Abnormal signals of high-pressure boiler pipe
Mainly describe the abnormal signals of high-pressure boiler pipe in the eddy current testing, and list the respective causes and treatment for different kinds of abnormal signals in detail.
Abnormal signals causes and treatment of high-pressure boiler pipe in the eddy current testing.
1. The continuous alarm signal of the head and tail pipe.
Cause Analysis: ` external grating fouling a instrument signal gate fault b the head and tail pipe cut c improper adjustment of the pinch roller.
Approach: ` eliminate grating fouling,and check the grating work a the instrument signal gate fault must be repaired btreat as normal defects c readjust pinch roller clamp degree
2. regular alarm signal certain parts of the boiler pipe.
Cause Analysis: ` hot rolling process defects a finishing process defects b improper adjustment of the pinch roller c poor anti-interference ability of the coil.
Approach: ` normal defect treatment, timely feedback a identify the reasons for the elimination of defects b readjust the pinch roller clamp degrees c replace the coil.
3. There is a distinct continuous signal of the phase.
Cause Analysis: ` overheating , hemp or correction concave surface defects of the steel outer surface a the coil center changed b iron scrap embedded in the inner wall of coilcthe coil zero potential is too large.
Approach: ` readjust the instrument parameters, use 3kHz flaw detection, and make the information recording and feedback
4. No significant bulk of the slug signal of the phase.
Cause Analysis: ` crumbs and other debris falling into the coils a there are bulk of the torn defect or wall contraction in the steel pipe b poor anti-interference ability of the coils.
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