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Every component in our thermit welding kits is precision-engineered to guarantee flawless rail joint connections across all track environments.
Thermit welding kits — also known as aluminothermic welding kits — are self-contained systems that use a highly exothermic chemical reaction between aluminum powder and iron oxide to produce molten steel at temperatures exceeding 2,500°C. This molten steel is cast directly into a mould surrounding the rail gap, forming a metallurgically bonded joint that is as strong as — or stronger than — the parent rail.
Unlike mechanical fasteners or flash-butt welding which requires fixed plant equipment, thermit welding kits are fully portable, require no external power source, and can be deployed rapidly in remote or confined environments. This makes them the preferred solution for field track connecting operations across mainline railways, metro systems, crane rails, and industrial trackwork worldwide.
A complete thermit welding kit for track connecting typically includes: thermite welding powder (the reaction charge), a one-shot or reusable crucible, precision sand moulds, mould clamps, luting sand for sealing, and a crucible cap — every component working in concert to deliver a repeatable, high-integrity weld joint.
The thermit welding kit market is experiencing robust growth driven by global railway expansion, urban transit investment, and industrial infrastructure modernization.
According to the International Union of Railways (UIC), global rail network length surpassed 1.4 million km in 2024, with Asia-Pacific, the Middle East, and Africa driving the most aggressive expansion. Every new kilometer of track requires multiple thermit weld joints, sustaining massive demand for high-quality welding kits.
Over 200 cities worldwide are currently constructing or expanding metro and light rail systems. These projects demand compact, portable, and fast-deploying welding solutions — precisely the advantage of thermit welding kits. Market analysts forecast the urban rail sector to drive 35%+ of global thermit welding kit consumption through 2030.
Seaports, steel mills, mining operations, and logistics hubs are upgrading their internal crane rail and industrial trackwork to handle heavier loads and higher throughput. Thermit welding kits offer the only field-viable solution for connecting heavy-section rails (such as A150, A120, and P65 profiles) without fixed plant infrastructure.
National and international standards (EN 14730, BS EN, AREMA, etc.) are becoming increasingly stringent. Modern thermit welding kit manufacturers are investing in R&D to produce kits with tighter dimensional tolerances, improved metallurgical consistency, and digital quality traceability — aligning with smart rail infrastructure requirements.
Railway operators and EPC contractors are increasingly seeking local or regional thermit welding kit suppliers to reduce lead times and supply chain risk. This trend is accelerating OEM and custom-formula kit production, where manufacturers like RMTS provide tailored solutions for specific rail steel grades and climate conditions.
The industry is actively developing lower-emission thermite formulations, recyclable mould materials, and waste-reduction packaging. Sustainability certifications are becoming a procurement prerequisite for major railway authorities in Europe and North America, pushing manufacturers to innovate across the entire kit lifecycle.
From high-speed mainlines to underground metro tunnels and heavy industrial crane rails, thermit welding kits deliver unmatched versatility and performance.
On mainline and high-speed corridors, continuous welded rail (CWR) is the standard, demanding hundreds or thousands of thermit weld joints per project. Kits must produce joints with near-zero surface irregularity (≤0.3mm) to prevent wheel-impact fatigue at speeds exceeding 250 km/h. RMTS kits are formulated for UIC 60, 75kg, and 136RE rail profiles, meeting EN 14730-1 and TB/T standards.
Metro environments present unique challenges: confined tunnel spaces, strict noise and vibration limits, and 24/7 operational schedules with minimal maintenance windows. Thermit welding kits are ideal here because they require no electrical power infrastructure, generate minimal equipment footprint, and can complete a weld cycle in under 45 minutes — critical for overnight track possession windows in busy urban systems.
Overhead travelling cranes, gantry cranes, and transfer cars in steel mills, shipyards, and warehouses operate on heavy crane rails subject to extreme point loads and cyclic fatigue. Thermit welding kits designed for crane rails (A-series, DIN 536) must produce joints with superior hardness matching and minimal residual stress — preventing premature joint failure under repetitive heavy loading cycles.
Container terminals and bulk cargo ports rely on rail-mounted quay cranes (QC) and rubber-tyred gantry (RTG) systems running on crane rails exposed to salt air, moisture, and extreme wheel loads. Thermit welding kits for seaport applications require corrosion-resistant metallurgical formulations and moulds engineered for large-section rails, ensuring joint longevity in harsh marine environments.
RMTS maintains a highly skilled R&D team that works tirelessly to develop thermit welding materials precisely matched to each rail steel grade — from standard carbon rails to heat-treated and head-hardened profiles used in heavy-haul and high-speed applications.
RMTS actively participates in railway projects across China and internationally, collaborating with railway authorities, EPC construction companies, and maintenance organizations to provide expert materials and on-site technical support for diverse and demanding project environments.
By supplying thermit welding kits to high-speed rail, urban transit, and conventional rail projects, RMTS contributes directly to the development and long-term safety of China's extensive — and the world's most advanced — railway infrastructure network.
RMTS maintains active partnerships with leading research institutions, universities, and railway industry experts in China, enabling continuous advancement of thermit welding technologies, formula optimization, and new product development aligned with evolving international standards.
RMTS's strong R&D capabilities, coupled with its deep involvement in railway projects across Asia and beyond, demonstrate the company's unwavering commitment to providing advanced thermit welding solutions that meet the specific demands of the railway industry.
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.
Our experienced team also 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 thermit welding kits and services tailored to the unique needs of each client.
RMTS operates a 5,500+㎡ modern manufacturing facility in Tianjin, China, equipped with advanced production and quality control systems for thermit welding kit manufacturing.
As part of the Phase 2 expansion of Jakarta's Mass Rapid Transit (MRT) system, RMTS was contracted to provide aluminothermic welding solutions for the new underground and elevated tracks. The project involved welding 600 rail joints across a 12-kilometer stretch, connecting key areas of the city to reduce traffic congestion.
Our team worked closely with PT MRT Jakarta to ensure the welds met international safety standards. The project was completed on time, and the new line has been operating smoothly since its launch. Jakarta MRT officials highlighted the durability of the welds, which have withstood the high frequency of train movements and tropical weather conditions.
Challenge: The client faced the challenge of welding materials for T62 and P65 rails. The welding process needed to meet the rigorous standards set by the railway authorities, ensuring optimal track performance, longevity, and safety under extreme cold-climate operating conditions.
Solution: Our team collaborated closely with the client, thoroughly understanding their specific requirements. We provided high-quality thermit welding kits tailored to the T62 and P65 steel rail specifications, including custom-formulated welding powder and precision moulds engineered for these rail profiles.
Customer Satisfaction: The client expressed utmost satisfaction with our thermit welding materials, acknowledging superior quality, reliability, and the technical support provided by our team. Our materials played a crucial role in enabling them to deliver high-quality rail construction and meet the demanding standards of the Russian railway industry.
KTMB Railways aimed to improve connectivity across the city's suburbs. RMTS was selected as the most trusted supplier, providing 1,000 aluminothermic welding kit sets for the new tracks, which included both underground and elevated sections. The project required precise welding to ensure smooth and safe operations serving millions of passengers annually.
RMTS's thermit welding kits were chosen for their ability to create strong, seamless rail joints capable of withstanding Malaysia's humid tropical climate and the heavy usage demands of a major commuter rail network. The project was completed ahead of schedule, and the new line has significantly reduced travel times for commuters across the region.
Ensures seamless rail joints and durable connections critical for maintaining the safety and performance of mainline railway networks at high speeds and under heavy axle loads.
Widely used in the welding of crane rails due to its efficiency, reliability, and ability to create strong, durable joints capable of withstanding repetitive heavy point loading in industrial environments.
Ideal for the confined spaces and tight overnight maintenance schedules of metro rail construction and maintenance — no external power required, fast cycle time, minimal equipment footprint.
RMTS's aluminothermic welding technology ensures smooth, reliable rail joints for cargo handling equipment in marine environments, with formulations engineered for corrosion resistance and heavy-duty performance.
Explore our comprehensive range of thermit welding kit components — every item engineered for precision, durability, and performance in track connecting applications.
