Influence of tool shoulder geometry on properties of friction stir welds in thin copper sheets

被引:94
作者
Galvao, I. [1 ]
Leal, R. M. [1 ,2 ]
Rodrigues, D. M. [1 ]
Loureiro, A. [1 ]
机构
[1] Univ Coimbra, Dept Mech Engn, CEMUC, P-3030788 Coimbra, Portugal
[2] Polytech Inst Leiria, ESAD CR, P-2500321 Caldas Da Rainha, Portugal
关键词
Friction stir welding; Shoulder geometry; Microstructure; Mechanical properties; Copper; DYNAMIC RECRYSTALLIZATION; THERMAL HISTORY; ALUMINUM; FLOW; PREDICTION; SIMULATION; PARAMETER; TORQUE; MODEL; ZONE;
D O I
10.1016/j.jmatprotec.2012.09.016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The aim of this work is to study the influence of the shoulder geometry on friction stir welding of 1 mm-thick copper-DHP plates. The welds were produced using three different shoulder geometries, flat, conical and scrolled, and varying the rotation and traverse speeds of the tool. The flat shoulder tool proved to be inadequate for performing welds, because many defects were produced for all welding conditions. In turn, the scrolled shoulder tool is more effective than the conical one in the production of defect free welds. However, both geometries required a minimum rotational speed to avoid internal defects. For the same welding parameters, greater grain refinement, higher hardness and improved strength are also achieved in the nugget of the welds, using the scrolled tool. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:129 / 135
页数:7
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