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See Chinese contents: GB/T 41856.1-2022 GB/T 41856.1-2022: Non-destructive testing - Industrial endoscopy visual testing - Part 1: Method
This document specifies the method principle, environmental requirements, personnel requirements, testing system, testing, result evaluation, and testing report of industrial endoscopy (hereinafter referred to as endoscopy) visual testing. This document is applicable to the testing and evaluation of the inner surface state and internal structure of metal or non-metal parts and assembly components of industrial products.
