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Automated identification of steel weld defects, a convolutional neural network improved machine learning

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 2,   Pages 294-308 doi: 10.1007/s11709-024-1045-7

Abstract: This paper proposes a machine-learning-based methodology to automatically classify different types of steelweld defects, including lack of the fusion, porosity, slag inclusion, and the qualified (no defects)The study first collected percussed data from welded steel members with or without weld defects.transform were implemented and compared to explore the most appropriate features for classification of weldResults showed that STFT achieved higher accuracies (up to 96.63% on average) in the weld status classification

Keywords： steel weld     machine learning     convolutional neural network     weld defect detection     classification task    

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Experimental study on slender buckling-restrained knee braces with round steel bar cores

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 99-121 doi: 10.1007/s11709-022-0875-4

Abstract: study aimed to investigate a novel slender buckling-restrained knee brace damper (BRKB) for welded and weld-freesteel framing systems.The proposed BRKB adopts steel bar cores connected by a central coupler and restrained by tube bucklingconventional buckling restrained braces, and high architectural flexibility for the retrofitting of large-span weld-freeor welded steel moment-resisting systems.

Keywords： weld-free beam-to-column connections     moment-resisting frame     cyclic and compression loading tests     buckling-restrained    

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An adaptive sliding mode control technology for weld seam tracking

Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 1,   Pages 95-101 doi: 10.1007/s11465-015-0332-3

Abstract:

A novel adaptive sliding mode control algorithm is derived to deal with seam tracking control problem of welding robotic manipulator, during the process of large-scale structure component welding. The proposed algorithm does not require the precise dynamic model, and is more practical. Its robustness is verified by the Lyapunov stability theory. The analytical results show that the proposed algorithm enables better high-precision tracking performance with chattering-free than traditional sliding mode control algorithm under various disturbances.

Keywords： weld seam tracking     welding robotic manipulator     adaptive control     sliding mode control    

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Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloy

HUANG Yong, FAN Ding, FAN Qinghua

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4,   Pages 442-447 doi: 10.1007/s11465-007-0076-9

Abstract: When multi-component flux AF305 is used as surface activating flux for an aluminum alloy, the weld peneThe penetration has a relationship with the separate distribution of slag on the weld surface.The relationship between slag distribution and weld penetration was studied by adding aluminum powderDuring welding, the separate distribution of slag on the weld pool results in the great constrictionFinally, the weld penetration is increased.

Keywords： A-TIG welding     surface     DCEN     electrode negative     increase    

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Local fracture properties and dissimilar weld integrity in nuclear power plants

Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 283-290 doi: 10.1007/s11465-013-0250-1

Abstract: local fracture properties in a Alloy52M dissimilar metal welded joint (DMWJ) between A508 ferritic steeland 316 L stainless steel in nuclear power plants were investigated by using the single-edge notchedand near interface zones, the use of the fracture properties ( -resistance curves) of base metals or weld

Keywords： local fracture properties     dissimilar metal welded joint     integrity assessment     strength mismatch     crack growth path    

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Parametric equations for notch stress concentration factors of rib–deck welds under bending loading

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 595-608 doi: 10.1007/s11709-021-0720-1

Abstract: performed a parametric analysis to investigate the effects of multiple geometric parameters of a rib–deck weld

Keywords： notch stress concentration factor     rib–deck weld     parametric analysis     regression analysis     parametric    

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Steel Bridges in China

Pan Jiyan

Strategic Study of CAE 2007, Volume 9, Issue 7,   Pages 18-26

Abstract:

This paper contains a brief introduction of the development of the steelIt also introduces the characteristic requiremens of the material used in steel bridges.

Keywords： steel brigde in China     steel materials     design of steel brigde     structure of steel bridge    

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Experimental investigation and design of aluminum columns with longitudinal welds

Yun WU, Qilin ZHANG

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 3,   Pages 366-373 doi: 10.1007/s11709-011-0101-2

Abstract: except for one column (ZP1217-1) which buckled in the local zone and some columns which failed in the weld

Keywords： aluminum alloy     longitudinal weld     heat-affected zone (HAZ)     reduced strength zone (RSZ)     buckling     column    

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Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1,   Pages 199-214 doi: 10.1007/s11709-019-0592-9

Abstract: Stiffened and unstiffened fillet-welded tube-to-transverse plate connection details are widely used for mast-arm and base-plate connections for highway sign structures. However, due to repetitive wind loads, cyclic fatigue stresses are induced and they are the primary source of failure in welded connections at these locations. The resistance of fatigue critical details has been an on-going research topic because of limited experimental results and the variability in existing fatigue testing results. The main objective of this study is to evaluate fatigue resistance of fillet-welded tube connection details by utilizing the advanced fatigue tool in ANSYS Workbench platform. Finite Element (FE) models development and model validation using existing test data was presented. The resulting fatigue resistance from FE analysis was expressed in terms of fatigue life, fatigue damage, and fatigue safety factor to determine the fatigue performance of fillet-welded connections. Existing fatigue test data was grouped to perform a synthetic analysis and then analysis results were provided to determine input data and fatigue limit for the fatigue module. The local stress level at fatigue critical locations was evaluated using a static FE model for different number of stiffeners and boundary conditions. The results of this investigation provides fatigue resistance of fillet-welded connection details in the form of fatigue life, fatigue damage and safety factor for various connection parameters and structural conditions.

Keywords： fatigue     weld connections     base plate     fillet welds    

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Characteristics of metal magnetic memory signals of different steels under static tension

Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,

Frontiers of Mechanical Engineering 2010, Volume 5, Issue 2,   Pages 226-232 doi: 10.1007/s11465-010-0012-2

Abstract: To study the characteristics of metal magnetic memory (MMM) signals of different steels during tensile test, static tension tests were applied to 30 pieces of Q235 and 16MnR base metal and welded specimens. During the various deformation periods, MMM signals are tested, and micrometallographic is observed. Furthermore, the derivative of magnetic intensity (d/d) is analyzed by mathematical and statistical methods to study the macro and micro corresponding relationships and difference among magnetic signals. Results show that despite the different magnetic intensity () curves of different materials, their d/d patterns in the yielding and necking stages are the same; welded specimens have the similar magnetic signal curves with their base metal, and the welded structure does not interfere with its distribution; different materials have their unique zero point (＝0) before being fractured, which is independent of the fracture location; there is a direct relationship between the intragranular slip and the changes of magnetic signals, which indicates the uneven plastic deformation.

Keywords： metal magnetic memory (MMM)     magnetic intensity (Hp)     static tension     weld    

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On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 3,   Pages 396-410 doi: 10.1007/s11709-023-0934-5

Abstract: In this study, a new system consisting of a combination of braces and steel infill panels called thebraced corrugated steel shear panel (BCSSP) is presented.The results obtained from the parametric study indicate that the corrugated steel shear panel (CSSP)

Keywords： trapezoidal corrugated plate     steel shear panel     braced steel shear panel     experimental study     buckling    

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Progress of Production Technology of Clean Steel at Baosteel

Cui Jian,Zheng Yiyu,Zhu Lixin

Strategic Study of CAE 2005, Volume 7, Issue 6,   Pages 21-26

Abstract: control technology of carbon, nitrogen, total oxygen, phosphorus, sulphur as well as inclusions in steelThe purity obtained in IF steel and pipeline steel is introduced.

Keywords： Baosteel     clean steel     IF steel     pipe line steel     steelmaking    

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Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

Frontiers of Engineering Management 2018, Volume 5, Issue 3,   Pages 334-346 doi: 10.15302/J-FEM-2018011

Abstract: paper uses project organizational theories to draw lessons from a historic megaproject, the Ajaokuta Steel

Keywords： industrial projects     megaprojects     Nigeria     project organizational theories     steel plant    

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Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1020-1035 doi: 10.1007/s11709-019-0534-6

Abstract: important parameters (beam reinforcing plates, initial post-tensioning, and material properties of steelThe PTSC connection is comprised of bolted top and bottom angles as energy dissipaters and steel strandsFurthermore, properties of steel material has been simulated using bilinear elastoplastic modeling with1.5% strain-hardening which has perfectly matched with the real material of steel angles.It is recommended to avoid using steel angles with high yielding strength since they lead to the yielding

Keywords： finite element analysis     hexagonal castellated beam     parametric study     post-tensioned self-centering steelconnection     steel moment-resisting frame    

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Study on steel output per unit GDP and steel production， energy consumption， materials consumption &wastes emission of steel industry

Lu Zhongwu,Yue Qiang,Gao Chengkang

Strategic Study of CAE 2013, Volume 15, Issue 4,   Pages 23-29

Abstract:

Steel output per unit GDP is an important index for controlling steeloutput,  for energy-saving, materials-decreasing and wastes-reducing of steel industry.Steel output and energy consumption,  materials consumption & wastes emission of steel industryof steel output,  energy consumption,  materials consumption & wastes emission.energy-saving, materials-decreasing and wastes-reducing of steel industry were put forward.

Keywords： steel output per unit GDP     steel output     in-use steel     GDP generation per unit in-use steel     energy consumption    

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Title Author Date Type Operation

Automated identification of steel weld defects, a convolutional neural network improved machine learning

Journal Article

Experimental study on slender buckling-restrained knee braces with round steel bar cores

Journal Article

An adaptive sliding mode control technology for weld seam tracking

Jie LIU,Youmin HU,Bo WU,Kaibo ZHOU,Mingfeng GE

Journal Article

Study of mechanism of activating flux increasing weld penetration of AC A-TIG welding for aluminum alloy

HUANG Yong, FAN Ding, FAN Qinghua

Journal Article

Local fracture properties and dissimilar weld integrity in nuclear power plants

Guozhen WANG, Haitao WANG, Fuzhen XUAN, Shantung TU, Changjun LIU

Journal Article

Parametric equations for notch stress concentration factors of rib–deck welds under bending loading

Journal Article

Steel Bridges in China

Pan Jiyan

Journal Article

Experimental investigation and design of aluminum columns with longitudinal welds

Yun WU, Qilin ZHANG

Journal Article

Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

Journal Article

Characteristics of metal magnetic memory signals of different steels under static tension

Yiliang ZHANG, Ruibin GOU, Jimin LI, Gongtian SHEN,

Journal Article

On braced trapezoidal corrugated steel shear panels: An experimental and numerical study

Journal Article

Progress of Production Technology of Clean Steel at Baosteel

Cui Jian,Zheng Yiyu,Zhu Lixin

Journal Article

Causations of failure in megaprojects: A case study of the Ajaokuta Steel Plant project

Oluwole Alfred OLATUNJI

Journal Article

Parametric study of hexagonal castellated beams in post-tensioned self-centering steel connections

Hassan ABEDI SARVESTANI

Journal Article

Study on steel output per unit GDP and steel production， energy consumption， materials consumption &wastes emission of steel industry

Lu Zhongwu,Yue Qiang,Gao Chengkang

Journal Article