GB/T 34370.6-2017: Translated English of Chinese Standard (GBT 34370.6-2017, GB/T34370.6-2017, GBT34370.6-2017): Nondestructive testing of amusement equipment - Part 6: Radiographic testing
https://www.chinesestandard.net, 18.6.2019 - 41 sivua
This Part of GB/T 34370 specifies the X-ray and -ray testing techniques and quality grading requirements for the fusion welded butt joints of amusement equipment. This Part applies to the radiographic testing of carbon steel, low alloy steel, and stainless steel butt welded joints of amusement equipment with a thickness of 2 mm~200 mm.
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Testing process specification
Appendix A Informative Schematic diagrams of typical penetration methods
Normative Calculation method of focus size
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according amusement equipment austenitic backing plate backscatter protection base metal block for incomplete bundle of rays butt girth welded butt joint comply composite rating concavity and root cumulative length digital radiography double-wall double-image penetration effective focus elliptical imaging exposure curve film evaluation scope film side flaw evaluation area focal distance GB/T girth welded joint Grade III Note Grading evaluation Greater than Grade groove reference block image quality indicator incomplete fusion indicator is placed Lead Lead Lead meets the requirements minimum nominal thickness Nomogram Non-destructive testing number of penetrations one-sided welding overlap mark penetrated position penetrated thickness K=1.1 penetration arrangement penetrations with ratio piece under test provisions of Table quality grade radiographic testing ratio of max ray energy root concavity root undercut round flaws Schematic diagram special image quality special reference block testing process specification thickness K=1.2 total length tube’s nominal diameter visual acuity welded joint Figure welding without backing width