Effect of Welding Speed on the Prediction Accuracy of Residual Stress in Laser Welded 1.2 mm Thick Dual Phase Steel

Mitra, Subhajit; Arora, Kanwer Singh; Bhattacharya, Baby; Singh, Shiv Brat

doi:10.1007/s40516-019-00107-w

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…The same directly proportional relationship between the level of residual stresses and the cooling rate was observed in the tests conducted by Mitra et al. (2020b) .…”

Section: Introductionsupporting

confidence: 74%

“…The same directly proportional relationship between the level of residual stresses and the cooling rate was observed in the tests conducted by Mitra et al (2020b). In this work, a set of 1.2 mm thick DP600 steel sheets was welded with fiber laser equipment, using eight different welding speeds while changing power to maintain heat input around 25 J/mm.…”

Section: Laser Welding Of Dual Phase Sheetssupporting

confidence: 58%

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Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Mansur¹,

Mansur²,

Carvalho

et al. 2021

Heliyon

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Dual Phase steels are one of the most used advanced high-strength materials in the industry, due to its combination of a ductile ferritic matrix and disperse hard martensite islands, which provide outstanding mechanical properties for components to be cold stamped. This work investigated fiber laser welding applicability in Dual Phase 600 1.6 mm thick steel sheets, evaluating potential welding impacts on properties of the material for industrial applications. A first set of bead-on-plate welds was generated to define best parameters for subsequent tests. A second set was prepared, consisting of butt joints welded in the optimized condition. Weld microstructure was characterized as 100% martensitic at fusion zone (FZ), with growing fractions of ferrite at Heat Affected Zone (HAZ) as one moves away from fusion line. Hardness is around 60% higher at FZ than at BM, being maximum at supercritical HAZ due to its highly refined microstructure and HAZ softening was not observed. Tensile and Erichsen cupping tests presented similar strength results between welded and non-welded specimens, with slight ductility reduction. Finally, numeric simulations based on Finite Element Analysis were carried out to estimate temperature evolution, phase proportions, residual stresses and distortion levels, achieving excellent agreement with experimental results.

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“…The same directly proportional relationship between the level of residual stresses and the cooling rate was observed in the tests conducted by Mitra et al. (2020b) .…”

Section: Introductionsupporting

confidence: 74%

Section: Laser Welding Of Dual Phase Sheetssupporting

confidence: 58%

Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Mansur¹,

Mansur²,

Carvalho

et al. 2021

Heliyon

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show abstract

“…Previous research has investigated the working concept (cos-α) and the relevance of the analysis to weldments. [24][25][26][27] The microhardness of the weldment was determined using a Vickers hardness tester (MMT-X) M/S (MATSUZAWA). Microhardness survey of the weldment cross-section includes BM on the right side, heat-affected zone (HAZ), and weld toward the right.…”

Section: Methodsmentioning

confidence: 99%

Characterization of weld joints produced by continuous wave and double pulse gas metal arc welding in naval grade high-strength low-alloy steel

Venkateshkannan

Natarajan

Rao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The current research examines gas metal arc welding (GMAW) joints generated in naval grade high-strength low-alloy (HSLA) steel using both continuous wave GMAW (CW-GMAW) and double pulse GMAW (DP-GMAW). The joint was created in four passes with DP-GMAW, whereas CW-GMAW required eight passes. Weld joints were characterized using various techniques, including optical microscopy (OM), scanning electron microscopy (SEM), residual stress analysis, and mechanical evaluation. The mechanical evaluation consisted of microhardness, impact, and tensile tests. The Charpy V-notch (CVN) impact test was performed at room temperature and −60°C. For both CW-GMAW and DP-GMAW, the heat-affected zone and the fusion zone were harder than the base metal. The fracture occurred in the base metal region in all the tensile test specimens containing the weld joints. The DP-GMAW joints showed higher impact toughness at both room temperature and −60°C. In comparison to the fusion zone of the CW-GMAW joint, the fusion zone of the DP-GMAW joint had a greater volume fraction of acicular ferrite, a finer grain size, and a higher percentage of high-angle grain boundaries. These factors have contributed, it is believed, to the higher impact toughness of the DP-GMAW joint.

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“…Chromium was the target material in the X-Ray tube; the incident angle was 35°. Procedure for using this method for measurement of residual stress in weldment is presented in recently published studies; 18,19 the same has formed the basis for the present study. The cross-section of the samples was sliced using WEDM, then the samples was electro-polished using 10% perchloric acid and 90% 2-butoxyethonol as per ASTM E 2860-12 before the measurement.…”

Section: Methodsmentioning

confidence: 99%

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

Kannan

Arivazhagan

Rao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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This paper assesses the metallurgical characteristics and mechanical properties of multi-pass gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW) of micro-alloyed steel DMR 249-A. The prime objective was to carry out a comparative study of the microstructure and mechanical properties of the joints produced by the two types of welding. A high volume of larger sized inclusions in GMAW contributed to inferior mechanical properties. The coarse-grained part of the heat-affected zone (CGHAZ) showed a lower microhardness. Fracture always occurred in the heat-affected zone, and it is believed that it is associated with CGHAZ. GTAW joints showed low tensile residual stress, higher hardness, and tensile strength. GTA weldment also showed superior impact toughness at sub-zero temperature (–60 °C). Mn-containing inclusions were seen in GTA weldments; it is believed that they promote the formation of acicular ferrite. This is believed to be responsible for the superior mechanical properties of GTA weldments. The microstructural analysis of the two weldments revealed the presence of a higher volume fraction of acicular ferrite in the GTAW. All in all, GTAW joint was found to perform better than GMAW joint.

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Effect of Welding Speed on the Prediction Accuracy of Residual Stress in Laser Welded 1.2 mm Thick Dual Phase Steel

Cited by 9 publications

References 24 publications

Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Effect of laser welding on microstructure and mechanical behaviour of dual phase 600 steel sheets

Characterization of weld joints produced by continuous wave and double pulse gas metal arc welding in naval grade high-strength low-alloy steel

Effect of inclusions on microstructure and mechanical behavior of multi-pass welded naval grade steel

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