High-takt main welding line ensures efficient vehicle manufacturing flow.
Body-in-white main welding line is the core assembly line in the welding shop. It is responsible for the final assembly and welding of the BIW body structure and is a key process that determines body accuracy, strength, and production capacity.

Mainstream Technical Solutions and Features.
——  Open-Gate final assembly technology: highly flexible with modular fixtures, suitable for mixed-model production lines.
——  Skid conveying system: high stability and positioning accuracy, well-suited for high-takt production.
——  Full robotic automation: reduces manual labor, ensures high consistency, and enables 24-hour continuous production.
——  Digital twin and error-proofing systems: VIN binding, parameter monitoring, and mistake-proofing alarms ensure welding quality and process reliability.

Key Quality Control Points

——  Weld point strength and quantity: typically thousands of weld spots per vehicle, requiring strict consistency and reliability.
——  Body dimensional accuracy: controlled at ±0.3 mm level, directly affecting assembly quality and wind noise performance.
——  Real-time monitoring of welding spatter, electrode wear, and fixture degradation to ensure process stability.
——  Complete traceability data system to meet IATF 16949 quality management requirements.

The main welding line is characterized by a high degree of automation, high welding precision, and stable cycle times; it primarily handles the welding of automotive underbody assemblies and body-in-white (BIW) assemblies. The entire process is automated via Programmable Logic Controller (PLC) control. Key components include robots, electrode dressers, water/air units (RIP and HIP), in-line conveyance systems, positioning fixtures, handling grippers, tool changers, servo-driven resistance welding guns, arc welding guns, automatic stud welding guns, SPR and FDS equipment, automatic adhesive application systems, automatic part-loading equipment (APC), line-side precision-positioning load/unload carts, and safety fencing.

Main Welding Line	Lower-Level Primary Body Fixture	Lower Body Fixture
Main Line Clamp	Lower Body Fixture