Abstract
The article deals with non-destructive ultrasonic identification of lack of fusion and penetration in circumferential fillet welds in gas industry by using Phased Array method. These types of welds are used mainly for repairs of gas pipelines during operation. The main aim of this paper is to compare results of measurements of the weld with and without defect. Phased Array testing procedures for circumferential fillet welds methods are also described in this article.
Highlights
Until recently, pipeline weld inspection has been traditionally solely the domain of radiography
As is the case with conventional transducers, phased array probes can be designed for direct contact use, as part of angle beam assembly with a wedge, or for immersion use with sound coupling through a water path [3]
The lack of fusion is displayed on the screen as angular sector indication
Summary
Pipeline weld inspection has been traditionally solely the domain of radiography. With the advent of modern ultrasonic technique Phased Array (PA), ultrasonic testing has proven to be an effective option to detect weld defects in gas pipeline welds oriented unfavourably for radiography. Standard STN EN 12732 affords to replace X-ray by ultrasound technique in the control steel pipelines. One of these serious weld defects is lack of fusion and incomplete penetration in weld. It produces the notch effect, which can cause pipeline destruction during operation. This defect can be reliably identified by modern ultrasonic technique PA
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