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某些工件有时要采用不同K值的探头进行超声波探伤,如国家质量技术监督局锅炉压力容器安全监察局颁布的《工业锅炉T型接头对接焊缝超声波探伤规定》中就规定“腹板面两种K值斜探头单面单侧一次反射法探伤……”。在现场探伤中,若能在同一台超声波仪器上,经过一次时基线扫描比例调节,就能交替使用不同K值的探头,无疑是非常实用的。尤其是用于需同时观察两种K值探头波形的部位更是方便。当然采用数字式超声仪器可以满足这一要求。鉴于在我国普及数字式超声仪器还需相当长的一段时间,所以若能在普通模拟超声仪器上实现这一点就很有现实意义。经过探索,我们已能在工作中运用这种方法。1 同一普通模拟超声仪上使用不同K值探头的方法介绍现以一实际工件为例作简要介绍。工件结构如图1所示,图中焊缝宽度15mm,探头前沿为10mm。按工艺在单面腹板上用K2.5和K1探头分别探伤,另用直探头在翼板上焊缝相应区域探伤。超声波探伤仪采用CTS-22A型,先将K2.5探头按水平1:1调好扫描速度,作出DAC_(K2.5)基准线
Some of the workpiece sometimes use different K value of the probe for ultrasonic flaw detection, such as the State Quality and Technical Supervision Boiler and Pressure Vessel Safety Supervision Bureau promulgated the “Industrial Boiler T-Joint Butt Welds Ultrasonic Flaw Detection Regulations” on the provisions of “web two K-value oblique probe single-sided single-sided reflex testing ...... ”. In the field testing, if the same ultrasonic instrument, after a time when the baseline scan ratio adjustment, you can alternately use different K-value probe, no doubt is very practical. Especially for the need to observe the two K-value probe waveform of the site is more convenient. Of course, the use of digital ultrasound equipment to meet this requirement. In view of the popularization of digital ultrasound equipment in China is still a long period of time, so if we can achieve this in ordinary analog ultrasound instrument is of great practical significance. After exploration, we have been able to use this method in our work. A common simulation of the use of different analog value of the K-type probe method is now an actual workpiece as an example for a brief introduction. Workpiece structure shown in Figure 1, the weld width of 15mm, the probe front is 10mm. According to the process in the single-sided web with K2.5 and K1 probe were detected separately, and the other with a straight probe in the corresponding weld flaps flaw detection. Ultrasonic flaw detector using CTS-22A type, first K2.5 probe level by 1: 1 adjust the scanning speed to make DAC_ (K2.5) baseline