Q1. What is the typical rate for metal fabrication services in India?
Metal fabrication rates in India vary by service type and complexity: sheet metal fabrication (laser cut, bend, weld): Rs.85–350/kg finished weight; structural steel fabrication (IS 2062, standard connections): Rs.55–140/kg; pressure vessel fabrication: Rs.120–450/kg (or Rs.1.2 lakh to Rs.85 lakh per vessel depending on design pressure, size, and material); pipe spooling: Rs.120–450/kg; precision TIG welding: Rs.400–1,800/hr. Rates are higher for SS and alloy steel than for MS, and for certified (ASME, IBR) work vs. non-code fabrication. Always compare rates per kg of finished fabrication – not per kg of raw material.
What welding certifications should I look for in a fabrication contractor?
Key welding certifications for Indian fabrication contractors: WPS and PQR (mandatory for any code-compliant work – IS 816, ASME IX, AWS D1.1); ISO 3834-2 (comprehensive welding quality management – the gold standard for process plant and critical structural work); IBR Form C or D registration (mandatory for pressure vessels, steam piping, and boiler fabrication under Indian Boiler Regulations); ASME U-stamp (for ASME Section VIII pressure vessels – required for some export customers and multinational plant operators); AWS D1.1 (for structural steel welding – preferred by some EPC and infrastructure clients). Welder qualification tests (WQT) per applicable code are as important as procedure qualification – confirm both.
What is IBR and when does it apply to fabrication in India?
IBR (Indian Boiler Regulations, 1950) is the statutory framework governing design, fabrication, inspection, and certification of boilers, pressure vessels, steam piping, and related equipment operating above specified pressure and temperature thresholds. IBR applies to: steam boilers above 22.75 litres capacity; steam piping above 1 kg/cm2 pressure and 254mm diameter; economisers, superheaters, feed water heaters in boiler circuits; pressure vessels in certain configurations. IBR-notified equipment must be fabricated by IBR-registered manufacturers holding Form C (manufacturers) or Form D (repairers). First and third-party inspection at defined stages is mandatory, and the final 'IBR stamping' (Form XIII) is required before commissioning. Buying IBR-applicable equipment from non-registered fabricators is illegal and voids insurance.
What NDT methods are most important for welded fabrications?
NDT (Non-Destructive Testing) methods for welded fabrications: Visual Testing (VT) – mandatory minimum for all welds; detects surface defects, dimensional non-conformance, and workmanship issues. Dye Penetrant Testing (DPT/PT) – detects surface-breaking defects in non-magnetic materials (SS, aluminium, non-ferrous). Magnetic Particle Testing (MPT/MT) – detects surface and near-surface defects in ferromagnetic materials (carbon steel, alloy steel). Ultrasonic Testing (UT) – detects subsurface volumetric defects (porosity, lack of fusion, cracks) in welds and base materials; most versatile method for structural and pressure welds. Radiographic Testing (RT/X-ray) – full cross-section volumetric inspection; mandatory for pressure vessel shell welds per ASME and IBR. Phased Array UT (PAUT) – advanced UT providing full weld volume coverage with stored data; increasingly specified for critical welds replacing RT.
What is ISO 3834 and why does it matter for fabrication quality?
ISO 3834 is the international standard for Quality Requirements for Fusion Welding of Metallic Materials, consisting of three levels: ISO 3834-4 (elementary), ISO 3834-3 (standard), and ISO 3834-2 (comprehensive). ISO 3834-2 (comprehensive) is the most rigorous and specifies requirements for: review of requirements and technical review; subcontractor controls; welding personnel qualification; equipment inspection and testing; WPS and PQR documentation; material traceability; welding consumable storage and control; pre-heat and PWHT (post-weld heat treatment) controls; inspection and testing; nonconformance control; and calibration. For process plant, critical structural, and export fabrication, specifying ISO 3834-2 compliance from your fabricator is the most effective single quality requirement you can impose.
