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Engineered to meet international railway standards (TB/T, EN 14730, AREMA), ensuring high strength, zero joint impact, and superior metallurgical stability under tropical climates.
Empowering the continuous welded rail (CWR) transformation across broad-gauge passenger corridors, coastal routes, and international port terminals.
The national railway system operated by Sri Lanka Railways (SLR) spans over 1,500 route kilometers on a 5 ft 6 in (1,676 mm) broad-gauge layout. Traditionally reliant on mechanical fishplate joints, SLR has embarked on extensive modern track renewal programs. Fishplated rail joints are notoriously prone to joint batter, bolt shearing, fishplate cracking, and track foundation degradation. By implementing modern aluminothermic welding (thermit welding) solutions, Sri Lankan railway lines are systematically converting to Continuous Welded Rail (CWR).
CWR tracks eliminate joint impacts, resulting in substantially smoother passenger journeys, higher operational speeds, reduced axle-box fatigue on rolling stock, and dramatically lower annual permanent-way (P-Way) maintenance expenditures across the Western, Central, and Northern provinces.
Sri Lanka's tropical marine environment presents unique geotechnical and metallurgical challenges. High relative humidity (often exceeding 85%), high ambient temperatures, seasonal southwest and northeast monsoons, and corrosive coastal salt mists along the Colombo-Galle-Matara-Beliatta corridor cause accelerated oxidation of standard rail steel.
Our specialized aluminothermic welding formulas feature precision-balanced deoxidizers, vanadium/titanium micro-alloying elements, and hydrophobic luting compounds. This ensures that field welds executed under demanding Sri Lankan conditions achieve high metallurgical cleanliness, complete slag separation, zero hydrogen embrittlement, and exceptional hardness profiles matching UIC 54, UIC 60, BS 80A, and BS 90R rail grades.
From steep mountainous gradients to ultra-heavy seaport crane terminals, RMTS thermit welding delivers uncompromised joint integrity.
The Port of Colombo (including CICT, SAGT, and JCT) and Hambantota International Port are vital maritime transshipment hubs in South Asia. High-capacity Ship-to-Shore (STS) gantry cranes and Rail-Mounted Gantry (RMG) cranes exert extreme wheel loads (over 60–80 tonnes per wheel) on DIN 536 crane rails (A75, A100, A120, QU100). Aluminothermic welding provides continuous, high-shear crane rail joints, preventing crane vibration, rail end flaking, and structural crane fatigue.
The Main Line winding through Sri Lanka's central highlands (Peradeniya, Nawalapitiya, Hatton, Nanu Oya, to Badulla) features steep gradients up to 1:44 and sharp 5-chain (100-meter radius) curves. Heavy lateral wheel flange forces cause severe side wear. RMTS wear-resistant thermit portions produce weld metal with matching work-hardening properties, eliminating localized joint dipping and ensuring long-term track safety on mountain passes.
The Coastal Line running along the southwestern shoreline is subjected to continuous ocean spray and intense tropical sun. Furthermore, modernization projects such as the Colombo Suburban Railway Project (Kelani Valley Line, Main Line suburban tracks) demand high track regularity and seamless welds for modern DMU train sets and suburban commuter trains, mitigating noise pollution and vibration in densely populated urban centers.
RMTS is a manufacturer specializing in railroad thermit welding materials, based in Tianjin, China. With a factory spanning 5,500+㎡ and 30+ dedicated professionals, we are committed to delivering reliable and efficient thermit welding solutions to clients across the globe, including railway operators and infrastructure contractors in Sri Lanka.
Our products are designed to meet the highest industry standards, ensuring durability and performance in various applications. We understand that successful welding projects require not only high quality products but also expertise and knowledge. That’s why we offer comprehensive on-site training programs to help our clients master the thermit welding process, enabling them to achieve optimal results and build a strong reputation in their respective fields.
Additionally, our experienced team provides project welding instruction services, offering hands-on guidance and support to ensure seamless execution, no matter where the project is located. Driven by a customer-centric approach, RMTS is dedicated to fostering long-term partnerships by delivering exceptional products and services tailored to the unique needs of our clients. Whether you are looking for reliable thermit welding materials, expert training, or project support, RMTS is your trusted partner in achieving welding excellence.
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Our commitment to technological innovation guarantees field-tested, certified thermit welding products for international railway markets.
RMTS have a highly skilled R&D team that works tirelessly to ensure that we produce thermit welding materials that meet the specific needs of each type of rail (including BS 75R, BS 80A, BS 90R, UIC 54, UIC 60, and crane rail profiles).
In addition to its strong R&D capabilities, RMTS actively participates in railway projects across China and abroad. The company collaborates with railway authorities, construction companies, and maintenance organizations to provide its expertise and materials for various projects.
By participating in railway projects, RMTS contributes to the development and maintenance of China's extensive railway network. Whether in high-speed rail, urban transit systems, or conventional rail lines, RMTS offers its thermit welding materials and services to ensure the integrity and safety of the rail infrastructure.
Furthermore, RMTS maintains partnerships with research institutions, universities, and industry experts in China. These collaborations enable RMTS strengthens its R&D capabilities in thermit welding technologies.
RMTS's strong R&D abilities, coupled with its involvement in railway projects, demonstrate the company's commitment to providing advanced thermit welding solutions that meet the specific demands of the railway industry. We provide continuous technical oversight, certified welding consumables, and tailored track solutions suited to tropical climates.
Providing versatile refractory options and broad market adaptability across diverse heavy rail sectors.
Single-use eco-friendly refractory crucible. Pre-installed automatic thimble eliminates manual tapping, minimizes human error, and provides optimal thermal insulation during the exothermic reaction.
Multi-use magnesia/graphite crucible capable of performing dozens of successive welds. Highly economical for high-density railway maintenance and localized workshop pre-fabrication.
Our main markets are in areas such as railway main lines, seaport crane rails, subways, trams, and high-speed railways. Aluminothermic welding plays a crucial role in these fields. No matter the scenario, RMTS welding technology, with its excellent performance, serves as a powerful support for promoting industry development and ensuring operational safety.
Thermit portion, sand mould, luting sand, and ignitor are the main consumables for aluminothermic welding. 1 weld = 1 set consumables.
Aluminum thermite welding, also known as aluminothermic welding or thermit welding, is a specialized welding technique that utilizes an exothermic chemical reaction (Fe2O3 + 2Al → Al2O3 + 2Fe + Heat) to generate intense heat (exceeding 2,500°C) for joining steel rails seamlessly on track site without heavy external electric power sources.
Preparation (Step 1): Ensure the rail ends to be welded are clean, free from rust, grease, oil, and moisture, and properly aligned. The gap size (space between two rails to be welded) shall be 26±2mm.
Assembly & Preheating: Clamp the preformed sand mould symmetrically over the rail joint gap. Seal all joints thoroughly using RMTS luting sand. Preheat rail ends with a dedicated propane/oxygen or gasoline preheating burner to approximately 900°C–1000°C. Ignite the thermit powder using an ignitor. Upon reaction completion (approx. 20–25 seconds), molten steel automatically taps into the mould cavity, fusing the parent rail ends. Allow cooling, shear excess weld metal, and finish with precision rail profile grinding.
Welding Instructions: Thermit welding materials will fail with water. All welding materials must be kept strictly away from any moisture in storage, as well as during the welding process. High humidity or damp portion powder will cause severe porosity, blowholes, and catastrophic brittle fracture.
Storage Instruction: Thermit welding requires careful handling and storage of its materials to ensure safety and optimal performance. Portions and sand moulds must be stored on raised pallets in well-ventilated, moisture-controlled warehouses, sealed against monsoon humidity.
When planning track renewal or new line construction in Sri Lanka, project engineers can calculate the required thermit welding consumable sets using the following standard formula:
*Note: For 25m rails or 100m factory-welded strings, replace 12.5m accordingly. It is recommended to add a 3%–5% allowance for field test welds and quality assurance samples.
RMTS offers a wide range of thermit welding materials, such as welding kits, sand moulds, one shot crucibles, long life crucibles, luting sand, and high-temperature ignitors, ensuring consistent quality and reliable performance.
We also supply full track maintenance toolkits—including hydraulic straighteners, rail pullers, double-headed bolt wrenches, rail shearing units, profile grinding machines, and internal combustion rail drills—to provide Sri Lankan railway contractors with an end-to-end engineering solution.
High-precision hydraulic tools, cutting, drilling, and grinding machinery designed for tough field conditions.
Original certified thermite welding materials and mechanical equipment for Sri Lanka railway projects.
We provide specialized on-site welding instructor dispatch, comprehensive technical training for Sri Lankan railway work gangs, certified metallurgical lab testing, and customized supply chain logistics for major track construction and maintenance projects.
