Effect of Joint Configuration on the Mechanical Properties of Friction Stir Welded Aluminium Copper Joints

摘要

Pure copper (Cu) and pure aluminium (Al) are highly physically and chemically incompatible materials which are difficult to join using fusion welding process. Friction stir welding process (FSW) is capable of joining dissimilar materials due to the low metallurgical reactions at low heat input. However, joining of harder and softer materials concerned, the placement of material in advancing side or retreating side decides the joint quality. In this investigation, the effect of joint configuration on the mechanical properties of friction stir welded aluminium and copper joints were studied. The macro and microstructural analysis revealed that Cu-Al joints results defect free weld region. Higher tensile properties of 95 MPa and hardness of 153 HV was achieved for Cu-Al joints. The high heat generation in the advancing side softens the hard Cu material and extrudes the materials to tool rear side to form the defect free weld zone.