tel: 416-757-1179 Fax: 416-757-8096 Email: email@example.com Web: www.inspectech.ca
Ideal for testing thin wall welded tubular products.
Can locate spherical and circular defects including pinholes at high mill speeds.
Full impedance plane display included as standard.
Differential and Absolute detection modes included as standard.
Data logger and defect marking system included as standard.
Ability to cover a wide range of Weld-Line Wander.
User friendly and low initial cost.
An Eddy Current test of welded tube, as it is made on-line, uses a probe positioned
over the weld-line with minimal clearance as the tube passes under. This is a cost
effective method of testing welded tube.
In the case of magnetic materials, there is also the requirement to saturate the
weld. This means that the material to be tested must be magnetized to a high level,
at which point it will behave under Eddy Current conditions in much the same way
as any non-magnetic material.
If residual magnetism is of concern in finished carbon steel or ferrous stainless
steel tubular products, InspecTech offers a separate Demagnetizing unit that is mounted
down-stream from the Eddy Current test system.
The operator’s screen includes full impedance plane display plus strip chart and
The Eddy Current application has a separate Data Logger software (supplied pre-loaded)
that allows all relevant information from each session to be stored and downloaded
for printing or storage at another location. The information stored by the Data Logger
includes operator ID, calibration data, alarm settings, and information relating
to total production and alarm locations (distances in metres or feet along the inspected
The InspecTech® Eddy Current Test System is particularly suitable for the following:
High-speed mill operations, small defects can be detected at high throughputs.
Detecting spherical, circular and pinhole defects.
Locating butt welds and forge welds in skelp.
Areas in which Eddy Current testing is less effective include:
Detecting long, continuous defects.
Testing heavy wall material.
InspecTech does not recommend the use of Eddy Current testing on tube products with
galvanized or aluminized coating materials.
InspecTech's unique Flux Leakage Weld-Line Test System is better suited to such applications.