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Patent Details

Indian Institute of Technology (IIT) Roorkee 
Design of stationary shoulder friction stir welding tool for aluminum alloys 
Dheerendra Kumar Dwivedi and Sunil Kumar Sinhmar 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2018-08-29 
Application Number:
Applied at:
Entered by:
Indian Institute of Technology (IIT) Roorkee 
The present invention provides a new friction stir welding tool/ device for solid state joining of metals. It reduces the heat generation during the friction stir welding due to friction between the shoulder and base metal. The stationary shoulder aspect in new friction stir welding tool design helps producing a sound weld joint even with reduced heat input. During the welding, stationary shoulder slides over the surface of the plates to be welded without rotation, which reduce a) the plunging effect of the shoulder, b) friction heat generation between shoulder and base metal and c) thinning of the weld. The tool traverses without rotation of shoulder without producing any flash on the weld joint. The device comprises three parts: rotating tool, stationary shoulder and holder for stationary shoulder. The rotating tool comprises a pin and a sub-shoulder to prevent the upward movement of plasticized material and enter in stationary shoulder body. The new tool produces a symmetrical joint with more uniform properties across the weld joint (advancing side and retreating side of the joint). It also reduces width of heat affected zone. If any, plasticized material enters through the gap between rotating tool pin and stationary shoulder, a blade with rotating tool (fixed in its body) acts as a chip breaker. Stationary shoulder body having machined slots which acts as a passage for the broken chips. Thus, the plasticized material exits the tool body. The invented tool produces a sound weld joint using a wide parameters range with the help of a simple tool design. The design provides easily replacement of worn out stationary shoulder, if needed. Problem of the accumulation of the ingressed material into the tool body is eliminated using this tool. Therefore, it can be used for the producing long run welds. Symmetrical weld joint produced with narrow heat affected zone is one of the most attractive features of this tool.  

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