CN103196994A - 一种交流磁轭法磁粉探伤中有效范围的测定方法 - Google Patents

一种交流磁轭法磁粉探伤中有效范围的测定方法 Download PDF

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CN103196994A
CN103196994A CN2013101103481A CN201310110348A CN103196994A CN 103196994 A CN103196994 A CN 103196994A CN 2013101103481 A CN2013101103481 A CN 2013101103481A CN 201310110348 A CN201310110348 A CN 201310110348A CN 103196994 A CN103196994 A CN 103196994A
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CN103196994B (zh
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刘长福
董国振
王强
赵纪峰
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Guodian Boiler And Pressure Vessel Inspection Co ltd
Guoneng Boiler And Pressure Vessel Inspection Co ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
Hebei Electric Power Construction Adjustment Test Institute
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Abstract

本发明公开了一种交流磁轭法磁粉探伤中有效范围的测定方法,其是用满足检测工艺最低要求的磁轭产生交变磁场后,将一个线圈放在所述交变磁场的有效检测区域内的最弱磁场位置,用电流表测量所述线圈中产生的电流;然后用未知性能的磁粉检测设备产生交变磁场,用线圈放置在该所述磁场中的某一位置,用电流表测量线圈中产生的电流,比较两侧测得的电流以确定交流磁轭法磁粉探伤中的有效范围。本发明方法操作简单,测量结果准确可靠。

Description

一种交流磁轭法磁粉探伤中有效范围的测定方法
技术领域
本发明涉及一种交流磁轭法磁粉探伤中有效范围的测定方法。
背景技术
磁粉检测是一种无损检测的重要方法,在很多行业中有广泛应用。交流磁轭法具有灵敏度高、容易退磁、容易实现多向磁化等诸多优点。其灵敏度对检测结果有很大影响。根据JB/T4730.4-2005规定,主要用不同类型的灵敏度试片测定灵敏度。各种灵敏度试片的厚度介于50~100μm之间,其长宽均不超过20mm,尺寸较小。在检定灵敏度时,需要进行固定,不够方便,且厚度很薄,容易折损。
发明内容
本发明所要解决的技术问题是提供一种测量简便、测量结果准确可靠地交流磁轭法磁粉探伤中有效范围的测定方法。
为解决上述技术问题,本发明采取的技术方案是:
一种交流磁轭法磁粉探伤中有效范围的测定方法,包括如下步骤:
(1)用满足检测工艺最低要求的磁轭产生交变磁场;
(2)将一个线圈放在所述交变磁场的有效检测区域内的最弱磁场位置;
(3)变换线圈摆放角度,用电流表测量所述线圈中产生的电流,记录最大电流值;
(4)用未知性能的磁粉检测设备产生交变磁场;
(5)用步骤(2)中所述线圈放置在步骤(4)所述磁场中的某一位置;
(6)用电流表测量步骤(5)中线圈中产生的电流的极大值;
(7)比较步骤(6)和步骤(3)中所测得的数值,若步骤(6)中所测得的数值小于步骤(3)中的数值,则步骤5中所测磁场在被测位置的磁场强度不满足检测要求;反之则满足检测要求,由满足检测要求的位置构成的区域即为交流磁轭法磁粉探伤中的有效范围。
本发明的检测原理为:
根据楞次定律,闭合回路中感应电流的方向,总是使得它所激发的磁场来阻碍引起感应电流的磁通量的变化
Figure 2013101103481100002DEST_PATH_IMAGE002
   (1)
式(1)中,各字母意义如下
E:感应电动势;
N:线圈匝数;
Φ:磁通量;
Figure DEST_PATH_IMAGE004
:磁通量变化率;
Figure DEST_PATH_IMAGE006
:磁感应强度变化率;
Figure DEST_PATH_IMAGE008
:闭合线圈面积变化率;
用于磁粉检测的设备使用工频正弦交流电,在线圈匝数和线圈面积一定的情况下,感应电动势仅与平均磁感应强度有关。因此通过比较感应电流可以用于比较平均磁感应强度。
本发明用于测定交流磁轭法磁粉探伤中的有效范围,具有操作简单、测量结果准确可靠的特点。
具体实施方式
本实施例包括如下步骤:
(1)用满足检测工艺最低要求的磁轭产生交变磁场;
(2)将一个线圈放在所述交变磁场的有效检测区域内的最弱磁场位置;
(3)变换线圈摆放角度,用电流表测量所述线圈中产生的电流,记录最大电流值;
(4)用未知性能的磁粉检测设备产生交变磁场;
(5)用步骤(2)中所述线圈放置在步骤(4)所述磁场中的某一位置;
(6)用电流表测量步骤(5)中线圈中产生的电流的极大值;
(7)比较步骤(6)和步骤(3)中所测得的数值,若步骤(6)中所测得的数值小于步骤(3)中的数值,则步骤5中所测磁场在被测位置的磁场强度不满足检测要求;反之则满足检测要求,由满足检测要求的位置构成的区域即为交流磁轭法磁粉探伤中的有效范围。

Claims (1)

1.一种交流磁轭法磁粉探伤中有效范围的测定方法,其特征在于包括如下步骤:
(1)用满足检测工艺最低要求的磁轭产生交变磁场;
(2)将一个线圈放在所述交变磁场的有效检测区域内的最弱磁场位置;
(3)变换线圈摆放角度,用电流表测量所述线圈中产生的电流,记录最大电流值;
(4)用未知性能的磁粉检测设备产生交变磁场;
(5)用步骤(2)中所述线圈放置在步骤(4)所述磁场中的某一位置;
(6)用电流表测量步骤(5)中线圈中产生的电流的极大值;
(7)比较步骤(6)和步骤(3)中所测得的数值,若步骤(6)中所测得的数值小于步骤(3)中的数值,则步骤5中所测磁场在被测位置的磁场强度不满足检测要求;反之则满足检测要求,由满足检测要求的位置构成的区域即为交流磁轭法磁粉探伤中的有效范围。
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CN107894456B (zh) * 2017-10-30 2021-04-20 共享铸钢有限公司 一种用于铸件整体磁粉检测的方法

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