不锈钢焊缝缺陷尺寸的超声波探伤定量研究
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摘要
为了确定不锈钢焊缝中缺陷的尺寸,对直径分别为1、2和3 mm,长度分别为1、2、3、4、5和6 mm的不锈钢试样中的横通孔进行了超声波探伤。在探伤过程中,记录每组横通孔的回波高度达到基准波高时的增益值(用分贝d B表示),随后绘制出相应的AVG(A-距离,V-波幅,G-当量)曲线,并对该曲线的变化规律进行了分析研究。试验验证表明,该AVG曲线可以用来对不锈钢焊缝中直径当量为Ф1～3 mm的缺陷的尺寸进行定量。
In order to determine size of defects in stainless steel weld,cross through holes in stainless steel specimens,having as dimension as 1 mm,2 mm and 3 mm in diameter by 1 mm,2mm,3 mm,4 mm,5 mm and 6 mm in length,respectively,were subjected to ultrasonic testing. In ultrasonic testing,gain values of the each group of cross through holes were recorded when their echoheight reached a standard wave height,being represented by decibels dB. Subsequently,AVG( Adistance,V-amplitude,G-equivalent) curves were drawn,and their change was investigated,too.From the experimental verification it was seen that the AVG curves can be used to quantify size of defects equivalent to 1-mm-to 3-mm-diam in stainless steel weld.
In order to determine size of defects in stainless steel weld,cross through holes in stainless steel specimens,having as dimension as 1 mm,2 mm and 3 mm in diameter by 1 mm,2mm,3 mm,4 mm,5 mm and 6 mm in length,respectively,were subjected to ultrasonic testing. In ultrasonic testing,gain values of the each group of cross through holes were recorded when their echoheight reached a standard wave height,being represented by decibels dB. Subsequently,AVG( Adistance,V-amplitude,G-equivalent) curves were drawn,and their change was investigated,too.From the experimental verification it was seen that the AVG curves can be used to quantify size of defects equivalent to 1-mm-to 3-mm-diam in stainless steel weld.
引文
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[2]冯挺,姚欢.超声波检测中两种定量方法的比对研究[J].中国石油和化工标准与质量,2013(20):20-21.
[3]王小保.服役管线焊缝缺陷的超声定量检测技术研究[D].西安:西安石油大学,2011.
[4]姚志忠.中薄板焊缝超声波探伤缺陷定量探讨[J].造船技术,1980(6):27-34.
[5]于建华.数字式超声波探伤仪横波斜探头时基线的精确调试方法[J].无损探伤,2010,34(3):22-24.
[6]张春雨,杨春雷.钢管混凝土缺陷超声波定量检测技术初步研究[J].公路交通技术,2012(2):67-70.
[7]曹福想,郭少宏,郑文江,等.不锈钢复合钢板对接焊缝超声检测[J].中国特种设备安全,2017,33(2):31-35.
[8]梁志雄.关于金属结构焊缝超声波探伤方法的探讨[J].建材发展导向,2017,15(6):68.
[9]曹刚,朱思民.焊缝超声波检测回波信号分析[J].无损检测,2004,26(10):533-536.
[10]李江,李日新.船舶焊接常见缺陷的成因及防止措施研究[J].中国水运月刊,2011,11(5):83-84.