For the standard parts in the visible area, follow the following principles: ● choose silver fasteners when matching with aluminum parts and light-colored parts; ● select black fasteners when matching with black and dark-colored parts; ● if there are multiple colors, Fasteners are black.
The size from the head of the bolt to the scraping indentation must be greater than the thickness of the plate + the height of the welding nut welding foot and the sheet metal welding + the height of the welding nut + the thickness of the paint layer + the thickness of the ground iron under the calculation of the tolerance chain, so as to ensure the reliability of the electrical conductivity. , Volkswagen and other European models use welding grounding kits and anti-rotation plastic parts combination kits, and American cars use welding common stud grounding and other structures. The author uses the same standard for various grounding methods. Test, the test result is that the voltage drop of various grounding irons is the same, and the electrical properties of various grounding irons are similar, but each grounding iron has its inherent advantages and disadvantages in terms of manufacturability and maintainability. to make a selection.