In the weld on both sides of the vertical and horizontal are not the same direction to improve the direction of inspection, the shortcomings of the echo is not the same position, showing sub-times was irregular, each of the echo signal showed a single sharp echo, and the bottom wave not seen or height drop. Probe movement in the same orientation inspection, the seamless tube echo signal showing a group of dense defects echoes, shortcomings are close to each other, bumps are not the same, the reflection of the signal of each other, fluctuated, if the resolution, then each of the individual echo signals exhibits the characteristics of the dotted defects. According to the vertical and horizontal defects in the vertical and horizontal direction of the echo and the sub-order was irregular, successive episodes of the bottom wave or bottom wave ups and downs in the 50% of the characteristics of the assessment can be judged as a dense shortcomings.
More common shortcomings of dense defects such as dense pores, and then hot cracks and other shortcomings, this seamless steel pipe defects is a group of shortcomings of the mobilization, each small gap between each other close to each other can not locate each individual small quantitative.
In the weld on both sides of the vertical and horizontal are not the same direction of the progress of the line check, the shortcomings of the echo is generally high and the shape of a single rule, the height of the same and no significant changes in a wide range, successive defects. And in the same direction, the bottom wave height also no significant changes, only the signal is not clear off a large interval, seamless pipe defects simply, can be measured short points indicate length ΔL. The shortcomings of the echo peak steadily from zero to the peak and hold a straight part, and then smoothly down from the peak to zero, both sides of the weld can be checked. According to the seamless steel pipe vertical and horizontal shortcomings of the height of the same as no significant change, the peak echo rise and fall characteristics can be assessed as a strip of shortcomings.
The seamless pipe can be used to indicate the length of the test, but it is not easy to measure the cross-sectional scale (height and width); however, in the length direction may also be continuous, such as chain-like slag, intermittent not penetration, intermittent untreated and so on.
