Abstract:
Product manufacturing from welding process with different material are used increasingly in many manufacturing industries but it is difficult because of a different materials have possessed different properties. The friction stir welding (FSW) for welding AA6063 aluminum and AISI 430 stainless steel has been set up for studying mechanical properties and microstructure.
This evaluation was FSW with various geometries of stirrer including cylinder, screw cylinder (right-left), cone and screw cone (right-left) that welding with vertical milling machine. The evaluation parameters were rotating speed of 250 - 750 rpm and welding speed of 25 - 175 mm./min. The aluminum was overlapped the stainless steel by 30 mm. and the depth of stirrer end that plunged into stainless steel was 0.2 mm. with 2 inclined degrees of stirrer.
The summarized results are as following; The welding, which is used right-screw cylindrical stirrer , has the maximum value of shear strength at rotated speed 500 rpm., welding speed of 175 mm/min has 13.750 kN of shear strength. After inspected the microstructure found that stainless steel insert into aluminum like a branch at side area of structure. The interface area of this joint found that both materials were bonded almost completely. When inspected chemical components it found FeAl at welding interface and tearing area it found aluminum adhered on stainless steel surface at welding joint after testing the tensile strength. This evidence implied that overlapped joint welding by FSW has the strength consistent with shear strength.