INFLUENCE OF RESIDUAL STRESS REDUCTION BY LOCAL HEATING ON FATIGUE RESISTANCE OF FILLET BOX WELDED JOINTS

2021 ◽  
Vol 77 (3) ◽  
pp. 475-488
Author(s):  
Mikihito HIROHATA ◽  
Kazunori ANI ◽  
Toshimitsu SUZUKI ◽  
Hideaki KONISHI
Keyword(s):  
Residual Stress ◽  
Fatigue Resistance ◽  
Stress Reduction ◽  
Welded Joints ◽  
Local Heating

scholarly journals RESIDUAL STRESS REDUCTION OF FILLET BOX WELDED JOINTS BY LOCAL HEATING USING INDUCTION HEATING DEVICE

2020 ◽  
Vol 8 (1) ◽  
pp. 194-206
Author(s):  
Mikihito HIROHATA ◽  
May Phyo AUNG ◽  
Kazunori ANI
Keyword(s):  
Residual Stress ◽  
Induction Heating ◽  
Stress Reduction ◽  
Welded Joints ◽  
Local Heating ◽  
Heating Device

Determination of the parameters of local heating for increasing the fatigue resistance of welded joints

1985 ◽  
Vol 17 (4) ◽  
pp. 479-483
Author(s):  
V. N. Maksimovich ◽  
A. A. Chabanenko ◽  
P. P. Mikheev ◽  
O. I. Gushcha ◽  
Yu. F. Kudryavtsev
Keyword(s):  
Fatigue Resistance ◽  
Welded Joints ◽  
Local Heating

scholarly journals Analisis Perbandingan Metode Pengelasan untuk Mengendalikan Distorsi dan Tegangan Sisa – Review

2020 ◽  
Vol 5 (2) ◽  
pp. 95-102
Author(s):  
Heri Wibowo
Keyword(s):  
Residual Stress ◽  
Fatigue Resistance ◽  
Welded Joints ◽  
Arc Welding ◽  
Repair Work ◽  
Advantages And Disadvantages ◽  
Welding Method ◽  
Thermal Tensioning ◽  
Transient Thermal ◽  
Fabrication Costs

Distortion and residual stress can have undesirable effects on weldments, such as repair work and higher fabrication costs. This study compares welding methods in reducing distortion and residual stress to obtain advantages and disadvantages. The study focused on reviewing several journals from previous research that focused on comparing welding methods. The results show that the Dynamically Controlled Low-Stress No Distortion (DC-LSND) welding method has the most significant ability to reduce distortion and residual stress and does not reduce the weld joint's fatigue resistance. The welding methods of static thermal tensioning (STT) and Transient thermal tensioning (TTT) can significantly decrease distortion and residual stress.  They can improve the fatigue resistance of welded joints. The Double Side Arc Welding (DSAW) method effectively reduces distortion. However, the application in large construction welds is difficult to achieve. Distorsi dan tegangan sisa memberikan pengaruh yang tidak diinginkan pada pengelasan seperti perlunya pekerjaan perbaikan dan meningkatnya biaya fabrikasi. Tujuan penelitian adalah membandingkan metode pengelasan untuk mereduksi distorsi dan tegangan sisa untuk memperoleh kelebihan dan kekurangan. Metode penelitian dilakukan dengan review beberapa literatur jurnal hasil penelitian sebelumnya yang difokuskan pada perbandingan metode pengelasan dalam mereduksi distorsi dan tegangan sisa. Hasil penelitian menunjukkan metode las dynamically controlled low stress no distortion (DC-LSND) memiliki kemampuan mereduksi distorsi dan tegangan sisa paling efektif dan tidak menurunkan ketahanan fatik sambungan las, metode las static thermal tensioning (STT) dan transient thermal tensioning (TTT) memiliki kemampuan mereduksi distorsi dan tegangan sisa dengan signifikan serta mampu meningkatkan ketahanan fatik sambungan las, metode las doublé side arc welding (DSAW) efektif mereduksi distorsi namun sulit diterapkan pada pengelasan konstruksi yang besar.

scholarly journals Generalized SCF Formula of Out-Of-Plane Gusset Welded Joints and Assessment of Fatigue Life Extension by Additional Weld

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1249
Author(s):  
Yixun Wang ◽  
Yuxiao Luo ◽  
Yuki Kotani ◽  
Seiichiro Tsutsumi
Keyword(s):  
Fatigue Life ◽  
Fatigue Resistance ◽  
Welded Joints ◽  
Life Extension ◽  
Leg Length ◽  
Notch Stress ◽  
Out Of Plane ◽  
Weld Toe ◽  
Effective Notch Stress ◽  
Geometric Effects

The existing S-N curves by effective notch stress to assess the fatigue life of gusset welded joints can result in reduced accuracy due to the oversimplification of bead geometries. The present work proposes the parametric formulae of stress concentration factor (SCF) for as-welded gusset joints based on the spline model, by which the effective notch stress can be accurately calculated for fatigue resistance assessment. The spline model is also modified to make it applicable to the additional weld. The fatigue resistance of as-welded and additional-welded specimens is assessed considering the geometric effects and weld profiles. The results show that the error of SCFs by the proposed formulae is proven to be smaller than 5%. The additional weld can increase the fatigue life by as great as 9.4 times, mainly because the increasing weld toe radius and weld leg length lead to the smaller SCF. The proposed series of S-N curves, considering different SCFs, can be used to assess the welded joints with various geometric parameters and weld profiles.

Residual Stress Release and Its Effects on the Fatigue Strength of Typical Welded Joints in Cone-Cylinder Pressure Structures

2021 ◽  
Vol 111 ◽  
pp. 102673
Author(s):  
Liangbi Li ◽  
Jingxi Zhang ◽  
Yiwen Zhang ◽  
Deqin Zhu ◽  
Zhengquan Wan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Strength ◽  
Welded Joints ◽  
Cylinder Pressure ◽  
Stress Release

scholarly journals Optimization Study of Post-Weld Heat Treatment for 12Cr1MoV Pipe Welded Joint

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 127
Author(s):  
Zichen Liu ◽  
Xiaodong Hu ◽  
Zhiwei Yang ◽  
Bin Yang ◽  
Jingkai Chen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Stress Reduction ◽  
Simulation Method ◽  
Post Weld Heat Treatment ◽  
Residual Stress Field ◽  
Element Analysis ◽  
Tempering Treatment ◽  
Temper Heat Treatment ◽  
Weld Heat

In order to clarify the role of different post-weld heat treatment processes in the manufacturing process, welding tests, post-weld heat treatment tests, and finite element analysis (FEA) are carried out for 12C1MoV steel pipes. The simulated temperature field and residual stress field agree well with the measured results, which indicates that the simulation method is available. The influence of post-weld heat treatment process parameters on residual stress reduction results is further analyzed. It is found that the post weld dehydrogenation treatment could not release residual stress obviously. However, the residual stress can be relieved by 65% with tempering treatment. The stress relief effect of “post weld dehydrogenation treatment + temper heat treatment” is same with that of “temper heat treatment”. The higher the temperature, the greater the residual stress reduction, when the peak temperature is at 650–750 °C, especially for the stress concentration area. The longer holding time has no obvious positive effect on the reduction of residual stress.

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