MUMBAI, India, Aug. 31 -- Intellectual Property India has published a patent application (202641101611 A) filed by Chennai Institute Of Technology on August 22, 2026, for Thread Pin Type Friction Stir Welding Tool Developed Via Additive Manufacturing.
Inventors include Dr. V. Dhinakaran; Dr. S. Mohan Kumar; Ms. M. Ashmita, Student; Mr. R. Subavelan, Student; and Ms. J. Kanishkaa, Student.
The application for the patent was published on August 28, 2026, under issue no. 35/2026.
Abstract: This invention discloses a conical pin type friction stir welding tool manufactured through hybrid manufacturing, achieved by machining shank and shoulder from a wrought alloy billet and depositing conical pin from H13 tool steel filler wire using wire arc additive manufacturing, thereby producing a single integrated tool that draws on strengths of both fabrication methods. Shank is a cylindrical section of Ø20 mm diameter and 40 mm height that provides secure machine clamping; shoulder is Ø22 mm diameter and 25 mm height, supplying load bearing area and generating frictional heat at workpiece interface; conical pin tapers progressively from a Ø6 mm base to a Ø4 mm tip across approximately 5.7 mm at a 10° taper angle, constituting principal heat generating and material stirring element during welding cycle. Wrought Alloy substrate ensures precise geometry and isotropic mechanical properties for shank and shoulder, while wire arc additive manufacturing of pin via gas metal arc welding reduces material loss and avoids complex multi-axis machining of taper profile. Post deposition heat treatment applied to deposited H13 pin promotes grain refinement of microstructure, raising hardness and imparting superior wear resistance over extended service periods. Feasibility and viability of hybrid manufactured tool were established through visual inspection, dimensional verification, and confirmed by successful friction stir welding of aluminum alloys used in aerospace application, validating tool for next generation, high performance industrial friction stir welding at substantially reduced fabrication cost.
Disclaimer: Curated by HT Syndication.
