(1) All the test. In the whole process of product f […]
(1) All the test. In the whole process of product formation, all-in-one tests on the quality characteristics of all single color-coated, color-coated steel, color coated, colored steel coil and intermediate products were conducted. After the test, according to the test results for each (Taiwan) products to pass or not to determine the mouth of all the mouth test, also known as one hundred percent test.
The full test comes from the early industrialization, is a small-scale workshop-style production accustomed to the test method used. Although this method is original, it can effectively distinguish between qualified products and non-coated, colored steel, color coated, colored steel coil to prevent nonconforming products from being transferred to the next process (process) or delivered. Modern industrialized production, the production volume is very large, the quality of the tunnel characteristics of the change to the long process, take the initiative to measure and monitor CSMC device, all the quality characteristics of some of the tests (such as roller roller testing) , To ensure the quality of the final product.
The main advantages of full inspection: to provide a complete test data of aluminum plating and more adequate and reliable quality information The shortcomings of full inspection: the workload of inspection is relatively large, the inspection cycle is long, and the resources (manpower, material and financial resources) A large number of testing costs involved are also higher, increasing the quality and cost, may lead to a larger misdetection rate and missed inspection rate.
The full scope of application of the test: small quantities, varieties, important or high prices of products; manual work than the major, the site is not stable enough process (process); process capacity of the lack of operation process; Need to re-test the screening of products.
(2) Sampling test. Sampling inspection is a random inspection of a small number of individuals (consisting of two samples) from a batch or a process according to a prescribed sampling plan. Its purpose is to determine whether a batch of aluminized products or a process meets the requirements. The scope of application of sampling: some can not achieve full inspection of the test items (such as destructive testing, the use of chemical reaction experiments); production volume, high degree of automation, product quality and stability of the operation process; inspection fee expensive products A small number of standard connectors, such as screws, nuts, washers, etc., that are not intended to cause significant economic loss for general purpose use.
The main advantages of sampling inspection: Relatively full inspection greatly saves the inspection workload and inspection costs, shorten the inspection cycle, reducing the inspection staff, especially for destructive inspection, only the sampling test. The main shortcoming of sampling inspection is that there is a certain risk. Although modern statistical sampling methods greatly improve the scientificity and reliability than the old sampling methods (such as percentage sampling) due to the application of mathematical statistics, as long as they are sampling tests, There will be a wrong judgment of probability, to get 100% reliability is impossible.