The aluminum coil manufacturer will produce 5052 aluminum plates and inspect the finished products, which is the next process of aluminum plate production. According to the national standards, industry standards, enterprise standards, technical conditions, technical agreements and other provisions, the product size, surface, mechanical properties, process performance, etc. shall be comprehensively inspected and accepted to ensure the quality of 5052 aluminum plate products for users.
1. Check the size and surface of 5052 aluminum plate
After many processes of plate processing, various defects and waste are inevitable. For this reason, the dimensional accuracy and surface quality of the plate are checked first according to the relevant standards.
Use micrometer, micrometer, steel tape and other measuring tools to check the size deviation of the plate. The thickness and size of the plate, such as degree, width and length, shall be checked or sampled. If the size deviation exceeds the standard, the surface of the waste plate shall be smooth and clean, and the edge shall be free of burr, crack, angle break and bump. The surface defects must meet the standards, standards or technical conditions, and shall be smooth without scratches, scratches, etc.
In the salt bath quenching plate, in addition to visual inspection of whether there is trace of salt nitric acid on the plate, if necessary, 0.5% diphenylamine concentrated sulfuric acid drop plate can be used for inspection. If the water drops into dark blue after a period of time, it means that there is a trace of salt nitric acid.
Methods to check the surface quality and the flatness of the test plate is the testing platform. First, check the surface of the plate with the naked eye to see if there is any defect beyond the standard, and then check the gap between the plate and the platform. If the plate does not exceed the standard, it is a qualified finished product. One side of the qualified plate shall be printed with alloy brand, national code, thickness, batch number, serial number and qualified inspection seal.
2. Check the structure and performance of 5052 aluminum plate
In order to test the mechanical properties and complete the internal organization and technical characteristics of the plate, a certain number of samples shall be tested from each batch of products according to the standards and technical requirements, so as to ensure that the quality of the plate meets the product standards and the needs of users.
According to different alloy States, 2%, 5% and 10% samples are selected for each batch of plates, and 100% of key products are tested for mechanical properties. When the mechanical property test result of a sample fails, twice the number of samples shall be cut from the plate of the rejected sample, and the test shall be repeated. If one sample still fails in the repeated test, the plate shall be scrapped. The supplier can recheck the plate spacing represented by the unqualified samples one by one. The qualified ones shall be delivered and the unqualified ones shall be invalid.
For quenched plates with important use, samples shall also be taken for metallographic inspection, and all of them shall be scrapped in case of overburning. Some products can also be inspected for aluminum coating, grain size, plate delamination and internal defects by ultrasonic according to the relevant provisions of technical standards. According to the requirements of the standard, it can be accepted and delivered only after passing the inspection.
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