• Categories:NEWS
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• Time of issue:2022-01-17 17:21
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(Summary description)Impact of Tool Profile on MechanicalProperties of AZ31B Mg Alloy during FSW Using Optimized Parameters In this experimental investigation, an attempt was made to understand the influence of the tool profile on the mechanical properties of the joints fabricated during friction stir welding (FSW) of AZ31B Mg alloy flat plates. When the specimens prepared from the successfully fabricated joints were subjected to tensile tests as per prescribed International Standards it was observed that employing a taper cylindrical pin profiled tool resulted in sound quality lap joints with improved mechanical properties. Moreover, the use of other tool profiles namely straight cylindrical&straightsquare could not produce defect free joints. Further, this investigation reveals us that the common FSW defects including low distortion, lack of cavity, tunnel defects etc are found to be completely eliminated while using taper cylindrical pin profiled tool. Keywords: AZ31B Mg alloy, Friction stir welding, tool profile, mechanical properties. Magnesium (Mg) alloys, being one of the lightest structural materials, are nowadays widely replacing copper, aluminium and steel alloys in various and structural applications and automotive industries [1]. This is mainly due to their excellent properties including high strength in combination with a low density, greater thermal conductivity, sound castability and high machinability [2]. Welding defects & solidification problems including hot cracking, porosity, partial melting zones, segregation of alloys etc are found to be present with the adoption of fusion welding techniques for Mg alloys [3].Hence, additional care should be taken while selecting the suitable welding process for fabricating parts composed of magnesium alloys. Friction Stir Welding (FSW), an innovative type of solid state welding technique invented & developed by The Welding Institute (TWI), seems to provide higher potential for joining magnesium alloys [4]. The main advantage of FSW process is that the welding takes place without melting the base metal, thereby eliminating the welding defects like porosity, cracks etc in the welded joints. Hence, this FSW is found to be more suitable for welding magnesium alloys when compared with the conventional resistance spot welding techniques