Analysis of Underwater Friction Stir Welding of Process Connection on Alumunium Series 6005-T6 on Impact Strength and Micro Structure

Underwater Friction Stir Welding (UFSW) is a solid state welding process that is able to unite materials with water that are relatively difficult to weld using fusion welding. Special attention is paid to basic principles including material flow, generation temperature, process parameters, microstructure and mechanical properties. The research results showed that the highest impact value in specimen 2 was 0.944 Joules/mm2 compared to the base metal with an impact value of 0.641 Joules/mm². Micro tests on fine grains in the weld nugget (WN) area clearly show differences with a denser structure compared to the thermo-mechanically affected zone (TMAZ) which is the tool edge area or what is usually called plastic deformation in the UFSW process, which can cause zones the weld becomes stronger than in the base metal (BM) area.