Spot welding (resistance welding) is a foundational process in automotive manufacturing. By applying pressure through electrodes and passing high current through workpieces, localized melting occurs via contact resistance heat to form a weld nugget. Its core advantages include high efficiency, low cost, ease of automation, and a small heat-affected zone. A single weld takes only 0.1–2 seconds, requires no filler materials, has low operating and maintenance costs, and is readily adaptable to robotic automation. As the most widely used welding process in body-in-white manufacturing, a single new energy vehicle body contains 3,000–5,000 spot welds, which directly determine structural strength and rigidity. Compared with laser welding, arc welding and other processes, spot welding offers irreplaceable cost and efficiency advantages in thin-sheet joining and mass production, making it an essential foundational process for new energy vehicle manufacturing.

In new energy vehicle manufacturing, spot welding has become critical for body structure and battery production. For steel-aluminum hybrid bodies, Eunice’s spot welding system is compatible with high-strength steel, aluminum alloy, galvanized steel and other lightweight materials. To address the challenge of welding dissimilar steel and aluminum materials that conventional spot welding struggles with, the system optimizes electrode force, current waveform and welding time to achieve stable nugget formation, ensuring the strength of key load-bearing structures such as A-pillars, B-pillars and rocker beams to meet global crash safety standards. For battery module and PACK production, the system specializes in spot welding of busbars, tab connectors and module frames. Using medium-frequency inverter DC technology, it delivers low heat input and a small heat-affected zone, avoiding over-melting and deformation of copper and aluminum materials, ensuring stable electrical conductivity and structural reliability, and supporting cylindrical, prismatic and pouch-type battery modules.

Automated core equipment forms the foundation of Eunice’s spot welding solution. Centered on high-precision 6-axis industrial robots, the system integrates servo spot welding guns, medium-frequency inverter power supplies and intelligent monitoring modules to form standardized automated welding cells. Servo guns provide closed-loop precision force control with fluctuation ≤ ±1%, adapting to various sheet thicknesses and dissimilar materials. Medium-frequency inverter power supplies offer millisecond-level response and current control accuracy of ±3%, effectively suppressing spatter and improving nugget stability. The system features real-time weld quality monitoring by collecting current, voltage and force data, enabling instant quality judgment and automatic alarm for abnormalities to prevent defective parts from proceeding. The robotic spot welding system can be flexibly integrated into body-in-white and battery module production lines, supporting multi-model and multi-specification collinear production with up to 100% automation, greatly enhancing flexibility and efficiency.

The core value of Eunice’s spot welding solution lies in three strengths: integrated R&D, industry-university-research collaboration, and full-process service. In integrated R&D, the company offers full-chain capabilities from process design, equipment development and system integration to commissioning and delivery, and can customize exclusive automated spot welding solutions based on layout, specifications and cycle-time requirements for perfect equipment-process-line matching. Through industry-university-research collaboration, Eunice maintains long-term partnerships with domestic universities, focusing on quality control algorithms, dissimilar material welding and lightweight material adaptation to continuously optimize welding parameter libraries and enhance compatibility with new materials and processes. For full-process service, the company provides one-stop support from installation, commissioning and training to after-sales maintenance and process upgrades. With offices in Suzhou and Shanghai, it offers rapid response across East China; a global service network supports worldwide customers, and 7×24-hour technical support ensures stable line operation and full customer peace of mind.

Amid the lightweight, intelligent and large-scale development of new energy vehicles, spot welding remains a core pillar of joining technology. Eunice’s robotic spot welding system solves industry pain points through technological innovation, secures body safety via quality assurance, and helps customers reduce costs and improve efficiency with full-process service. From structural body welding to precision battery module joining, Eunice empowers the full value chain of new energy vehicle manufacturing with professional expertise. Every stable weld supports quality upgrading and industrial innovation, driving new energy intelligent manufacturing to higher levels through the craft wisdom of turning “spots” into strength.