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锅炉压力容器等热力设备处于高温、高压、高应力、大载荷的工作状态,通常其内在介质均为易燃、易爆物质,具有一定的腐蚀性.有些应力集中系数高、结构强度较薄弱的部件,在运行过程中极易形成裂纹和加速裂纹的扩展,最后导致部件的开裂、设备的爆破.因此,锅炉压力容器这类经常受到反复应力影响的设备,除了用射线和超声检测内部缺陷外,还需要对焊缝进行表面和近表面缺陷的检测.由于磁粉检测缺陷显示直观、灵敏度高、检测速度快且成本低廉等优点,因此,采用磁粉检测铁磁性材料表面和近表面缺陷是一种比较有效的检测方法.
Boiler pressure vessels and other thermal equipment in high temperature, high pressure, high stress, high load working conditions, usually the internal media are flammable and explosive substances, has a certain corrosive.Some stress concentration coefficient, structural strength is weak Components that can easily form cracks and accelerate crack propagation during operation and eventually lead to component cracking and equipment bursting.Thus, equipment such as boiler pressure vessels, which are often subjected to repeated stresses, except for the detection of internal defects by radiation and ultrasound , But also need to weld the surface and near surface defects detection.Due to magnetic particle detection defects show intuitive, high sensitivity, fast detection and low cost, etc. Therefore, the use of magnetic particle detection of ferromagnetic surface and near surface defects is a More effective detection methods.