The Ultrasonic Testing of Thinwalled Steel Casting
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摘要: 分析了薄壁铸钢件超声检测的技术难点，通过制作含有人工和自然缺陷的对比试块，对近场区不同距离的人工缺陷的波幅进行了相对精确的设定；通过对含有人工缺陷和自然缺陷的工件进行断裂试验和金相分析，确定了检测用对比试块的人工缺陷尺寸，建立了距离波幅曲线，并以距离波幅曲线作为验收的基准灵敏度，有效解决了无现行参考标准的薄壁铸钢件的超声检测的问题，实践证明该方法能有效控制薄壁铸钢零部件的质量。Abstract: In order to use ultrasonic pulse reflection method to detect the internal defects of mine machinery thinwalled steel parts, the authors investigated the cause of the failure of the parts through the destructive test and xray test. The technical difficulties in the ultrasonic detection of thinwalled steel members were analyzed. Through the production of reference blocks containing artificial and natural defects, and by comparison method using reference, amplitudes of the artificial defects with different near field distance were relatively accurately set. Fracture test and metallographic analysis were used to determine the defect sizes so as to establish the distance amplitude curve, based on which the distance amplitude curves could be established and hence the inspection of thin walled steel castings by using ultrasonic testing could be realized, solving the problems of its testing without available reference and acceptance standards. The practice has proved that the method can effectively control the quality of thinwalled steel parts to a certain extent, thus solving the problem of ultrasonic inspection of thin walled steel castings.
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Keywords:
- Ultrasonic testing /
- Near field region /
- Thinwalled /
- Steel castings
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