Comparative Study on Internal Residual Stresses in Electron Beam Welds

Nagai, Tomoaki; Kawai, Shinji; Shindo, Masatoshi; Okano, Shinji; Mochizuki, Masahito; Suga, Tetsuo

doi:10.2355/isijinternational.isijint-2016-524

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…The experimental material used in this study was API X80 high strength low alloy pipeline steel containing (wt.%): 0.058 C, 0.218 Si, 1.699 Mn, 0.007 P, 0.001 S, 0.226 Cr, 0.218 Ni, 0.247 Mo, 0.006 Cu, 0.029 Al, 0.073 Nb, 0.003 Ca, 0.014 Ti and Fe balanced. For low alloy steels with carbon content less than 0.6 wt.%, the calculation formula of austenite transformation temperature A c1 and A c3 is: 14) A ... (2) where ω refers to the percentage of the mass of elements. Through calculation, the values of A c1 and A c3 are 714°C and 869°C, respectively.…”

Section: Initial Specimen Preparationmentioning

confidence: 99%

“…Owing to the high temperature of the welding process, the structure and properties of the welding joint are greatly different from those of the base material. 2,3) Usually, the welded joints are divided into three areas, 4,5) depending on the degree of influence of Joule heat during the welding process. Because the distance from the welded joint is too far to be affected by the Joule heat, the microstructure of the base metal is not changed.…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Corrosion Resistance of Simulated Weld Heat Affected Zone in High Strength Pipeline Steel Using Electropulsing

Ding

Xiang

et al. 2020

ISIJ Int.

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Subjected to quenching processing, the samples of weld heat affected zone containing microstructures of martensite in high strength pipeline steel were simulated and prepared. Effects of electropulsing treatment on the corrosion resistance of simulated samples were studied through electrochemical detections and immersion corrosion experiments. It was found that the corrosion resistance of pipeline steel decreased sharply due to the high lattice strains/dislocation densities and residual tensile stress developed after martensite transformation by water quenching. Interestingly, treated by electropulsing the corrosion resistance of simulated weld heat affected zone samples was dramatically improved, and even exceeded that of the base metal when the current density achieved 5.2 kA/mm 2. After electropulsing treatment, the dislocation density and residual stress of the investigated samples were reduced largely, and the rust layer generated after corrosion was more compact, so that its corrosion resistance was improved.

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Section: Initial Specimen Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improvement of Corrosion Resistance of Simulated Weld Heat Affected Zone in High Strength Pipeline Steel Using Electropulsing

Ding

Xiang

et al. 2020

ISIJ Int.

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“…A very important factor limiting the service life of functional surfaces or refurbished units, in addition to defects identifiable by nondestructive testing (NDT), is residual stresses. The processes of manufacturing and refurbishment of functional surfaces are mainly based on metallurgical processes, and the levels of residual stresses are significantly influenced by the type of coating technology used [28][29][30][31][32][33][34][35]. For the evaluation of residual tensions around welds and clads, not only nondestructive (such as X-ray) but also semidestructive assessment methods are currently used [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Determination of the Effect of Heat Input during Laser Welding on the Magnitude of Residual Stresses in the Refurbishment of Al Alloy Casting

Viňáš,

Brezinová,

Pástor

et al. 2023

Metals

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The paper presents the results of research on the evaluation of the quality of coating layers made by a laser. The base material, which was Dievar steel (1.2343), was coated with a single layer using additional materials in the form of a wire with a diameter of ø 1.0 mm. As additional material, wires with chemistry corresponding to steels 1.2343 and 1.6356 were used. The primary objective was to verify the possibilities of innovative use of additive materials based on maraging steels, which were chosen from the production of two manufacturers with slightly different chemical compositions. The experiment verified the influence of the cladding parameters on the residual stress values around the fabricated maraging layers. Metallographic analysis by light microscopy was carried out in order to identify the individual structures as well as to assess the occurrence of internal defects in the coatings. The effect of the mixing of the coating metal with the base material was also assessed by means of a low-load hardness assessment, which was carried out in accordance with EN ISO 4063-2. Based on the results, it can be concluded that, in terms of residual stresses, the measured values were approximately the same for all the additive materials used; however, due to the desired mechanical properties of the additively formed layers, it is possible to recommend additive materials based on medium- and high-alloy steels for additive manufacturing.

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ディープホールドリリング法による溶接部残留応力の高精度測定

Mochizuki

OKANO

2023

Transactions of the JSME (In Japanese)

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This paper presents a method to improve accuracy of measuring through-thickness residual stress for welds through deep hole drilling (DHD) technique. The focus of this study is the effect of dimensions of the hollow cylinder, which is manufactured by drilling and trepanning processes, on residual stress measurement at the welds. First, stress concentration-induced plastic region around a reference (drilled) hole was theoretically quantified according to value of existing stress. The plastic region around the hole is not negligible for the welds at where high tensile residual stress exists. In order to reduce the influence of the plastic region, it is considered effective to set a large ratio of trepanning diameter to drilling diameter. Another noteworthy thing is that weld residual stress is present in a relatively narrow region along a weld line. Then, DHD technique was applied to measure through-thickness residual stress at the welds of melt-run welded-plate specimens under conditions of various drilling and trepanning diameters. These DHD residual stress measurement results were compared with those measured by X-ray diffraction and contour methods and calculated by weld thermal elastic-plastic analysis. As the results, it was shown that through-thickness residual stresses measured by DHD technique were obviously influenced by dimensions of the hollow cylinder. Measurement accuracy becomes higher with increasing the ratio of trepanning diameter to drilling diameter. Meanwhile, trepanning diameter should not be larger than width of generation area of high tensile residual stress to be measured at the welds. It was concluded that a method for determining appropriate dimensions of the hollow cylinder to be drilled and trepanned was successfully proposed to accurately assess through-thickness residual stress at the welds through DHD technique.

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Comparative Study on Internal Residual Stresses in Electron Beam Welds

Cited by 3 publications

References 6 publications

Improvement of Corrosion Resistance of Simulated Weld Heat Affected Zone in High Strength Pipeline Steel Using Electropulsing

Improvement of Corrosion Resistance of Simulated Weld Heat Affected Zone in High Strength Pipeline Steel Using Electropulsing

Determination of the Effect of Heat Input during Laser Welding on the Magnitude of Residual Stresses in the Refurbishment of Al Alloy Casting

ディープホールドリリング法による溶接部残留応力の高精度測定

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