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目前用磁粉、渗透等无损检查方法可以很简便地发现金属零件的表面裂缝,但不能精确地测定裂缝的深度。超声波可以探测表面裂缝的深度,但是受到工件几何形状,表面光洁度的影响,而且对于深度只有几个毫米的表面裂缝测量误差很大。放射线确定表面裂缝深度是相当困难的。涡流方法受到很多因素的影响,而且测量深度浅。用直流电导方法可以很简便、可靠地测量表面裂缝深度,而且很少受工件形状,表面状况以及裂缝实际深度大小的限制,因此,在某些情况下,可用于测量钢板腐蚀层的厚度,管子壁厚等方面具有其他无损方法所没有的技术经济效果。
At present, non-destructive inspection methods such as magnetic powder and infiltration can easily find the surface cracks of the metal parts, but can not accurately measure the depth of the cracks. Ultrasonic can detect the depth of surface cracks, but by the workpiece geometry, surface finish, but also for the depth of only a few millimeters of surface cracks measurement error. Radiation to determine the depth of surface cracks is quite difficult. The eddy current method is affected by many factors, and the depth of measurement is shallow. Direct current conductometry can be used to measure surface crack depths easily and reliably, and is less limited by workpiece shape, surface condition, and actual depth of fracture, and therefore, in some cases, can be used to measure the thickness of the steel corrosion layer. Wall thickness and other non-destructive methods have no technical and economic effects.