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Modern metro networks depend on stable electrical grounding to ensure operational safety, equipment protection, and uninterrupted service. As rail systems expand and electrical loads increase, selecting durable and highly conductive grounding materials becomes essential. Sunlightweld copper bonded tape is engineered as a bimetallic composite combining a high-strength steel core with a corrosion-resistant copper exterior. This structure delivers both mechanical durability and excellent electrical conductivity, making it well suited for large-scale grounding grids.
Already deployed in major metro systems across China—including Chongqing, Shenzhen, Wuhan, and Hangzhou Metro Line 1—Sunlightweld copper bonded tape has also been widely applied in petrochemical and civil aviation projects. Notable applications include the Algeria Condensate Project (5 million tons annual output), the SORALCHIN Adrar Refinery Project, Jinan Yaoqiang International Airport (Phase II Expansion), and Shanghai Pudong International Airport (Phase IV Expansion), demonstrating reliable performance across diverse and demanding environments.
Why Copper Bonded Tape Matters in Metro Grounding Systems
Metro environments present complex electrical challenges. Traction currents generate electromagnetic fields, underground structures are frequently exposed to moisture and stray currents, and extensive rail networks require grounding systems capable of delivering stable performance across large coverage areas. Under these demanding conditions, selecting the right conductor becomes critical to maintaining operational safety and electrical reliability, which is why copper bonded tape has become an increasingly important solution in modern metro grounding design.
Traditional grounding conductors often struggle to achieve an ideal balance between conductivity, mechanical strength, and long-term corrosion resistance. Sunlightweld copper bonded tape addresses these requirements through a dual-metal structure that integrates a high-strength steel core with an outer copper layer. This design allows copper bonded tape to provide strong tensile performance during installation while maintaining excellent electrical conductivity once deployed. The copper surface also enhances corrosion resistance, helping the conductor perform consistently despite exposure to moisture, soil chemicals, and temperature fluctuations.
Because copper bonded tape combines structural durability with efficient current dissipation, it can better withstand soil pressure, mechanical stress, and thermal cycling without compromising the electrical path. For metro operators, adopting copper bonded tape supports safer stations, more reliable signaling systems, and reduced long-term maintenance—key advantages for transportation networks that must operate continuously in challenging urban environments.
Technical Parameters of Sunlightweld Copper Bonded Tape
Sunlightweld focuses on delivering measurable performance through controlled manufacturing processes and precise engineering standards. Designed for demanding grounding environments such as metro systems, petrochemical facilities, airports, and power infrastructure, Sunlightweld copper bonded tape combines structural durability with reliable electrical conductivity, helping infrastructure maintain stable long-term performance.
Engineered Copper Layer for Extended Service Life
One of the defining characteristics of copper bonded tape is the thickness of its copper layer, which directly influences corrosion resistance and operational lifespan. Sunlightweld manufactures copper bonded tape with a copper thickness ranging from 0.254 mm to 0.8 mm, fully customizable according to project requirements. While 0.254 mm represents the commonly accepted international baseline, Sunlightweld is capable of exceeding this standard, offering options up to 0.8 mm.
A thicker copper surface improves resistance to underground corrosion and electrochemical reactions, making it particularly advantageous for metro installations where conductors are continuously exposed to moisture, soil pressure, and fluctuating temperatures.
Dual International Certification for Greater Project Confidence
Sunlightweld copper bonded tape complies with both IEC 62561 and UL standards, positioning the company among a relatively small group of manufacturers capable of meeting dual certification requirements. Many suppliers provide only UL-certified products, but dual compliance strengthens acceptance in internationally funded rail projects and simplifies the approval process for contractors and consulting engineers.
Certification not only validates product performance but also reduces procurement uncertainty, allowing project teams to specify materials with greater confidence.
Factory-Controlled Manufacturing Advantage
Sunlightweld operates its own production facility, giving the company direct oversight of quality, scheduling, and process consistency. This vertically integrated structure supports factory-direct pricing while maintaining strict supervision across every production stage. For large metro projects operating under tight timelines, dependable supply and consistent product quality are critical, and factory manufacturing helps eliminate delays often associated with intermediary sourcing.
Mechanical Reliability for Demanding Installations
Grounding conductors in metro environments must tolerate continuous vibration from train movement, installation stress, and long-term soil pressure. Copper bonded tape from Sunlightweld is engineered to meet these demands, offering tensile strength ranges of approximately 350–770 MPa for vertical grounding and 60–510 MPa for horizontal grounding. These values provide flexibility across different installation geometries while preserving structural integrity throughout the conductor’s service life.
Equally important is ductility. Sunlightweld copper bonded tape demonstrates strong plasticity, remaining intact even after three consecutive 90-degree bends without visible cracking along the copper edges. This resilience supports safer handling during installation and reduces the likelihood of conductor damage on site.
Continuous Electroplating and Molecular Bonding
Sunlightweld produces its copper bonded steel conductors using a continuous electroplating process that deposits copper directly onto the steel core. This method creates a permanent molecular bond between the metals, preventing separation over time and ensuring consistent conductivity along the entire length of the conductor. The stability of this interface is essential for grounding systems expected to operate reliably for decades.
Adhesion testing further verifies this bond. During evaluation, samples are clamped and hammered to expose the copper layer. While minor copper loss at the clamp position is acceptable, the remaining surface must show no peeling or detachment from the steel core, confirming the robustness of the copper-to-steel connection.
Electrical Corrosion Resistance Under Fault Conditions
Metro grounding networks must endure repeated electrical stress as well as electrochemical reactions. Sunlightweld copper bonded tape undergoes simulated fault-current electrocorrosion testing with strict acceptance criteria. The final resistance increase must remain within 50% of the initial value, resistance growth per test stage must not exceed 15%, and the conductor surface must remain free from cracks, pits, bubbles, or other defects.
These results demonstrate the ability of copper bonded tape to maintain electrical continuity even after prolonged exposure to demanding operating conditions.
Supporting Large-Area Grounding Design
Extensive field experience in power plants, substations, and petrochemical facilities revealed a practical limitation in conventional copper bonded grounding rods—their relatively short length. Rods typically measure less than six meters, meaning that horizontal grounding grids require frequent welded joints, increasing labor demands, extending construction timelines, and raising overall project costs.
To address this challenge, Sunlightweld developed 100-meter copper bonded round wire and copper bonded tape supplied in coil form. This longer format significantly reduces the number of required connections, streamlines installation, and improves efficiency across expansive metro grounding networks. By simplifying deployment while preserving electrical performance, Sunlightweld copper bonded tape offers a practical solution for modern large-area grounding systems.
Sunlightweld: Manufacturer of Grounding Solutions
Sunlightweld is a professional manufacturer and supplier of advanced earthing materials, grounding products, complete earthing systems, and lightning protection solutions, dedicated to delivering high-performance reliability. By leveraging China’s mature industrial ecosystem, the company balances cost efficiency with manufacturing precision, offering stable raw material sourcing, scalable production capacity, and competitive factory-direct pricing—helping partners achieve at least 30% higher profit potential compared to many alternative brands. As global rail and infrastructure investments continue to grow, Sunlightweld is actively expanding partnerships with distributors, contractors, and engineering firms seeking dependable grounding materials supported by strong factory expertise, creating strategic value through improved project safety and stronger commercial returns.
Conclusion
Reliable grounding is essential for safe metro operations, requiring materials that can endure harsh underground conditions and long-term electrical stress. Sunlightweld copper bonded tape integrates a steel core with a corrosion-resistant copper layer, delivering both mechanical strength and excellent conductivity through a permanent molecular bond for lasting stability. By reducing connection costs by up to 90% and enabling faster installation across large grounding networks, it meets both technical and economic demands. Trusted in metro systems including Chongqing, Shenzhen, and Wuhan, Sunlightweld copper bonded tape provides dependable performance while supporting partners with stronger profitability and factory-backed reliability.
https://www.sltup.com/Copper-Bonded-Steel-Tape-Coil-For-Earth-Rod-Factory-Price-China-Manufacturer.html
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