Enhancement of the fatigue strength of underwater wet welds by grinding and ultrasonic impact treatment

Gao, Wenbin; Wang, Dongpo; Cheng, Fangjie; Deng, Caiyan; Liu, Yang; Xu, Wei

doi:10.1016/j.jmatprotec.2015.04.013

Cited by 58 publications

(21 citation statements)

References 9 publications

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“…The most often used form of underwater welding is wet welding, during which the welding arc and the created welded joint have direct contact with water. The process is carried out with the use of covered electrodes (process 111) or flux corded wires (process 114) [1][2][3][4][5][6]. The water environment intensifies the welding process problems.…”

Section: Introductionmentioning

confidence: 99%

“…The water environment intensifies the welding process problems. The following aspects may be considered the most important steel weldability limiting factors in wet welding [1,2,[7][8][9][10][11]: -rapid cooling rate caused by accelerated heat abstraction from the arc external zone and the weld area. This leads to formation of brittle hardened structures.…”

Section: Introductionmentioning

confidence: 99%

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Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Fydrych

Łabanowski

Tomków

2015

Advances in Materials Science

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Water as the welding environment determines some essential problems influencing steel weldability. Underwater welding of high strength steel joints causes increase susceptibility to cold cracking, which is an effect of much faster heat transfer from the weld area and presence of diffusible hydrogen causing increased metal fragility. The paper evaluates the susceptibility to cold cracking of the high strength S355G10+N steel used, among others, for ocean engineering and hydrotechnical structures, which require underwater welding. It has been found from the CTS test results that the investigated steel is susceptible to cold cracking in the wet welding process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Fydrych

Łabanowski

Tomków

2015

Advances in Materials Science

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“…Direct contact of joined elements and electric arc with water contributes to occurrence of welding defects. The greatest problems are due to susceptibility to cracking, especially cold cracking, of welds made underwater [3,8,10,[13][14][15][16][17]. High cooling rate of welded joint and associated with it tendency to forming hard quenching structures within the HAZ and increased amount of diffusible hydrogen in deposited metal is conducive to the phenomenon [18][19][20][21][22].…”

Section: Tab1 Grades Of Steels Applicable To Pipelines Acc Api 5l mentioning

confidence: 99%

Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

Rogalski

Łabanowski

2017

Polish Maritime Research

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This paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over an assumed acceptance criterion for welded joints in pipes without anticorrosion polymer insulation, were identified. A significant effect of polimer insulation on structure and properties of welded joints, was found.

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“…When the pin contacts with the component surface, the focused energy with a high frequency is transferred to the component, which changes the original stress field, eliminates the tensile residual stresses, and generates a compressive residual stress layer. In addition, UIT could prolong the fatigue life and improve the fatigue resistance even in the corrosive and underwater environment [18][19][20]. Besides, owing to the advantages of easy operation and strong adaptability, UIT is extensively used in the aerospace, automotive, and power industries [21].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

et al. 2020

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In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses have mainly turned into compressive stresses from large tensile stress after the UIT. In the thickness direction, the average decrease of longitudinal residual stress is 259.9 MPa, which is larger than the 149.1 MPa of transverse residual stress. The calculated residual stress distribution after the UIT of the thin plate is compared with that of the thick plate in the literature, with the results showing the stress accumulation layer inside the thick plate. The simulation results show that the elastic strains are decreased slightly and the equivalent plastic strain is increased markedly after UIT, which explains the mechanism of residual stress relaxation.

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Enhancement of the fatigue strength of underwater wet welds by grinding and ultrasonic impact treatment

Cited by 58 publications

References 9 publications

Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Cold Cracking Of Underwater Wet Welded S355G10+N High Strength Steel

Underwater Wet Repair Welding of API 5L X65M Pipeline Steel

Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment

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