Improving mechanical properties of pinless friction stir spot welded joints by eliminating hook defect

被引：104

作者：

Li, Wenya ^{[1
]}

Li, Jinfeng ^{[1
]}

Zhang, Zhihan ^{[1
]}

Gao, Dalu ^{[1
]}

Wang, Weibing ^{[2
]}

Dong, Chunlin ^{[2
]}

机构：

[1] Northwestern Polytech Univ, Shaanxi Key Lab Frict Welding Technol, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

[2] China FSW Ctr, Beijing 100024, Peoples R China

来源：

MATERIALS & DESIGN | 2014年 / 62卷

关键词：

Friction stir spot welding; 2024-T3 aluminum alloy; Hook defect; Tensile-shear load; Fracture morphology; DISSIMILAR AL ALLOY/STEEL; FATIGUE BEHAVIOR; WELDING PARAMETERS; PIN LENGTH; ALLOY; TOOL; MICROSTRUCTURES; STRENGTH; FAILURE;

D O I：

10.1016/j.matdes.2014.05.028

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hook defect (HD) seriously decreases the mechanical properties of friction stir spot welded (FSSW) joints. In this study, two methods were therefore used to eliminate the HD in pinless FSSW joints. The one is changing welding parameters such as rotating speed and dwell time. The other one is FSSW plus subsequent friction stir welding (FSSW-FSW), which is an innovative method proposed in this study. Experimental results showed that the HD in pinless FSSWed AA2024 joints was successfully eliminated by using FSSW-FSW, not by changing process parameters. The joints without HD exhibited a tensile-shear load of as much as 12 kN, which was higher than that of 6.9 kN in the joints with HD. Furthermore, it was proved that the tensile-shear load is not greatly improved only by increasing the nugget zone when HD still existed in the FSSW joints. In addition, the fracture morphology analysis demonstrated that the shear fracture of the FSSW-FSW joints took place along the boundary between the upper and lower sheets through the weld nugget, and the faying surface between the two sheets was completely sheared off. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：247 / 254

页数：8

共 33 条

[1]

Allen CD, 2005, SAE TECHNICAL PAPER

[2] Preliminary Investigation of the Microstructure and Mechanical Behaviour of 2024 Aluminium Alloy Friction Spot Welds [J].

Amancio-Filho, Sergio T. ;

Camillo, Ana P. C. ;

Bergmann, Luciano ;

dos Santos, Jorge F. ;

Kury, Sebastiao E. ;

Machado, Nelson G. A. .

MATERIALS TRANSACTIONS, 2011, 52 (05) :985-991

[3] Microstructures and Mechanical Properties of Friction Stir Spot Welded Aluminum Alloy AA2014 [J].

Babu, S. ;

Sankar, V. S. ;

Ram, G. D. Janaki ;

Venkitakrishnan, P. V. ;

Reddy, G. Madhusudhan ;

Rao, K. Prasad .

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2013, 22 (01) :71-84

[4] Effect of tool geometry on hook formation and static strength of friction stir spot welded aluminum 5754-O sheets [J].

Badarinarayan, H. ;

Shi, Y. ;

Li, X. ;

Okamoto, K. .

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 2009, 49 (11) :814-823

[5] Effect of tool geometry on static strength of friction stir spot-welded aluminum alloy [J].

Badarinarayan, H. ;

Yang, Q. ;

Zhua, S. .

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE, 2009, 49 (02) :142-148

[6] Effect of reduced or zero pin length and anvil insulation on friction stir spot welding thin gauge 6111 automotive sheet [J].

Bakavos, D. ;

Prangnell, P. B. .

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, 2009, 14 (05) :443-456

[7] Material Interactions in a Novel Pinless Tool Approach to Friction Stir Spot Welding Thin Aluminum Sheet [J].

Bakavos, Dimitrios ;

Chen, Yingchun ;

Babout, Laurent ;

Prangnell, Phil .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2011, 42A (05) :1266-1282

[8] The optimization of welding parameters for friction stir spot welding of high density polyethylene sheets [J].

Bilici, Mustafa Kernal ;

Yukler, Ahmet Irfan ;

Kurtulmus, Memduh .

MATERIALS & DESIGN, 2011, 32 (07) :4074-4079

[9] Effect of welding parameters on lap shear tensile properties of dissimilar friction stir spot welded AA 5754-H22/2024-T3 joints [J].

Bozkurt, Y. ;

Salman, S. ;

Cam, G. .

SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, 2013, 18 (04) :337-345

[10] The effect of a paint bake treatment on joint performance in friction stir spot welding AA6111-T4 sheet using a pinless tool [J].

Chen, Y. C. ;

Liu, S. F. ;

Bakavos, D. ;

Prangnell, P. B. .

MATERIALS CHEMISTRY AND PHYSICS, 2013, 141 (2-3) :768-775

← 1 2 3 4 →