- since 1996 -
|NDT.net Issue - 2007-08 - NEWS |
General Description of the Application
During the manufacture of bridge structures, a lot of automated welding is used to rapidly and efficiently build multiple parts. One of these welding processes is a system that uses opposing arcs to weld stiffeners to webs on
the bridge parts. This welding process produces horizontal fillet welds simultaneously on both sides of a tee-joint.
Thickness of the stiffeners: 10 mm to 16 mm (or more)
Manual inspection using one small phased-array probe
Omniscan MX acquisition unit (weld package)
The probe is configured to perform the azimuthal scan from 40 to 70 degrees in the OmniScan software. The display and gain level are adjusted using a blank sample compared to a sample that includes the rejected defect.
Due to the multiple angles and the focusing capabilities, this technique is not based on amplitude detection, but on signal recognition of each type of defect, added to an accurate positioning of the defect in the weld.Client´s Comments
With this method, we have been able to improve the efficiency, the precision, and the quality of our inspections. Furthermore, this new technique allows the technician to evaluate defects more easily. Now, the phased-array ultrasound technology is helping us evolve as ultrasonography did for medicine.
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