MUMBAI, India, June 26 -- Intellectual Property India has published a patent application (202641067985 A) filed by National Institute Of Technology Karnataka on May 30, 2026, for Multi-Inlet Tangential Gas-Drainage Nozzle System For Generating A Stable Localized Dry Cavity During Underwater Welding And Additive Manufacturing Operations.
Inventors include Atul Singh Rajput; and Hadiya Jatin Kanubhai Hansaben.
The application for the patent was published on June 19, 2026, under issue no. 25/2026.
Abstract: Title: Multi-Inlet Tangential Gas-Drainage Nozzle System for Generating a Stable Localized Dry Cavity During Underwater Welding and Additive Manufacturing Operations The current invention relates to a multi-inlet tangential gas-drainage nozzle system configured to generate a stable localized dry cavity (111) during underwater welding, repair and underwater additive manufacturing operations. The system comprises a nozzle body (105) having tangential compressed-gas inlet ports (108), an internal converging cavity with spiral converging flow passages (109), a hollow central passage (107) for accommodating a welding or deposition tool and an outlet configured to discharge high-velocity vortex-assisted gas flow. Compressed gas (101) supplied through the tangential inlet ports generates rotational airflow which is accelerated through the converging spiral geometry to displace surrounding water and create a localized dry environment around the underwater processing region. Computational flow analysis demonstrated airflow amplification up to approximately 96.3 m/s. Experimental validation confirmed stable dry cavity formation, reduced porosity, reduced hydrogen pickup, improved arc stability and weld quality comparable to atmospheric welding conditions without requiring bulky dry chambers or dry-docking procedures.
Disclaimer: Curated by HT Syndication.
