Effect of Heat Input During Disk Laser Bead-On-Plate Welding of Thermomechanically Rolled Steel on Penetration Characteristics and Porosity Formation in the Weld Metal

Lisiecki, A.

doi:10.1515/amm-2016-0019

Cited by 21 publications

(22 citation statements)

References 14 publications

(8 reference statements)

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“…The reason for this is the complexity of the absorption of laser radiation, heat generation and heat transfer in the region of welding, especially in a case of a keyhole welding mode. The physical processes mentioned above are influenced by many factors such as power density of the laser beam (laser radiation), temperature of the irradiated surface, time of laser beam irradiation, intensity of metal evaporation, plasma plume formation and many others [34]. It was also found that the plastically deformed metal of the tensile sample broken in the base metal, characterized by maximum tensile strength, is delaminated in the fracture zone, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…5 and 6 the microstructure of the weld metal in fusion zone (FZ), as well as the width and microstructure of heat affected zone (HAZ), were significantly dependent on the thermal conditions (heat input) of laser welding and thus subsequent cooling rates. The cooling times between 800 and 500°C were calculated for different heat inputs of autogenous disk laser welding of 5.0 mm thick butt joints of the S700MC steel in the manner described in detail in the ref 34. The results of calculations are given in the Table 5.…”

Section: Resultsmentioning

confidence: 99%

“…Table 7 In general, the lower the heat input of welding, the higher the strength of the test joints in the range of welding parameters. However, it should be emphasized that the heat input, defined as the ratio of laser power and welding speed, is only an auxiliary parameter that may be applied for a comparison of welding thermal conditions only over a narrow range of laser processing parameters, as shown by previous studies discussed in the ref 34. The reason for this is the complexity of the absorption of laser radiation, heat generation and heat transfer in the region of welding, especially in a case of a keyhole welding mode.…”

Section: Resultsmentioning

confidence: 99%

“…Results of these studies are described in detail in the ref 34. The laser beam was focused on the top surface of steel sheets (200 µm spot size) and the beam spot was relatively moved along the edges of the steel plates during welding.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

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Welding of Thermomechanically Rolled Steel by Yb:YAG Disk Laser / Spawanie Stali Walcowanej Termomechanicznie Laserem Dyskowym Yb:YAG

Lisiecki¹

2015

Archives of Metallurgy and Materials

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Autogenous laser welding of 5.0 mm thick butt joints of thermomechanically rolled steel S700MC was investigated. The Yb:YAG disk laser TruDisk 3302 emitted at 1.03 µm was used for the trials of autogenous welding. The effect of laser welding parameters and thus thermal conditions of welding on weld shape, microstructure of weld metal and heat affected zone (HAZ), tensile strength, bending angle, impact toughness and microhardness profile was determined. Studies have shown that it is advantageous to provide a high welding speed and low heat input. High cooling rate of weld metal and HAZ leads to the formation of a favorable structure characterized by a large proportion of fine-grained acicular ferrite and provides high mechanical properties of butt joints.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

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Welding of Thermomechanically Rolled Steel by Yb:YAG Disk Laser / Spawanie Stali Walcowanej Termomechanicznie Laserem Dyskowym Yb:YAG

Lisiecki¹

2015

Archives of Metallurgy and Materials

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“…[1][2][3][4][5][6][7] This new steel grade shows the strength and yield point (1100 MPa) of quenched and tempered low-alloy steels, while being a low-carbon equivalent at a level similar to the typical thermomechanically rolled, fine-grained, microalloyed steels. [8][9][10][11] To be able to use such high strength and performance of this steel grade in practice, it is necessary to provide at least similar properties of the welded joints.…”

Section: Introductionmentioning

confidence: 87%

Impact toughness of laser-welded butt joints of the new steel grade Strenx 1100MC

Kurc-Lisiecka¹

2017

Mater. Tehnol.

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The detailed influence of the energy input of autogenous laser welding by means of a modern solid-state disk laser on the structure of the weld metal, the heat-affected zone and the mechanical properties of 5.0-mm-thick butt joints of STRENX 1100MC was studied. Laser-welding trails were conducted over a wide range of energy inputs, from approximately 100 up to 400 J/mm. The studies showed no tendency for the cracking of butt joints, despite the low energy inputs of the welding. However, a significant decrease in the hardness was revealed in the heat-affected zone. The static tensile strength was found to be slightly lower (by approx. 8 %) compared to the tensile strength of the base material. There was also a strong relationship between the impact toughness of the test joints and the energy input of the laser welding. However, the impact toughness of the laser-welded joints was significantly lower than that of the base material. This article attempts to explain the drop in the toughness and the static tensile strength with respect to the structural transformations of the weld metal and the heat-affected zone, depending on the welding parameters, especially the energy input, and thus the heating conditions of the welding. Keywords: laser welding, high-strength steel, toughness, butt joints, disk laser Preiskovan je bil podroben vpliv dovedene energije avtogenega laserskega varjenja s pomo~jo laserja na SSD-ju na strukturo varjenega jekla, na toplotno vplivano podro~je varjenja (angl. HAZ) in na 5.0-mm debele~elne spoje pri jeklu STRENX 1100MC. Lasersko varjene poteze so bile izvedene v {irokem razponu energijskih vlo`kov, od pribli`no 100 J/mm do 400 J/mm. [tudije so pokazale, da~elni spoji ne pokajo kljub nizko-energijskemu dovajanju energije pri varjenju. Vendar pa se je pokazalao znatno zni`anje mikrotrdote v toplotno vplivani coni. Ugotovljeno je bilo, da je stati~na natezna trdnost nekoliko ni`ja (ca. 8 %) v primerjavi z natezno trdnostjo osnovnega materiala. Ugotovljena je bila tudi mo~na povezava med udarnò ilavostjo testnih spojev in dovedeno energijo med laserskim varjenjem. Kakorkoli, udarna`ilavost lasersko varjenih spojev je bila ob~utno ni`ja kot pri osnovnem materialu.^lanek poizku{a razlo`iti padec`ilavosti in stati~no natezno trdnost glede na strukturne transformacije varjenega jekla in na toplotno prizadeta obmo~ja, odvisno od varilnih parametrov, zlasti dovajanja energije in s tem toplotnih pogojev varjenja. Klju~ne besede: lasersko varjenje, visokotrdno jeklo, trdnost,~elni spoji, laserski disk

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Study of micro-porosity in electron beam butt welding

Das

Dinda

Das

et al. 2022

Int J Adv Manuf Technol

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As complete elimination of porosity from the weld is very difficult, the next option available is to minimize this weld porosity, which is crucial for the safe performance of the welded components. However, this investigation through experiments alone is very tedious and time consuming. Additionally, very limited models are available in the literature for accurate prediction of different porosity attributes. The present study, thus, addressees both the experimental as well as modelling aspect on the study of micro-porosity during Electron Beam Welding (EBW) of SS304 plates. Welding parameters are reported to have significant influence on the micro-porosity. Hence, the influences of these parameters on micro-porosity attributes, namely pores number, average diameter, and sphericity are extensively studied experimentally employing optical microscopy (OM), scanning electron microscopy (SEM), X-ray computed tomography (XCT), and Raman spectroscopy. This is followed by an elaborate modelling through seven popular and wellrecognized Machine Learning Algorithms (MLAs) namely, Multi-Layer Perceptron (MLP), Support Vector Regression (SVR), M5P model trees regression, Reduced Error Pruning Tree (REPTree), Random Forest (RF), Instance-based k-nearest neighbor algorithm (IBk) and Locally Weighted Learning (LWL). These different techniques enhance the chance of obtaining the better predictions of the said micro-porosity attributes by overcoming the effect of data-dependence and other limitations of individual MLAs. The different model-predicted micro-porosity data are also validated through experimental data. Statistical tests and Monte-Carlo reliability analysis are additionally utilized to evaluate the performances of the employed algorithms. IBk and MLP are overall found to perform well.

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Effect of Heat Input During Disk Laser Bead-On-Plate Welding of Thermomechanically Rolled Steel on Penetration Characteristics and Porosity Formation in the Weld Metal

Cited by 21 publications

References 14 publications

Welding of Thermomechanically Rolled Steel by Yb:YAG Disk Laser / Spawanie Stali Walcowanej Termomechanicznie Laserem Dyskowym Yb:YAG

Welding of Thermomechanically Rolled Steel by Yb:YAG Disk Laser / Spawanie Stali Walcowanej Termomechanicznie Laserem Dyskowym Yb:YAG

Impact toughness of laser-welded butt joints of the new steel grade Strenx 1100MC

Study of micro-porosity in electron beam butt welding

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