การเปรียบเทียบสมบัติเชิงกลและโครงสร้างมหภาคของแนวเชื่อมอะลูมิเนียมผสมหล่อกึ่งแข็ง SSM 356 กับ SSM 6061 โดยกรรมวิธีการเชื่อมทิกและการเชื่อมเสียดทานแบบกวน

Abstract

The objective of this research was to investigate the mechanical properties and macrostructural analysis of dissimilar aluminum alloys, SSM 356 and SSM 6061 (as-cast and T6) by using different processes: TIG (with filler), TIG (without filler) and Friction stir welding. Aluminum alloys of 4 mm. thickness was used as the base material as for preparing a butt joint welded. The preliminary results of aluminum alloys as cast condition showed that TIG (with filler), TIG (without filler) and Friction stir welding were making a good welded joint of dissimilar aluminum alloys. The result of aluminum alloys by heat treatment (T6) condition showed that different welding process could make dissimilar aluminum alloy joints. The ultimate tensile strength of dissimilar joint by FSW were 168.3 MPa superior to TIG (with filler) and TIG (without filler) welding. The hardness in the weld zone was higher than other areas and would be reduced until it reached the heat affected zone area. After that it would increase up to the base metal area. The average hardness of FSW at the weld zone was at the maximum of 74.1 HV.