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根据T、K、Y管节点焊缝超声波探伤的技术特征,结合涠11-4平台上部结构建造的探伤实践以及试验研究,对工艺方法、缺陷定位定量方法以及验收标准等进行了较系统的分析与探讨。 1 探伤前准备工作 1.1 目视检查与尺寸测量 当探伤人员在接到焊接检查人员的超声波申请单以后,须检查工件的名称、编号、结构等是否符合申请内容,焊件应力延迟时间是否足够,并要求外观目视复查。复查的内容包括对探伤有影响的飞溅、油污清理情况,表面有无裂纹、锈蚀、表面焊渣、焊肉高度、咬边、超边、凹坑及烧穿等。 节点的实际尺寸往往与图纸的标准值有较大的偏差,探伤前必须实测。用超声波测厚仪在主、支管上分别选择四个位置(通常选择0、3、6及9点钟四个点),在每一个位置作出标记,测量三次后取平均值,分别予以记录并与图纸的数据相对照。不圆度的测取须借助专用设备。 1.2 探测面的标记与修整 1.2.1 焊缝根部的标记 在焊管坡口加工后尚未焊接前,对待扫查的构件应在离开根部的探测面上用划痕或打冲印的方法做标记,以保证焊后根部位置的准确。API标准中非常强调做这些标记,因为,在焊缝成形后通过其它方法对这些节点根部位置的测量将会很困难或不可能。离根部表面至划线或打印标记线的距离可任选,但应注意使标记离坡口边缘有
According to the technical characteristics of T, K and Y ultrasonic joints of joints, combined with the flaw detection practice and experimental study of the superstructure of 涠 11-4 platform, the methods, defect location and quantification methods and acceptance criteria were systematically analyzed And explore. 1 preparation before testing 1.1 visual inspection and measurement of dimensions When the inspectors received the welding inspector ultrasonic application form, it is necessary to check the name of the workpiece, number, structure, etc. are consistent with the application content, the weldment stress delay time is sufficient, And require visual review of the appearance. Review of the inspection include the impact of splash, oil clean-up, the surface cracks, rust, surface welding slag, welding height, undercut, ultra-edge, pits and burns and so on. The actual size of the node tends to deviate from the standard values of the drawings, and must be measured before the flaw detection. Ultrasonic thickness gauge in the main and branch were selected on four locations (usually 0,3,6 and 9 o’clock to choose four points), in each position to make a mark, measured three times and then averaged, respectively, to be recorded Contrast with drawing data. Non-roundness measurement to be with special equipment. 1.2 Marking and trimming of the probe surface 1.2.1 Marking of the root of the weld Before the weld bevel is machined, the member to be scanned shall be marked with a scratch or print on the detection surface leaving the root to Ensure the welding position of the root of the accurate. The API standard places great emphasis on these markings because it is difficult or impossible to measure the root location of these nodes by other methods after the weld has been formed. The distance from the root surface to the scribe or print mark line may be optional, but care should be taken to keep the mark from the bevel edge