Residual stress distribution and microstructure in the friction stir weld of 7075 aluminum alloy

2015 ◽  
Vol 50 (22) ◽  
pp. 7262-7270 ◽  
Author(s):  
Pengfei Ji ◽  
Zhongyu Yang ◽  
Jin Zhang ◽  
Lin Zheng ◽  
Vincent Ji ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
Friction Stir Weld ◽  
7075 Aluminum Alloy ◽  
Friction Stir

scholarly journals The Contour Method for Residual Stress Determination Applied to an AA6082-T6 Friction Stir Butt Weld

2011 ◽  
Vol 681 ◽  
pp. 177-181 ◽  
Author(s):  
Valentin Richter-Trummer ◽  
Pedro Miguel Guimarães Pires Moreira ◽  
João Ribeiro ◽  
Paulo Manuel Salgado Tavares de Castro
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Cross Section ◽  
Residual Stress Distribution ◽  
Contour Method ◽  
Friction Stir Weld ◽  
Hole Drilling ◽  
Butt Weld ◽  
Friction Stir

Residual stresses parallel to the welding direction on a cross-section of a 3 mm thick friction stir butt-welded aluminum alloy AA6082-T6 plate were determined using the contour method. A full contour map of longitudinal residual stresses on a weld cross section was determined in this way, revealing detailed information on the residual stress distribution in the inside of a friction stir weld, especially in the nugget zone. The typical M-shape, usually described for the residual stress distribution in friction stir welds, was found. The maximum residual stresses are below the yield strength of the material in the shoulder region and, outside of the welding region, low tensile and compressive residual stresses are responsible for the necessary stress equilibrium on the plane of interest. A comparison was made with the established incremental hole drilling technique on an equivalent plate for validation and good agreement of both techniques was obtained. The distribution, as well as the magnitude of the residual stresses measured by both techniques, is very similar, thus validating both the experimental and numerical procedures used for the contour method application, presented and discussed in the present paper.

Residual Stress Distribution of Non-Uniform Quenching in Al-Zn-Mg-Cu Aluminum Alloy Thick Plate

2020 ◽  
Vol 1003 ◽  
pp. 11-19
Author(s):  
Ya Nan Li ◽  
Yong An Zhang ◽  
Hong Lei Liu ◽  
Xin Yu Lv ◽  
Xi Wu Li ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Residual Stress ◽  
Aluminum Alloy ◽  
Heat Transfer Coefficient ◽  
Stress Distribution ◽  
Transfer Coefficient ◽  
Stress Level ◽  
Transverse Direction ◽  
Residual Stress Distribution ◽  
Surface Quenching

Effect of multi-section linear non-uniform heat transfer coefficient on quenching residual stress distribution in 27mm-thick Al-Zn-Mg-Cu aluminum alloy plate was simulation studied by using the finite element method, and the surface quenching residual stress distribution was measured by the X-ray diffraction method and hole-drilling method. The results show that the surface quenching residual stress represents the same distribution with non-uniform heat transfer coefficient in the transverse direction and the stress level maintains initial stress level of the heat transfer coefficient at each location. The distribution of the quenching residual stress in the center of the plate is approximately uniform and the stress level is approximately equal to average of maximum and minimum initial stress level. The measured surface quenching residual stress shows a wavy distribution in the transverse direction, which is similar to the simulated surface stress distribution without considering the stress level. The measurement results can be explained by the multi-section linear non-uniform quenching model.

Comparison of Residual Stress Between MIG Welding and Friction Stir Welding

2012 ◽  
Vol 155-156 ◽  
pp. 1218-1222
Author(s):  
Lei Wang ◽  
Mitsuyosi Tsunori
Keyword(s):  
Residual Stress ◽  
Friction Stir Welding ◽  
Stress Distribution ◽  
Yield Strength ◽  
Room Temperature ◽  
Welding Process ◽  
Residual Stress Distribution ◽  
Mig Welding ◽  
Friction Stir ◽  
Friction Stir Welding Process

Residual stress distribution plays a very important role in welded structures, the aim of present work is to find out the effect of different welding methods on the residual stress distribution by means of neutron diffraction measurements and FE models simulation. 4 mm thick DH-36 steel plates were butt welded by MIG welding process and 5 mm thick AA 2024 aluminium alloy plates were butt welded by friction stir welding process. Results show that residual stresses of MIG welding process are higher than those of friction stir welding process. The peak residual stress of MIG weld is close to the room temperature uniaxial yield strength of DH-36 while the peak residual stress of friction stir weld is just about 50% of the room temperature uniaxial yield strength of AA2024. The size effect of MIG welded and effect of welding speeds of friction stir welded on the residual stress distribution have also been studied in the paper.

Research on the Residual Stress of Aluminum Alloy (LF6) Welding

2013 ◽  
Vol 546 ◽  
pp. 127-131
Author(s):  
Zhi Qing Guo ◽  
Qiu Juan Lv ◽  
Yan Jiao Li ◽  
Chang Jiang Liu ◽  
Fang Xie
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Experimental Study ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Residual Stress Distribution ◽  
Welding Residual Stress ◽  
Welding Seam ◽  
Maximum Value

This paper use the software ANSYS to study the aluminum alloy (LF6) welding residual stress by numerical simulation and experimental study. The result indicates that the aluminum alloy (LF6) has the same residual stress distribution with others, there is a maximum value existing at the range of 4-5mm near the welding seam.

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