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See Chinese contents: GB/T 34370.4-2017 GB/T 34370.4-2017: Nondestructive testing of amusement equipment -- Part 4: Penetrant testing
This Part of GB/T 34370 specifies the penetrant testing method and quality grading requirements for amusement equipment. This Part applies to the testing of surface opening defects in non-porous metallic or non-metallic materials, parts, and welded joints of amusement equipment.
