应用超声导波于管在线焊接支撑架之腐蚀检测.pdfVIP

应用超声导波于管在线焊接支撑架之腐蚀检测 李秉鸿，黄启贞，邱显裕，陈鸿铭 (台湾金属材料品管有限公司，台湾) 摘 要：石化厂中的管线检查是很重要的，一般无损检测法如传统超音波点对点的量测，虽可检 测出管壁厚度的变化，但要使用此方法检查厂区内动辄绵延几公里的管线几乎不可行。超声导波检测 法克服了上述问题，此技术运用环状数组探头于管在线激发与接收圆管导波，可进行长距离大范围的 管线检测，根据回波讯号判别出管线腐蚀位置所在。然而，长距离管线在每隔几公尺便会采用支撑架 来支撑管线，避免管线弯曲、振动而降低管线寿命。支撑架有许多类型，例如常见的简支撑架、焊接 式支撑架或夹持式支撑架，在采用导波法进行检测时，这些支撑架往往会产生反射回波讯号与腐蚀之 回波讯号混迭在一起，造成检测人员难以检测出支撑架区的管壁腐蚀。为了解决这扰人的问题，本文 探讨焊接支撑架对导波检测时的影响，研究发现纵向焊接支撑架与周向焊接支撑架对导波反射讯号具 有不同特性。 关键词：超声导波；管线支撑架；无损检测 The Application of Ultrasonic Guided Wave on Welded Support Corrosion Inspection on Pipes LEE Ping-Horn, HUANG Chi-Jen, CHIU Hsien-Yu, CHEN Hong-Ming (Taiwan Metal Quality Control Co., Ltd., Kaohsiung, Taiwan) Abstract: Pipeline inspection is important in petrochemical plants. Generally non-destructive testing methods such as conventional ultrasonic testing, though can detect changes in wall thickness, but it is almost impossible to check the long pipeline using this method. Ultrasonic guided wave inspection overcomes the above problems. Using the transducer array for guided wave excitation and detection makes guided wave inspection cover a long-length of pipeline. The reflected signals are used to determine the corrosion location and size on the pipe. However, there are many welded supports on the pipe induce the difficulty of guided wave inspection. Therefore, we study both the effects of the longitudinal and the circumferential welded support on guided wave propagation. Keywords: ultrasonic guided waves; welded support; non-destructive testing 30 1 前言 石化工业、发电厂、钢铁厂与自来水厂等产业中，许多管线都在恶劣的工作环境下使用，容易因为自 然与人为因素造成管线变形、生锈或腐蚀等不同型态的缺陷，最