In recent years, steel structures have been widely used, especially in industrial factories. If the quality used in such industrial factories does not meet the requirements, it will pose a great potential danger to the safety of the people's lives. With the increasing attention paid to this issue, many enterprises will seek specialized steel structure inspection structures for quality testing before industrial factory buildings are delivered for use. Today, we will take you to learn about common problems and answers in steel structure inspection.

1、 What are the reasons for generating interference echoes in ultrasonic testing of welds? How do we distinguish interference echoes?

In ultrasonic testing of welds, due to the complex geometric shape of the weld, interference echoes are generated due to the shape. On the other hand, interference echoes are caused by the diffusion, waveform conversion, and changing the propagation direction of the ultrasonic wave. The main method for distinguishing interference echoes is to use computational analysis to find the source of various echoes.

2、 What harm can an incorrect adjustment of the time scan line ratio cause?

The correct adjustment of the time scanning line ratio will directly affect the accuracy of defect positioning. If it is not correct, it may lead to misjudgment and missed detection.

3、 Is there a standard for accurately measuring waveform?

Firstly, it is necessary to distinguish between normal echoes and abnormal echoes. By learning ultrasound knowledge, interference echoes, bottom echoes, and defect echoes can be distinguished, in order to better confirm the defect echoes before conducting auxiliary and length measurements, and then making corresponding judgments.

4、 Why is a straight probe usually used for ultrasonic testing of steel plates?

Due to the fact that the plate is rolled, most of the defects in the plate are parallel to the surface and flat. Therefore, conducting vertical inspection in the direction of plate thickness is more conducive to discovering defects.

5、 In actual testing work, some joint testing conditions are not sufficient. How can the report indicate this? What probe is more suitable for ultrasonic testing of large forgings? What is the reason?

It is necessary to indicate the selection of probes and the selection of detection surfaces in the report. There are three main reasons for using a probe for ultrasonic testing of large forgings: firstly, forging defects are generally parallel to the direction of forged fibers; The second is that the detection surface is usually selected on a surface parallel to the direction of the forged fiber; Thirdly, the forging has a large size and strong penetration through longitudinal wave testing.

The above are common questions and answers about steel structure testing, hoping to help everyone better understand the knowledge of steel structure testing.