Why can’t radiation be used for raw material testing?
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According to non-destructive testing standards, RT testing is applied to welds and castings, while UT is applied to raw materials and welds. May I ask, why can’t radiation be used for testing raw materials? Couldn’t a simple X-ray scan suffice? 2. Why can’t UT testing be used for castings? Thank you
Carefully study the features, operations, etc. of RT and UT, and consider the cost-effectiveness. Then such a question wouldn’t be raised.
Each testing method has its limitations; the choice of a testing method depends on the properties of the material, the likelihood of the problem, and the conditions under which the method will be used. RT is not suitable for detecting defects in raw materials, such as delamination and white spots
How many sheets do you need to stick on one board?
I’ve never seen how RT is done; could you explain it? Due to safety concerns, they don’t allow visits to the factory either
RT: Conventional types are divided into 2 categories: based on 192, X-ray
Castings and forgings are both raw materials; due to different processing methods, they have different defects, which is why different NDE methods are employed
Raw material inspection can be carried out using radiation, but there are issues related to the time required for inspection as well as manufacturing costs. From taking photos to developing them and evaluating the results, it takes several days to complete the process for a single sheet of material. For material suppliers, it’s of course better to save money as much as possible. The main reason is that the manufacturers of raw materials are responsible for the accuracy of the quality certificates associated with their products; considering economic factors, UT is the preferred method. Additionally, in terms of inspection angles, when conditions permit, the accuracy of UT and RT inspections is roughly the same, and UT is also easier to implement. The surface of castings is in its as-cast state; the surface finish of ordinary castings does not meet the requirements for UT testing. Moreover, it is difficult to control the time required to prepare the casting surface for UT testing. Since castings are often large or complex in structure, there are angular constraints associated with ultrasonic testing, meaning that ultrasonic echoes cannot be received from certain areas, which makes it hard to ensure accuracy. Under such circumstances, RT testing proves to be a more suitable option
If it’s a high-end model and the cutting time permits, of course UT is an option.