Consideration before choosing the proper crack detection method
One detection method can not fit every circumstance, each of the crack detection device have it’s limit. Before choosing one detecting method, the following should be counted into consideration, such as object material, structure, size and shape. Also it’s better to predict the shape of crack, which part of object or direction of the flaw may exist. Each detection method have it’s own advantage and disadvantage. These consideration will help people choosing the method of crack detection. For example, crack detection for steel plate, because of the direction of metal grain extension is parallel to the surface of the steel plate, it is not proper to use X ray detection, instead, the ultrasonic detection method is better.