Casting is a type of component that has been used since ancient times, mainly reflected in daily use and manufacturing. Nowadays, in order to better develop the use of castings, non-destructive testing of castings is vigorously promoted. According to common belief, the main use of carbon steel precision castings nowadays is as machine parts and blanks, as well as some precision castings.
Non destructive testing is used to inspect the internal quality of castings. Therefore, we should pay attention to the characteristics of the castings themselves, which means that castings are generally coarse-grained, have complex shapes, and have large and small volumes and weights. The weldability of casting materials is different, especially for large castings, but excavation, welding, repair, and repair are also allowed. Non destructive testing personnel not only understand the relevant knowledge of Chinese casting material brand regulations, classifications, and characteristics, but also analyze and judge defects and quality issues, and have a very profound learning.
The casting process is prone to problems. Generally, in addition to chemical composition analysis and mechanical performance testing, non-destructive testing is also required. These testing requirements are based on design requirements, casting process requirements, or buyer requirements, using different inspection items to conduct non-destructive testing on castings.
It is recommended that enterprises determine the required inspection quantity for non-destructive testing of castings from the beginning when considering manufacturing, especially when producing the same products in large quantities. In some cases, it may be necessary to inspect castings separately, while in other cases, sampling inspections may be sufficient, especially for large castings, or only inspect important parts. In short, the goal is to meet the quality requirements of the design or demand side.
Castings are widely used in industries, agriculture, commerce, and other fields, accounting for 40-70% of agricultural machinery. Non destructive testing is a more convenient and efficient method for inspecting large castings.