Elongated bead weld method for improvement of fatigue properties in welded joints of ship hull structures using low transformation temperature welding materials

2017 ◽  
Vol 61 (4) ◽  
pp. 769-788 ◽  
Author(s):  
C. Shiga ◽  
H. Murakawa ◽  
K. Hiraoka ◽  
N. Osawa ◽  
H. Yajima ◽  
...  
Keyword(s):  
Welded Joints ◽  
Transformation Temperature ◽  
Ship Hull ◽  
Fatigue Properties ◽  
Welding Materials

scholarly journals Investigation of the Residual Stress in a Multi-Pass T-Welded Joint Using Low Transformation Temperature Welding Wire

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 325
Author(s):  
Zhongyuan Feng ◽  
Ninshu Ma ◽  
Seiichiro Tsutsumi ◽  
Fenggui Lu
Keyword(s):  
Residual Stress ◽  
Welded Joints ◽  
Transformation Temperature ◽  
Compressive Residual Stress ◽  
Welded Joint ◽  
Numerical Study ◽  
Weld Zone ◽  
Welding Wire ◽  
Finish Temperature ◽  
Welding Materials

We investigated whether low transformation temperature (LTT) welding materials are beneficial to the generation of compressive residual stress around a weld zone, thus enhancing the fatigue performance of the welded joint. An experimental and numerical study were conducted in order to analyze the residual stress in multi-pass T-welded joints using LTT welding wire. It was found that, compared to the conventional welded joint, greater tensile residual stress was induced in the flange plate of the LTT welded joints. This was attributed to the reheat temperature of the LTT weld pass during the multi-pass welding. The formerly-formed LTT weld pass with a reheat temperature lower than the austenite finish temperature converted the compressive residual stress into tensile stress. The compressive residual stress was generated in the regions with a reheat temperature higher than the austenite finish temperature, indicating that LTT welding materials are more suitable for single-pass welding.

Effect of Vibration on Microstructure and Fatigue Properties of 6082 CMT-Welded Joints

2021 ◽  
Author(s):  
Pengfei Zheng ◽  
Qinghua Lu ◽  
Peilei Zhang ◽  
Hua Yan ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Welded Joints ◽  
Fatigue Properties

scholarly journals Welding of pipes in fixed position with internal anti-corrosion protection of joints

2021 ◽  
Vol 225 ◽  
pp. 05005
Author(s):  
Elena Bogomazova ◽  
Irina Ziyatdinova ◽  
Dmitriy Aiduganov ◽  
Anna Pershina ◽  
Alexey Anikeyev
Keyword(s):  
Corrosion Protection ◽  
Welded Joints ◽  
Oil And Gas ◽  
Negative Impact ◽  
Fixed Position ◽  
Inner Surface ◽  
Transition Structures ◽  
Oil And Gas Pipelines ◽  
Clad Steel ◽  
Welding Materials

The article reviews the weldability of clad steel used for protection of inner surface of oil-and-gas pipelines from corrosion by different welding materials. It is indicated that during welding of the root pass by stainless electrodes in one pass the transition structures appear on the interface of two dissimelar metals. This process leads to the formaion of cracks. To reduce negative impact of the transition structures on the characteristics of welded joints it is recommended to weld the first two passes with strainless electrodes.

Analysis of martensite transformation behaviour in welded joints of low transformation-temperature materials

2009 ◽  
Vol 23 (6) ◽  
pp. 411-421 ◽  
Author(s):  
Junji Yamamoto ◽  
Susumu Meguro ◽  
Yoshiki Muramatsu ◽  
Naoya Hayakawa ◽  
Kazuo Hiraoka
Keyword(s):  
Welded Joints ◽  
Transformation Temperature ◽  
Martensite Transformation ◽  
Transformation Behaviour

Fatigue Properties of Welded Joints of High-Carbon Steels

2007 ◽  
pp. 47-54
Author(s):  
Attila Magasdi ◽  
János Dobránszky ◽  
F. Tusz ◽  
János Ginsztler
Keyword(s):  
Welded Joints ◽  
Carbon Steels ◽  
Fatigue Properties ◽  
High Carbon

scholarly journals Fatigue Life Improvement of the High Strength Steel Welded Joints by Ultrasonic Impact Peening

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 619 ◽  
Author(s):  
Ján Lago ◽  
Libor Trško ◽  
Michal Jambor ◽  
František Nový ◽  
Otakar Bokůvka ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Welded Joints ◽  
Compressive Residual Stress ◽  
High Strength ◽  
Fatigue Properties ◽  
Low Alloy Steel ◽  
Residual Stress Field ◽  
Near Surface ◽  
Life Improvement

Ultrasonic impact peening was applied on welded joints manufactured from Strenx 700 MC high strength low alloy steel with the aim to improve the fatigue properties. Three different surface treatment parameters were tested, which resulted in transformation of the near-surface tensile residual stresses in the weld metal and heat affected zone to compressive residual stress field, while maximal values from −400 MPa up to −800 MPa were reached. The highest fatigue life improvement was reached by the double peening with the 85 N contact force, where the fatigue limit for N = 108 cycles increased from 370 MPa to 410 MPa.

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