Fire Rated Welded Joint High Safety Structural Joining For Fire Critical

Product Specification

Product Description
A Fire-Rated Welded Joint is a high-safety structural joining solution designed to maintain load-bearing capacity under high-temperature fire conditions, integrating fire protection and structural performance. This product adopts AWS D1.1 standard welding process with ER50-6 low-hydrogen welding wire, ensuring base material (Q355B) compatibility and weld strength equal to the parent metal, while the surface is coated with intumescent fireproof paint (dry film thickness ≥1.5mm) that expands to form a dense carbonized layer (expansion ratio ≥10:1) at high temperatures (≥300℃), isolating oxygen and protecting the weld from rapid oxidation. One of the key features of this joint is its excellent fire resistance—fire resistance rating of 1.5-2.5 hours (customizable based on coating thickness), complying with GB 50016 building design fire code, and maintaining over 80% of its original load-bearing capacity at 600℃, which is 3-4 times higher than unprotected welded joints. The built-in fireproof 封堵 material (ceramic fiber) fills gaps between welds and connected members, preventing flame penetration and heat transfer. The welds undergo 100% ultrasonic flaw detection to ensure no internal defects, and the fireproof coating is tested for adhesion (≥1.5MPa) and weather resistance (no cracking or peeling after 1000 hours of artificial aging test). It is suitable for fire-critical structures such as data centers, high-rise building core tubes, hospitals, shopping malls, and industrial facilities with flammable materials. The post-fire repairability—local coating repair instead of overall joint replacement—reduces maintenance costs and downtime. Professional services include fire resistance test reports, on-site coating construction guidance, and periodic fire protection performance inspection, ensuring long-term fire safety of the structure.

Applications
Fire-Rated Welded Joints are critical safety-focused joining solutions widely used in fire-critical buildings and industrial facilities. Certified by GB 50016, BS 476, and ISO 9001, they meet international fire protection standards, making them a trusted choice for high-safety requirements. These joints are suitable for diverse fire-critical scenarios, including core tube beam-column connections in high-rise residential and office buildings, server room steel structure connections in data centers, emergency channel support nodes in hospitals, load-bearing structure joints in shopping malls and supermarkets, and equipment foundation connections in chemical plants and oil refineries (flammable and explosive environments). They are also ideal for historical building renovation (fire protection reinforcement of existing welded joints) and public assembly buildings (stadiums, theaters) where fire safety is paramount. The minimum order quantity is 10 joints for standard fire resistance ratings (1.5 hours), and customized solutions are available for fire resistance duration (2.0/2.5 hours), weld size, and base material compatibility (Q235B/Q355B/Q460) to meet specific project fire protection design requirements. Competitive pricing and bulk purchase discounts (for orders over 100 joints) enhance cost-effectiveness, while the delivery time (10-15 workdays, including welding and fireproof coating) supports fire-critical project schedules. With a monthly supply capacity of 2,000 joints, the manufacturer ensures timely delivery even for large-scale high-rise projects. The combination of low-hydrogen welding (crack resistance) and intumescent fireproof coating (long-term fire protection) ensures durability in indoor and outdoor environments, including urban high-rises and industrial zones with strict fire codes. Customization options also include high-temperature resistant welding wire (for special high-temperature working environments) and environmentally friendly fireproof coatings (low-VOC, non-toxic) for indoor public buildings (hospitals, schools). Whether it's for new fire-critical construction or existing structure fire protection upgrading, the Fire-Rated Welded Joint delivers reliable and compliant fire-safe joining performance.