How strict ultrasonic NDT testing, submerged arc welding (SAW), and laser fit-up safeguard complex bridge girders, sub-stations, and heavy industrial facilities.
Structural Fabrication in Demanding Industrial Environments
Heavy industrial infrastructure—ranging from captive power plant boiler supports to heavy crane gantries and metro rail superstructures—operates under intense cyclic static and dynamic loading. Designing and fabricating these structures requires strict adherence to international fabrication codes such as IS 800, AWS D1.1, and EN 1090.
At RMPL's advanced fabrication yards in Korba and Jharsuguda, every structural assembly follows an unyielding quality pipeline from mill test certification to final blast cleaning and polyurethane coating.
3 Pillars of Structural Fabrication Excellence
1. Material Traceability & CNC Plate Cutting
Every steel plate entering our fabrication facility undergoes positive material identification (PMI) and ultrasonic scanning for laminar tears. Using high-precision CNC high-definition plasma and oxy-fuel multi-torch cutting systems, plate beveling and root faces are prepared with mathematical precision.
- Dimensional Tolerance: Edge squareness maintained within $\pm 0.5\text{ mm}$.
- Bevel Angle Accuracy: Maintained strictly within $\pm 1^\circ$ to guarantee optimal weld penetration.
2. High-Deposition Welding Technologies
Structural longevity is forged at the weld root. RMPL utilizes automated and semi-automated welding setups:
- Submerged Arc Welding (SAW): For longitudinal box girders and built-up H-beams, offering deep weld penetration, high deposition rates, and uniform metallurgical characteristics.
- Flux-Cored Arc Welding (FCAW) & SMAW: Certified multi-position welding by welders qualified under ASME Section IX and AWS D1.1 standards.
- Preheat & Interpass Temperature Regulation: Monitored with calibrated infrared thermography and contact pyrometers to eliminate hydrogen-induced cold cracking in high-tensile structural steels (E350/E450).
3. Non-Destructive Testing (NDT) Protocol
Zero-defect structural assurance is verified via a comprehensive NDT inspection regime:
| NDT Method | Target Application | Acceptance Standard |
|---|---|---|
| Visual Testing (VT) | 100% of fabricated joints, undercut & porosity check | AWS D1.1 Table 6.1 |
| Magnetic Particle (MPT) | Fillet welds and high-stress gusset connections | ASME Sec. V Art. 7 |
| Ultrasonic Testing (UT) | Full penetration butt welds on main flanges | ASME Sec. V Art. 4 |
| Radiographic Testing (RT) | Critical tension member intersections & bridge nodes | AWS D1.1 Clause 6 |
Surface Protection & Turnkey Site Delivery
Even the most robustly welded girder is vulnerable to atmospheric oxidation and aggressive industrial environments if surface preparation is compromised. RMPL guarantees:
- Centrifugal Shot Blasting achieving Sa 2.5 cleanliness profile.
- Inorganic Zinc Silicate Primer applied within 4 hours of blasting.
- High-Build Epoxy & Polyurethane Topcoats delivering up to 15+ years of corrosion resistance in chemical and marine microclimates.
With over 35,000 MT of structural fabrication delivered across thermal power stations, aluminium smelters, and public infrastructure projects, RMPL stands as a trusted engineering partner to India's core sectors.
