High-Speed String Welding Machines: The Backbone of Modern PV Module Manufacturing

As the solar industry accelerates its march toward higher efficiency and larger scale, equipment innovation has become the key driver of progress. Among all the machines on a photovoltaic (PV) module production line, the string welding machine—often called the “neurosurgeon” of the module circuit—plays a decisive role in shaping module quality, yield, and long-term reliability.                          

Why String Welding Matters

The core function of a stringer is to interconnect individual solar cells into continuous strings with precision and minimal defects. In today’s market, where multi-busbar (MBB) and half-cut cell technologies dominate, string welding machines must ensure both speed and accuracy while keeping thermal stress under strict control. Advanced models achieve welding speeds above 6,000 cells per hour, with false welding rates below 0.3%, setting new standards for efficiency.

Temperature uniformity is another critical factor. Modern equipment integrates infrared preheating and dynamic impedance monitoring, ensuring that the welding temperature gradient stays within ±3°C—crucial for reducing microcracks and improving module durability.

From Precision to Flexibility

As wafers transition from 166 mm to 210 mm and beyond, string welding machines have evolved into highly adaptable platforms. Innovative solutions such as backside-up welding enable compatibility with multiple wafer formats, while AI-assisted vision systems detect defects in real time. This convergence of speed, precision, and adaptability makes the stringer one of the most strategically important assets on any PV production line.

Our Company’s Contribution

At ChinTiyan New Energy, we provide a complete portfolio of string welding solutions, covering both high-speed and low-speed models for different production requirements. Our equipment supports Back Contact (BC) technologies as well as conventional cell types, helping manufacturers strike the right balance between cost, throughput, and long-term performance. By focusing on reliability and scalability, ChinTiyan New Energy ensures that our customers are prepared for the next wave of large-scale solar manufacturing.

Equipment Spotlight

The CTM-60BC High-Speed BC Stringer is an automated production equipment specifically designed for BC cell stringing, compatible with 166-230 (3BB-20BB) cells. it can produce BC cell strings insizes 166-230 (half-cel, 1/3-cell). The equipment utilizes advanced automation technologies including PLC, servo motors, linear motors, four-axis industrial robots, and machine vision to achieve fully automated processing from cell loading to cell string output. Whether applied to BC solar cells, or mainstream TOPCon, this string welding machine provides manufacturers with a stable and future-ready platform for scaling production.