Experimental and Numerical Study of Multi-Pass Welding Process of Pipe-Flange Joints

Troive, Lars; Näsström, Mats; Jönsson, Mikael

doi:10.1115/1.2842053

Cited by 15 publications

(12 citation statements)

References 1 publication

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“…A new dental-foam method was developed for experimental measurement of axial distortions in flange. Teng and Chang [19] using axi-symmetric FE model for pipe-pipe joint, studied the effect of pipe diameter and wall thickness on residual stresses and results were found in agreement with the Rybicki et al [20][21]. Abid and Siddique [22][23][24][25][26][27][28][29][30][31][32][33][34][35] has performed a detailed parametric welding simulation of pipeflange joints and have studied the effect of welding, geometric and other parameter on residual stresses and welding distortion.…”

Section: Introductionsupporting

confidence: 61%

Investigation of Residual Stresses and Distortion in Welded Pipe-Flange Joint of Different Classes

Abid

2012

IIUMEJ

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Pipe and flange joints are commonly used in petrochemical, nuclear and process industries. Commonly, welding is used to make these joints which produces residual stresses and distortions. These stresses have detrimental effects on the structural integrity and service performance of the welded pipe joints. The objective of this study is to investigate the residual stresses and distortions during Gas Metal Arc Welding of pipe of schedule 40, nominal diameter 200 mm with different ANSI flanges of class numbers 150, 300, 600, 900, 1500, and 2500. Welding parameters including: voltage, current and heat as inputs were selected based on the literature available. The behaviour of the flanges of different classes is also discussed. In addition, the finite element methodology presented, in this paper, can be helpful for developing welding procedures for a range of pipe flange welded joint sizes in order to control the residual stresses and deformations. This will lead to optimised performance during bolt up and operating conditions.ABSTRAK: Paip dan sambungan flan biasanya digunakan dalam industri petrokimia, nuklear dan proses. Kimpalan menghasilkan tegasan sisa dan herotan, yang memberikan kesan yang merbahaya ke atas integriti struktur dan prestasi servis sambungan kimpalan paip. Objektif kajian ini adalah untuk mengkaji tegasan sisa dan herotan ketika kimpalan arka logam gas paip berjadual 40, diameter nominal 200mm dengan flan ANSI yang berbeza kelas # 150, 300, 600, 900, 1500, dan 2500. Parameter kimpalan termasuklah; voltan, arus dan haba input yang dipilih berdasarkan literatur sediada. Kelakuan flan yang berbeza kelas telah dibincangkan. Kaedah elemen finit yang dibentangkan adalah berguna dalam membangunkan prosedur kimpalan bagi julat saiz kimpalan flan paip unutk mengawal tegasan sisa dan canggaan i.e. bagi mengoptimakan prestasi ketika bolt up dan sedang beroperasi.Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â KEYWORDS:Â finite element; residual stresses; distortion; welding; pipe-flange joint; different classes

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Section: Introductionsupporting

confidence: 61%

Investigation of Residual Stresses and Distortion in Welded Pipe-Flange Joint of Different Classes

Abid

2012

IIUMEJ

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“…The numerical approaches applied to the problems of build-up and multipass welding are reviewed in [2,Chap. 3] and [15,16]. A specific feature of growing (building-up) processes is that the vector of total displacements discontinues on the growth surface.…”

Section: Introductionmentioning

confidence: 99%

Modelling of residual stresses developed in steel cylinders subjected to surface-layer deposition by welding

et al. 2008

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A new model for the determination of the residual stress-strain and microstructural state of a cylinder subjected to layer deposition by welding is developed. The growing body of theory and unified the Bodner-Partom viscoplastic theory generalized for the case of coupled thermomechanic processes are involved to describe the mechanical behavior of the material. Continuous cooling transformation (CCT) diagrams are used to account for microstructural transformation. The concept of eigenstrains and temperature state is utilized to satisfy the boundary conditions on the growing surface. A time-stepping procedure and a finite-element technique are used to simulate both the instantaneous and the residual stress-strain and microstructural state of a deposited cylinder. The influence of initial temperature on the residual stress-strain and the structural states of the cylinder deposited by austenitic and martensitic steel layers is investigated. It is discovered that martensite and bainite shares in the heat-affected zone can be effectively controlled by the initial temperature of the cylinder. Numerical and experimental results are compared.

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“…Teng et al 12 investigated the effect of welding sequence on residual stresses in single-pass and multi-pass butt-welded plates and circular patch welds using finite element method. Troive et al 13 investigated the effect of welding sequence on out-of-plane distortions in fillet weld of a multi-pass pipe-flange joint using finite element method. Sattari-Far and Javadi 14 investigated the effect of welding sequence on distortions in pipe-pipe joints using finite element method.…”

Section: Introductionmentioning

confidence: 99%

Effect of welding sequence and direction on angular distortions in butt-welded plates

Choobi

Haghpanahi

Sedighi

2011

The Journal of Strain Analysis for Engineering Design

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During arc welding process, non-uniform heating and cooling lead to non-uniform expansion and contraction of the weld and surrounding base metal which result in undesirable residual stresses and distortions in the welded joint. Among different types of welding distortions, angular distortions produced by butt welding of plates are of major concern in industry. Various methods are currently being used to control and reduce angular distortions. Among different types of distortion control methods the ones which can also reduce residual stresses are preferred. In this paper, the effect of welding sequence and direction on reduction of welding-induced angular distortions in single-pass butt-welded 304 stainless plates and also their effect on residual stresses are investigated by numerical simulation. Welding simulation has been performed using a three-dimensional thermo-elastic-plastic finite element model. In order to verify the numerical model, experiments have also been carried out and temperature histories, angular distortions and residual stresses have been measured. The results of this study showed that welding sequence and direction have a great influence on angular distortions. The results revealed that welding symmetrically from center towards the edges of the plate not only decreases angular distortions but also reduces residual stresses. Thus, welding symmetrically from center towards the edges of the plate can be used as a cost-effective method for mitigating angular distortions in butt-welded plates.

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Experimental and Numerical Study of Multi-Pass Welding Process of Pipe-Flange Joints

Cited by 15 publications

References 1 publication

Investigation of Residual Stresses and Distortion in Welded Pipe-Flange Joint of Different Classes

Investigation of Residual Stresses and Distortion in Welded Pipe-Flange Joint of Different Classes

Modelling of residual stresses developed in steel cylinders subjected to surface-layer deposition by welding

Effect of welding sequence and direction on angular distortions in butt-welded plates

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