Fabrication of the Copper/ Aluminum Alloy Clad Plate Using Friction Stir Welding

• Main Authors: Jui-En Chang, 張瑞恩
• Other Authors: Rong-Tsong Lee
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/25r7aa

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 102 === This study tried to join copper sheet (3 mm thick) on aluminum alloy plate (7 mm thick) by friction stir lap welding using a pinless tool with 16 mm diameter at zero tilt angle. First, in order to prevent the oxidation of the joining surface in the welding process, an aluminum sheet (10 mm thick) was machined to form a rectangular slot of 25 mm wide on its center region to accommodate a copper sheet (3 mm thick). Four edges of copper sheet were welded by the friction stir butt welding using a pinless tool as a pretreatment. Second, effects of rotational speed and plunge depth on the quality of the welded joint by the friction stir spot welding were investigated. Experimental results showed that the fractured thickness of aluminum alloy adhered on the copper sheet increased with increasing rotational speed of a plunge depth of 0.2 mm, and with increasing plunge depth at a rotational speed of 1000 rpm. According to the above results to select the rotational speed and plunge depth, effect of welding speed on the shear strength and the measured temperature in the joint line at a distance of 10 mm from top surface of workpiece was investigated in the friction stir lap welding. Experimental results showed that the shear strength of welded specimen was stronger at low welding speed, but the quality of the welded joint was unstable at the welding speed of 32 mm/min. The multiple passes of copper sheet can be successfully joined on the aluminum alloy plate using the rotational speed of 1000 rpm, plunge depth of 0.3 mm, and welding speed of 60 mm/min.