Distortion and residual stresses in thick plate weld joint of austenitic stainless steel: Experiments and analysis

Banik, Sayantan Das; Kumar, Suranjit; Singh, Pawan Kumar; Bhattacharya, S.; Mahapatra, Manas Mohan

doi:10.1016/j.jmatprotec.2020.116944

Cited by 52 publications

(13 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Distorsi pada las juga mengindikasikan terjadinya tegangan sisa pada logam las. Semakin besar distorsi, tegangan sisa pada pengelasan juga semakin besar [7] [8].…”

Section: Pendahuluanunclassified

Pengaruh Temperatur Preheat Terhadap Distorsi Dan Struktur Mikro Sambungan Las Tak Sejenis Antara Baja Karbon Astm A36 Dan Baja Tahan Karat Austenitik Aisi 304 Menggunakan Gmaw

Wicaksono¹,

Ilman

2021

Technologic

View full text Add to dashboard Cite

Sambungan las pada umumnya adalah titik lemah dari suatu struktur dan sering menjadi lokasi kegagalan pada pengelasan logam tidak sejenis. Berbagai upaya telah dilakukan untuk meningkatkan kualitas dan performa dari sambungan las, salah satunya adalah pemanasan awal (preheat). Penelitian ini bertujuan mempelajari pengaruh temperatur preheat terhadap sambungan las logam tak sejenis antara baja paduan rendah dan baja tahan karat austenitik. Proses pengelasan dilakukan menggunakan las busur logamgas atau gas metal arc welding (GMAW) dengan elektrode ER70s-6 dan selama proses pengelasan dilakukan preheat pada temperatur 100oC, 150oC, dan 200oC. Temperatur selama proses pengelasan diukur menggunakan termokopel pada jarak 10 mm dari garis las. Setelah proses pengelasan dilakukan, pengukuran distorsi dilakukan menggunakan dial indicator. Pengamatan struktur mikro dilakukan pada daerah terpengaruh panas (HAZ), daerah las, dan daerah logam induk dari masing-masing pelat yang dilas menggunakan mikroskop optik. Berdasarkan hasil pengukuran siklus termal, dapat disimpulkan bahwa peningkatan temperatur preheat meningkatkan temperatur puncak dan memperlambat laju pendinginan las. Perubahan siklus termal ini berpengaruh terhadap struktur mikro. Berdasarkan hasil pengukuran distorsi, pelat yang dilas mengalai penurunan distorsi pada arah longitudinal dan transversal terhadap garis las seiring dengan meningkatnya temperatur preheat

show abstract

“…Distorsi pada las juga mengindikasikan terjadinya tegangan sisa pada logam las. Semakin besar distorsi, tegangan sisa pada pengelasan juga semakin besar [7] [8].…”

Section: Pendahuluanunclassified

Pengaruh Temperatur Preheat Terhadap Distorsi Dan Struktur Mikro Sambungan Las Tak Sejenis Antara Baja Karbon Astm A36 Dan Baja Tahan Karat Austenitik Aisi 304 Menggunakan Gmaw

Wicaksono¹,

Ilman

2021

Technologic

View full text Add to dashboard Cite

show abstract

“…Various constructional and technological methods can be used to reduce the adverse impact of welding stresses and deformations on the structure being produced. Currently, the most important methods of reducing welding distortion are [7][8][9][10][11][12][13][14][15][16][17][18]: pre-welding, in transient welding distortion, and post-welding distortion prevention method. As a rule, the pre-welding distortion prevention method uses properly designed welding guns.…”

Section: Introductionmentioning

confidence: 99%

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

View full text Add to dashboard Cite

The article presents an innovative method of reducing welding distortions of thin-walled structures by introducing structural and technological changes. The accuracy of the method was demonstrated on the example of welding the stub pipes to the outer surface of a thin-walled tank with large dimensions, made of steel 1.4301 with a wall thickness of 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), distortions of the base are formed, the flatness deviation of which was 11.9 × 10−3 (m) and exceeded the permissible standards. As a result of structural and technological changes, not only does the joint stiffness increase, but also a favorable stress state is introduced in the flange, which reduces the local welding stresses. Numerical models were developed using the finite element method (FEM), which were used to analyze the residual stresses and strains pre-welding, in extruded flanges, in transient, and post-welding. The results of the calculations for various flanges heights show that there is a limit height h = 9.2 × 10−3 (m), above which flange cracks during extrusion. A function for calculating the flange height was developed due to the required stress state. The results of numerical calculations were verified experimentally on a designed and built test stand for extrusion the flange. The results of experimental research confirmed the results of numerical simulations. For further tests, bases with a flange h = 6 × 10−3 (m) were used, to which a stub pipe was welded using the GTAW method. After the welding process, the distortion of the base was measured with the ATOS III scanner (GOM a Zeiss company, Oberkochen, Germany). It has been shown that the developed methodology is correct, and the introduced structural and technological changes result in a favorable reduction of welding stresses and a reduction in the flatness deviation of the base in the welded joint to 0.39 × 10−3 (m), which meets the requirements of the standards.

show abstract

“…Residual stress, a tensor quantity, are locked-in stresses within a component without external loading, generated as a result of complex non-linear thermal-mechanical processing during manufacturing. Most manufacturing processes introduce residual stress that has a direct bearing on manufacturing (e.g., undesirable distortion) and on the resilience of products in service and their design life [1][2][3][4][5][6]. Historically, residual stresses have primarily been incorporated into structure critical component design through a significant safety factor because they are challenging to characterise and control, and there is little design guidance in codes and standards.…”

Section: Introductionmentioning

confidence: 99%

Comparison Between Surface and Near-Surface Residual Stress Measurement Techniques Using a Standard Four-Point-Bend Specimen

Rahimi

Violatos

2021

Exp Mech

View full text Add to dashboard Cite

Background Determination of near-surface residual stresses is challenging for the available measurement techniques due to their limitations. These are often either beyond reach or associated with significant uncertainties. Objective This study describes a critical comparison between three methods of surface and near-surface residual stress measurements, including x-ray diffraction (XRD) and two incremental central hole-drilling techniques one based on strain-gauge rosette and the other based on electronic speckle pattern interferometry (ESPI). Methods These measurements were performed on standard four-point-bend beams of steel loaded to known nominal stresses, according to the ASTM standard. These were to evaluate the sensitivity of different techniques to the variation in the nominal stress, and their associated uncertainties. Results The XRD data showed very good correlations with the surface nominal stress, and with superb repeatability and small uncertainties. The results of the ESPI based hole-drilling technique were also in a good agreement with the XRD data and the expected nominal stress. However, those obtained by the strain gauge rosette based hole-drilling technique were not matching well with the data obtained by the other techniques nor with the nominal stress. This was found to be due to the generation of extensive compressive residual stress during surface preparation for strain gauge installation. Conclusion The ESPI method is proven to be the most suitable hole-drilling technique for measuring near-surface residual stresses within distances close to the surface that are beyond the penetration depth of x-ray and below the resolution of the strain gauge rosette based hole-drilling method.

show abstract

Distortion and residual stresses in thick plate weld joint of austenitic stainless steel: Experiments and analysis

Cited by 52 publications

References 18 publications

Pengaruh Temperatur Preheat Terhadap Distorsi Dan Struktur Mikro Sambungan Las Tak Sejenis Antara Baja Karbon Astm A36 Dan Baja Tahan Karat Austenitik Aisi 304 Menggunakan Gmaw

Pengaruh Temperatur Preheat Terhadap Distorsi Dan Struktur Mikro Sambungan Las Tak Sejenis Antara Baja Karbon Astm A36 Dan Baja Tahan Karat Austenitik Aisi 304 Menggunakan Gmaw

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Comparison Between Surface and Near-Surface Residual Stress Measurement Techniques Using a Standard Four-Point-Bend Specimen

Contact Info

Product

Resources

About