On the double-side probeless friction stir spot welding of AA2198 Al-Li alloy

被引：0

作者：

QChu ^{[1
]}

WYLi ^{[1
]}

HLHou ^{[2
]}

XWYang ^{[1
]}

AVairis ^{[1
,3
]}

CWang ^{[2
]}

WBWang ^{[2
]}

机构：

[1] State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University

[2] Beijing Aeronautical Manufacturing Technology Research Institute

[3] Mechanical Engineering Department, TEI of Crete

来源：

Journal of Materials Science & Technology | 2019年 / 35卷 / 05期

关键词：

Friction stir welding; Double-side; Al-Li alloy; Microstructure; Mechanical property;

D O I：

暂无

中图分类号：

TG453.9 [];

学科分类号：

080201 ; 080503 ;

摘要：

Double-side probeless friction stir spot welding(DP-FSSW) of AA2198 alloy was conducted to investigate the microstructure and mechanical properties. Compared with common single-side probeless friction stir spot welding(P-FSSW), the plastic strain during DP-FSSW is nearly symmetrical with respect to the bondline to suppress the extension of hook defect, which is detrimental to the joint mechanical strength.With DP-FSSW, a fully metallurgically bonded region has formed due to severe plastic deformation at high temperatures. Tensile/shear tests show that the joint strength could exceed 8 kN, which is comparable to P-FSSW and refill FSSW, and all fractures happen in a shear failure mode as cracks extend along the interface of two sheets. The microhardness profile exhibits a uniform distribution along the thickness direction, in which the hook defect shows the lowest value.

引用

页码：784 / 789

页数：6