scholarly journals Investigation of residual stress distribution and texture evolution in AA7050 stationary shoulder friction stir welded joints

2018 ◽  
Vol 712 ◽  
pp. 531-538 ◽  
Author(s):  
T. Sun ◽  
A.S. Tremsin ◽  
M.J. Roy ◽  
M. Hofmann ◽  
P.B. Prangnell ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Welded Joints ◽  
Texture Evolution ◽  
Residual Stress Distribution ◽  
Friction Stir ◽  
Stationary Shoulder

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.

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

Welding Residual Stress in HDPE Pipes: Measurement and Numerical Simulation

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Yu Sun ◽  
Yun-Fei Jia ◽  
Muhammad Haroon ◽  
Huan-sheng Lai ◽  
Wenchun Jiang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Stress Distribution ◽  
Welded Joints ◽  
Residual Stress Distribution ◽  
Fusion Welding ◽  
Welding Residual Stress ◽  
Hole Drilling ◽  
Radial Depth ◽  
Hdpe Pipes

To understand the residual stress distribution in the welded joints of high density polyethylene (HDPE) pipes is essential to the assessment of its structural integrity. However, limited knowledge of their residual stress was available in this regard. In this paper, the hole-drilling strain-gage method was used to measure the residual stress in the welded seam of HDPE pipes, which was produced by the butt fusion welding technique. The finite element modeling using viscoelastic constitutive model with Prony series was carried out to determine the temperature field and corresponding stress field in the welding stages. The measured residual stress near the surface shows good consistency with the numerical results. It is shown that the residual stress in the hoop direction is much larger than those in the radial and axial directions. The effect of the pipe thickness on the residual stress distribution was also investigated by numerical simulation. The positions of the maximum tensile stress in the welded joints were found within the normalized depth region (the radial depth to the thickness) of 0.2 to 0.8.

scholarly journals Controlling residual stress and distortion of friction stir welding joint by external stationary shoulder

2019 ◽  
Vol 38 (2019) ◽  
pp. 662-671 ◽  
Author(s):  
Weiliang He ◽  
Jinglin Liu ◽  
Wei Hu ◽  
Gongdong Wang ◽  
Wenjing Chen
Keyword(s):  
Residual Stress ◽  
Friction Stir Welding ◽  
Mechanical Model ◽  
Residual Stress Distribution ◽  
Butt Weld ◽  
Friction Stir ◽  
Welding Joint ◽  
Stationary Shoulder ◽  
Stress Region ◽  
Synchronous Rolling

AbstractFriction stir welding (FSW) can achieve a sound welding joint, but its residual stress and distortion cannot be avoided due to the non-uniformity of temperature distribution during welding. Stationary shoulder friction stir welding (SSFSW) was employed to butt weld 6005A-T6 aluminum alloy plates. The effects of welding speeds ranging from 200 mm/min to 600 mm/min on residual stress and distortion were investigated in detail. A thermo-mechanical model was utilized to compare the residual stress distribution between conventional FSW and SSFSW. SSFSW was beneficial to decreasing the peak temperature of stir zone (SZ) and then obtaining a narrower SZ. The peak residual stress produced by SSFSW was 50% lower than that by conventional FSW and a narrower tensile stress region was attained by SSFSW. Moreover, the stationary shoulder applied a function of synchronous rolling during the welding, which controlled the distortion effectively.

Residual Stress Distribution in Butt Welded Joints – Effect of the Weld Groove Shape

2002 ◽  
Vol 404-407 ◽  
pp. 387-392 ◽  
Author(s):  
C. Veiga ◽  
Altino Loureiro ◽  
J.C.P. Pina ◽  
António Castanhola Batista
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Welded Joints ◽  
Residual Stress Distribution ◽  
Groove Shape

scholarly journals RESIDUAL STRESS DISTRIBUTION DURING WELDING UNDER CONDITIONS OF LOW CLIMATIC TEERATURES

2019 ◽  
Vol 2019 (11) ◽  
pp. 4-12
Author(s):  
Юрий Сараев ◽  
Yuriy Saraev ◽  
Николай Голиков ◽  
Nikolay Golikov ◽  
Михаил Сидоров ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Stress Level ◽  
Welded Joints ◽  
Residual Stress Distribution ◽  
Temperature Decrease ◽  
Power Sources ◽  
Welded Structures ◽  
Residual Welding

The investigation of residual welding stresses is extremely essential for the choice of efficient structural forms of designed welded structures and for the correct choice of technological welding methods for manufacturing welded structures. In spite of the substantial data amount obtained as a result of the investigations carried out earlier the distributions of residual stresses and their impact upon working capacity of welded joints carried out during welding under conditions of low climatic temperatures is studied insufficiently. Actually there are no works on experimental investigations of residual stresses of welding under cold climatic conditions. The purpose of the work consists in the investigation of the character of residual stress distribution in end welded joints of structural steel St3sp after welding under low climatic temperature conditions by power sources with pulse and constant parameter measurements. To investigate residual stresses there was carried out plate welding at room and negative air temperatures. There were chosen and carried out two welding modes: pulse-arc welding with modulated current with the frequency of 1.67Hz and direct current welding. The definition of residual stresses was carried out with the use of X-ray method based on the measurement of material lattice micro-deformations caused by their effect. On the basis of the investigation results it was revealed that a welding temperature affects a value and a character of weld stresses. At air temperature decrease up to -45ºC irrespective of the welding mode chosen the increase of a tensile residual welding stress level in welded joints by 40…50% is observed. In comparison with dc welding during welding with modulated current there are formed residual stresses with a lower level of mean values both at room (+20ºC) temperature, and at negative one (-45ºC). The increase of a tensile residual stress level during welding under cold air conditions is connected with the necessity to increase the rate of energy input at welding, and also with the increase of steel strength properties at temperature decrease.

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