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众所周知,磁粉探伤作为铁磁性材料表面缺陷最有力的检测手段在检测工作中得到了十分广泛的应用。在锅炉、压力容器、压力管道及石化管件及一些大型构件的局部检测中一般采用磁轭法或旋转磁场法探伤,但对一些形状复杂或工件有一定批量的情况这种方法就显得效率不高和灵敏度不够,存在局部漏检现象。在无损检测工作中,经常会遇到一些特殊工件的无损探伤难以有效进行。比如对石化管件(如三通、四通等)、异型工件等的检测工作中,用上述方法探伤,除了效率低之外,因设备本身的局限性和工件结构的特殊性,对一些特殊重要部位无法进行有效的检测,容易造成漏检,在使用过程中存在安全隐患。在机械制造行业,很多复杂工件如曲轴、连
As we all know, magnetic particle inspection as the most powerful means of detection of ferromagnetic surface defects in the detection of the work has been very widely used. In the local testing of boilers, pressure vessels, pressure pipes and petrochemical pipe fittings and some large structures, magnetic yoke method or rotating magnetic field method is generally used for flaw detection. However, this method is not efficient for some complicated shapes or a certain batch of workpieces And the sensitivity is not enough, there is a partial missing phenomenon. In non-destructive testing, often encounter some special non-destructive testing of the workpiece is difficult to effectively carry out. For example, petrochemical pipe fittings (such as tee, Stone, etc.), special-shaped workpieces and other testing work, with the above method flaw detection, in addition to low efficiency, due to the limitations of the device itself and the particularity of the workpiece structure, for some special important The site can not be effectively detected, easily lead to missed inspection, there is a security risk in the course of use. In the machinery manufacturing industry, many complex parts such as crankshafts, and even