The positioning principle of welding fixtures is to fix the workpiece on the fixture body through positioning elements to ensure that it maintains the correct position and posture during the welding process. Common positioning principles include point positioning, line positioning and surface positioning.
Point positioning: Use positioning pins or positioning blocks to cooperate with positioning holes or positioning surfaces on the workpiece to achieve point-to-point positioning. This positioning method is suitable for situations where high-precision positioning is required, such as welding precision instrument parts.
Line positioning: Line-to-line positioning is achieved by arranging positioning elements along the lines on the workpiece. Line positioning is suitable for situations where the straight nature of the workpiece needs to be maintained during welding, such as welding pipes and frame structures.
Surface positioning: Use positioning tables or positioning blocks to cooperate with the plane on the workpiece to achieve face-to-face positioning. Surface positioning is suitable for situations where the flatness of the workpiece needs to be maintained, such as welding flat plates and box structures.
The design and application of welding fixtures are not limited to ensuring the size of weldments and improving assembly accuracy and efficiency, but also include adapting to workpieces of different types and sizes, and resisting vibrations and forces during welding to reduce errors during welding. In automobile manufacturing, welding fixtures play a particularly important role. They need to be able to stably fix body parts to ensure welding accuracy while adapting to the needs of different models and production stages.