What is BIW and 321 principle

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BIW stands for Body in White, which refers to the stage in automotive manufacturing when a car body's sheet metal components have been welded together but before painting. The 3-2-1 principle is a method used in fixture design to ensure accurate and repeatable positioning of parts during welding or assembly.

BIW stands for Body in White, which is the stage in automotive manufacturing when a car body's sheet metal components have been welded together but before painting.
The 3-2-1 principle is a method used in fixture design to ensure accurate and repeatable positioning of parts during welding or assembly.
In the 3-2-1 principle, three points are used to locate the part, two points are used to constrain the part, and one point is used to accurately position the part.
For example, in welding a car door to the car body, the 3-2-1 principle would involve using three locating pins, two clamps, and one reference point to ensure the door is positioned correctly for welding.

What is BIW and 321 principle

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