Abnormal signals of high-pressure boiler pipe

Abnormal signals causes and treatment of high-pressure boiler pipe in the eddy current testing. 

Abnormal signal:

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 feedbacka readjust the coil centerb carefully check coil inner wall, remove embedded iron scrap.c replace the coil.

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.

Approach: ` remove the iron oxide scrap in the coil, and adjust the nozzle position and soot blowing time a treat as normal defect b replace the coil.