Dissimilar steel electron beam welding line ultrasonic testing test block and test method

Abstract

The invention discloses a dissimilar steel electron beam welding lineing line ultrasonic testing test block and a test method. The test block consists of a parent metal I and a parent metal II, both having a thickness of T; a butt welding lineing line for connecting the parent metal I and the parent metal II is formed between the parent metal I and the parent metal II; the parent metal I and the parent metal II are the same as the to-be-tested dissimilar steel in material and thickness respectively; the welding lineing technology of the butt welding line is consistent with the welding technology of the to-be-tested dissimilar steel; three long cross holes are formed, along the thickness of the test block, on the center line of the butt welding line; the three long cross holes are formed onthe positions, shown in the description, of the test block thickness, sequentially from top to bottom; a notch groove extending along the width direction is formed at the root part, on the center line, of the butt welding line. According to the test block and the test method disclosed by the invention, the problems in ultrasonic test of electron beam welding joint of dissimilar steel can be solved, the operation is simple, and the flaw detection rate is high that internal flaws of long cross holes having equivalent size greater than Phi1mm can be detected; the sector of a phased array shows that the unmelted flaws that the welding line root depth exceeds 2mm can be detected.

Description

Technical field [0001] The invention relates to the technical field of ultrasonic flaw detection, in particular to a test block and a detection method for ultrasonic detection of dissimilar steel electron beam welds. Background technique [0002] Electron beam welding products of dissimilar steels are generally used in special environments such as strong corrosiveness and high temperature. The welding quality is very high, and no root defects such as unmelted roots and large internal holes are not allowed. When the thickness of electron beam welding of dissimilar steel is small, radiographic inspection can be used, but the depth of the defect cannot be located, and the sensitivity gradually decreases with the increase of thickness, and the detection effect of root unmelted defects is very poor. In addition, the structure of products using electron beam welding is generally more complicated, such as plug-in socket structure, arc-shaped corner joint structure, etc. These more compl...

AI Technical Summary

Problems solved by technology

[0004] The root defect of electron beam welding is close to the bottom surface of the weld, and its spatial distribution of defects makes the applicability of ordinary ultrasonic testing methods poor. The defect echo is easily confused with the bottom surface reflection wave, and it is very difficult to identify

Ultrasonic testing can detect internal defects in butt welds, and is widely used in various types of welded joint testing, and the relevant evaluation standards are relatively complete. At present, the comparison test blocks for ordinary ultrasonic testing do not consider the acoustic characteristics of different materials The difference will cause positioning and quantitative errors during detection, and the long horizontal hole is used as the reference reflector in the test block, and no independent reference reflector is set for the root welding defect, which is easy to miss judgment; and the conventional ultrasonic testing process is easily affected. Influenced by the spatial orientation of dissimilar steel welding defects, it is necessary to select probes from various angles for detection, which is very inefficient and cannot achieve rapid and accurate detection of welds

[0005] The sound beam focusing function of phased array ultrasound makes it have unique advantages in defect identification, and can be used for root defect detection. At present, there is no ultrasonic detection or phased array ultrasonic detection for dissimilar steel electron beam welding internal and root defects. Applied research, and associated outcome evaluation criteria

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