The Effect of Shape of Pin on the Mechanical Properties of Welded ABS Sheets with a New Designed Tool in Friction Stir Welding Process

Tool design is one of the most important parameters in welding process [1]. In Friction Stir Welding (FSW) process, with common tools usually a slit is formed behind the weldedspecimens [1,2]. In this paper, a new tool with two shoulders, in up and down of part, is used in order to weld ABS sheets.This new design of tool is successfully eliminated slit behind the welded parts. The effect of shape of pin (simple and convex) with varying amount of rotational speed andtranslational speed on mechanical properties of welded sheets is investigated. Experimental results are showed that joining issuccessfully accomplished using the new tool. Results also showed that at all processing conditions convex pin gives better mechanical properties compared to the simple one