论文部分内容阅读
本文介绍的厚焊缝,是指厚度在100～250毫米之间的焊缝。其中有些探伤问题在中等厚度焊缝和大型锻件探测中也会同样存在。大厚度工件与薄型工件探伤的基本差别,在于前者声程要大得多。因此,超声波折射角的变动、声束的扩散、缺陷方向的不同等,将会显著地影响探测结果。另外,在薄焊缝中返修问题不大,但在厚焊缝中要铲除埋藏得较深的缺陷并予修补,就远不是那么简单。所以必然会对仪器和探头的性能、探伤的方法,提出严格得多的要求。方法目前焊缝探伤一般采用折射角比较合适的单斜探头脉冲反射法,它对于薄焊缝中的危险性缺陷(方向垂
This article describes the thick weld, refers to the thickness of the weld between 100 ~ 250 mm. Some of these flaw detection problems are also present in medium-thickness welds and large forgings. Large thickness of the workpiece and thin workpiece flaw detection of the basic difference is that the former sound path is much larger. Therefore, the change of ultrasonic refraction angle, the diffusion of sound beam, the different direction of defects and so on, will significantly affect the detection results. In addition, rework in thin welds is not a problem, but it is far from easy to eradicate the deeper buried defects in thick welds. So it is bound to the instrument and the probe’s performance, testing methods, put forward much stricter requirements. Methods At present, the flaw reflection method of single-angle probe with suitable refraction angle is suitable for the weld flaw detection. It is very suitable for the dangerous flaw in the thin weld