Random sampling to check if the fastener meets the corresponding product standard
The qualification test is the type test of the newly developed fasteners. The purpose of the test is to verify whether the design and manufacturing conditions of the fasteners can fully meet the requirements of the corresponding product standards. The identification test and test are carried out by the supplier of the product, and the result needs to be approved by the relevant appraisal agency as a basis for determining whether the batch can be produced. Therefore, all the requirements specified in the standard should be tested and tested. The qualification test shall be carried out before the fastener is officially produced. When the material of the fastener, the structural size of the fastener, the main process and production conditions change, and the production resumes after a period of production stoppage, the inspection shall be re-examined. At the time of the identification test, the samples of the identification test shall be randomly selected from the trial production batch, and the sample quantity is generally fixed and specified by the corresponding standard. Since the qualification test is not specific to the production batch and cannot be used to determine the eligibility of the inspection lot, the inspection result does not have the problem of receiving or rejecting the inspection lot.
Quality consistency inspection Quality consistency inspection is also called settlement inspection and factory inspection. The purpose of the test is to use as simple as possible a method that is both economical and reflects actual use, and randomly samples the fasteners to meet the corresponding product standards, as a basis for determining whether the batch can be accepted. Generally speaking, the quality consistency inspection project is less than the qualification inspection, but for the fasteners with less inspection items and simple test, the items of the two inspections can be identical. In this case, a quality consistency test can be used instead of an identification test. The quality consistency check is performed by the fastener manufacturer, which is responsible for the quality of the fasteners. Although certain project standards require only qualification testing and no quality consistency testing, manufacturers should be responsible for the eligibility of these projects.
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