锆合金浅焊缝熔深超声显微检测技术研究  

Measuring Weld Penetration of Zirconium Alloy Shallow Welds via Scanning Acoustic Microscopy Technology

作　　者：任俊波[1] 唐月明[1] 王学权[1] 柴玉琨[1] 许贵平[1] 

机构地区：[1]中国核动力研究设计院核燃料循环与材料重点实验室,成都610041

出　　处：《材料导报（纳米与新材料专辑）》2015年第1期80-82,共3页

摘　　要：核电站燃料元件中采用了大量锆合金材料，燃料元件常采用电子束焊接方式连接，其中某些焊缝熔深为800-1000μm，属于浅焊缝熔深，焊后利用无损检测方式进行焊缝熔深检测。焊缝熔深检测常用的无损检测方法为超声法，但由于盲区、灵敏度及分辨力等原因，对于小于1mm的焊缝熔深无法达到很高的检测精度，为此通过调研提出了一种新的焊缝熔深检测技术——超声扫描显微（SAM）技术。该技术具有检测频率高、盲区小、灵敏度高以及分辨高等特点。对SAM检测焊缝熔深进行了理论分析，并利用实验样品开展了SAM焊缝熔深检测技术研究，经过实验与金相解剖结果比较表明利用SAM技术，采用频率为100MHz的专用探头可以检测800-1000μm的锆合金焊缝熔深，测量精度达到30μm。Plenty of zirconium alloys have been used in the fuel assemblys of nuclear power plants. The component units of fuel assemblys were connected with electron been welding methods. The depth of some structurest weld penetration is required between 800 μm to 1000 μm which is shallow weld. The weld penetration is required to be measured with NDT methods. The usual method to measure the weld penetration is ultrasonic testing. However because of the blind area, sensitivity and reosolving ability, the ultrasonic testing method can＇t reach the accuracy to satisfy the accuracy requirement. So a new method-scanning acoustic microscopy （SAM for short） was investigated. The SAM technology has the personality of high inspection frequency, small blind area, high sensitivity and strong resolving ability. The theory of using SAM to measure the weld penetration has been analysed. Laboratory samples have been made to carry on the research of SAM inspection technology. According to the comparing results of SAM experimental datas and the samplesr metallographic examination results show that SAM technology is available to measure the weld penetrations between 800μm to 1000μm and the accuracy reaches 30 μm.

关 键 词：超声扫描显微 锆合金 焊缝熔深 

分 类 号：TB303[一般工业技术—材料科学与工程]