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See Chinese contents: GB/T 43403-2023 GB/T 43403-2023: Road vehicles -- Trailers up to 3.5t -- Control of welded towing brackets for coupling ball after fatigue testing
This document specifies the aim and principles, personnel requirements, choice of method, testing requirements, and result determination for the control of mechanical coupling devices between the towing vehicle and the light trailer equipped with coupling devices that comply with GB/T 25988 after fatigue testing. This document is applicable to all the components of the mechanical coupling devices whose failure can cause the fracture of the attachment, manufactured out of steel, forged steel or cast steel (i.e., generally in ferromagnetic materials). Note: In the case of use of other materials, the manufacturer will check their compatibility with the methods of non-destructive testing.
