2205双相不锈钢焊缝的超声检测应用  

Application of Ultrasonic Testing for Duplex Stainless Steel 2205 Weld

作　　者：邓军明 张东生 卢锦祥 DENG Junming;ZHANG Dongsheng;LU Jinxiang(Guangdong Chengxin Highway Engineering Inspection Co.,Ltd.,Guangzhou 511400)

机构地区：[1]广东承信公路工程检验有限公司,广州511400

出　　处：《公路交通技术》2020年第5期100-106,共7页Technology of Highway and Transport

摘　　要：双相不锈钢2205在超低温或高温的环境下也能够保证材料足够的韧性与强度,满足管道、海工桥梁等特殊场合条件下的安全使用,但其材料晶粒粗大,采用超声波检测内部质量时存在散射和声速指向性差的问题,影响检测结果评判。为解决上述问题,提出脉冲反射式超声波采用双晶纵波斜探头和自制对比试块调校进行检测。结果表明:1)双相不锈钢2205材料粗晶粒和各向异性导致信噪比下降,波束指向性差;2)双晶纵波斜探头最高反射声压在探头焦距标称值的1/2位置,以最高反射声压两端降低6 d B作为有效检测区域;3)利用双晶纵波斜探头及自制对比试块进行检测,通过射线与碳刨2种方法进行对比分析,超声波检测误差不超过3 mm,此方法是可行的。The duplex stainless steel 2205 can also ensure the toughness and strength of the material in ultra-low temperature or high temperature environmentto meet the safety use of pipeline,marine bridge and other special occasions.However,the coarse grains of duplex stainless steel 2205 lead to the problems of poor scattering and sound velocity directivity in ultrasonic testing,which will affect the evaluation of the test results.In order to solve the above problems,dual crystal longitudinal wave angle probe and self-made calibration of the reference block was proposed to testthe pulse reflection ultrasonic wave.The results show that:1)the coarse grain and anisotropy of duplex stainless steel 2205 lead to the decrease of signal-tonoise ratio and poor beam directivity;2)the maximum reflected sound pressure of the dual crystal longitudinal wave angle probe is 1/2 of the nominal focal length of the probe,and the effective detection area is to reduce both ends of the maximum reflected sound pressure by 6 dB;3)the dual crystal longitudinal wave angle probe and self-made reference block are used for testing,and the comparison analysis is conducted by ray and carbon planning methods.Its detection error is less than 3 mm,and the method is feasible.

关 键 词：A型脉冲反射式超声波 双晶纵波斜探头 对比试块 双相不锈钢2205 

分 类 号：U446.3[建筑科学—桥梁与隧道工程]