A feasibility research on friction stir welding of a new-typed lap-butt joint of dissimilar Al alloys

被引：23

作者：

Li, Bo ^{[1
]}

Shen, Yifu ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China

来源：

MATERIALS & DESIGN | 2012年 / 34卷

基金：

中国国家自然科学基金;

关键词：

Non-ferrous metals and alloys; Welding; Mechanical; MATERIAL FLOW; MECHANICAL-PROPERTIES; PROCESS PARAMETERS; ONION RINGS; MICROSTRUCTURE; MODEL; TOOL;

D O I：

10.1016/j.matdes.2011.05.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new-typed joint configuration, called lap-butt joint of dissimilar aluminum alloys, consisted of a single AA6063 plate of 4 mm thick and two overlap AA5052 plates of 2 mm thick. As needed as some engineering applications, the lap-butt joint was successfully welded through the friction stir welding technique using a designed tool of W9Mo3Cr4 V with some geometric improvements. The optimum work conditions and a process map were obtained after the welding process parameter optimization experiments. The process window was built aiming to choose the suitable processing conditions to pursue the high-quality lap-butt joints. The effects of welding parameters, especially the value of pin off-set, on weld-formation, microstructures and mechanical tensile properties of the lap-butt joints of dissimilar aluminums were investigated. The parameter of pin off-set played a very important role and exerted stronger influence upon the joint quality. Three typical micro flow-patterns of plasticized materials were found in the weld-zones: circumfluence, laminar-flow and turbulent-flow. Some weld-defects and the morphologies of 'onion rings' were detected. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：725 / 731

页数：7

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