Effects of the laser parameters on the mechanical properties and microstructure of weld joint in dissimilar pulsed laser welding of AISI 304 and AISI 420

Geng, Yuancheng; Akbari, Mohammad; Karimipour, Arash; Karimi, A.; Soleimani, Aliakbar; Afrand, Masoud

doi:10.1016/j.infrared.2019.103081

Cited by 48 publications

(23 citation statements)

References 23 publications

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“…Conforme a literatura, em situações de alta taxa de resfriamento, como a considerada no presente estudo, a transformação de ferrita para austenita poderia ser suprimida resultando na presença de uma maior quantidade de ferrita residual na zona fundida da solda (CARDOSO, 2012;GNANASEKARAN et al, 2021;GENG et al, 2019;KUDDUS, 2018;CHENITI 2019;PERALTA 2013;LORA, 2006;ASADI et al, 2020;GENG et al, 2019).…”

Section: Resultsunclassified

“…Entretanto, deve-se levar em consideração que a maioria dos metais, incluindo os aços inoxidáveis austeníticos, são submetidos a diversas alterações microestruturais durante o processo de soldagem, em particular a corrosão intergranular (sensitização) caracterizada pela formação de carbonetos de Cromo nos contornos de grão. A formação destes carbonetos deixa regiões vizinhas aos contornos de grão empobrecidas de cromo e susceptíveis a este tipo de deterioração (RISHNAN et al, 2021;GENG et al, 2019;BALRAM et al, 2019a).…”

Section: Introductionunclassified

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Influência Do Aporte De Calor Na Microestrutura Da Zona Fundida Do Aço Inoxidável Austenítico Aisi 301

et al. 2021

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Objetivou-se com esta pesquisa avaliar os efeitos da variação da energia de soldagem na microestrutura da zona fundida do aço inoxidável AISI 301 quantificando a ferrita delta e observando os efeitos desta fase na zona fundida. Para a quantificação da ferrita delta, foi utilizado o software Granulômetro Semi-Automático (GSA). Foram confeccionados cinco corpos de prova, utilizando-se distintos parâmetros de soldagem. O processo de soldagem utilizado foi o Tungsten Inert Gas (TIG). Os resultados mostraram que a energia de soldagem tem grande influência na quantidade de ferrita delta presente na zona fundida e que ocorreu a redução de ferrita delta com o aumento da energia de soldagem.

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Section: Resultsunclassified

Section: Introductionunclassified

Influência Do Aporte De Calor Na Microestrutura Da Zona Fundida Do Aço Inoxidável Austenítico Aisi 301

et al. 2021

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“…The recommendation to solder in one setup is applicable only for attaching the upper and lower plates, as well as the U-shaped insert between them. The efficiency of the use of lasers in welding and related processes (in the processing of the surface layer) is considered in a number of works [5][6][7][8]. In [5], the features of using gas lasers for welding non-ferrous metals are analyzed, in [6] -for welding alloyed, heat-resistant and diffi- Engineering cult-to-machine materials.…”

Section: Introductionmentioning

confidence: 99%

“…In [5], the features of using gas lasers for welding non-ferrous metals are analyzed, in [6] -for welding alloyed, heat-resistant and diffi- Engineering cult-to-machine materials. Work [7] shows the prospects for using pulsed lasers for welding special steels. At the same time, some researchers believe that a higher quality of the formation of permanent joints is provided under conditions of high or low vacuum [8].…”

Section: Introductionmentioning

confidence: 99%

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

et al. 2021

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The results of studying the process of laser vacuum welding of elements of heat-shielding panels made of heat-resistant dispersion-strengthened powder materials Ni-20Cr-6Al-Ti-Y2O3 of increased strength are presented. Such materials can be used to create ultralight heat-shielding panels, which are systems integrated on the surface of aircraft from typical modules of a cellular structure. Technical solutions of heat-insulating modules are considered, which are a cellular (honeycomb) structure consisting of two plates with a thickness of 0.1 to 0.14 mm, inside which there is a thin honeycomb filler. It is shown that the small thickness of the plates and the complexity of integrating the elements into a single system significantly impair the formation of a strong connection of such elements and do not allow the direct use of the known methods of diffusion welding or vacuum brazing. It has been established that laser welding of elements of heat-shielding structures in vacuum provides satisfactory strength of the structure of the heat-shielding element as a whole. Local heating at certain points prevents deformation of the parts to be joined during the welding process. The use of a pulsed Nd:Yag laser with a power of 400–500 W, operating in the frequency range of 50–200 Hz, allows welding with or without a filler powder. It was found that the use of filler additives practically does not affect the mechanical properties of the welded joint, however, it reduces the melt zone, while increasing the density of the welded joint. Based on the results obtained, it was concluded that it is possible to use laser vacuum welding for the integration of thin elements of heat-shielding modules. It is shown that a satisfactory joint strength is achieved by ensuring high cleanliness of the surfaces of elements before welding, maintaining a high vacuum (less than 10–2 Pa) and rational thermal loading of the surfaces of the elements to be integrated. The use of the proposed process makes it possible to obtain a stronger and denser seam in comparison with the known methods of soldering multicomponent powder dispersion-strengthened materials

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“…They performed the welds in low peak power and high welding speeds. Geng et al [11] carried out dissimilar pulsed laser welding of AISI 304 and 420 SS. They researched the effect of laser parameters on the mechanical and microstructural properties of the joints.…”

Section: Introductionmentioning

confidence: 99%

304 Paslanmaz çeliğin mikroyapı ve mekanik özellikleri üzerinde yüksek enerjili lazer kaynak parametrelerinin etkisi

İrizalp¹,

Koroglu²

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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Autogenous bead-on-plate laser welding was performed on 2 mm 304SS materials at different heat inputs. The influence of laser energy in low welding speeds on weld performance using a Nd:YAG laser was studied. The weld performance was characterized in terms of weld bead morphology, microstructure and mechanical properties. The result revealed that the crater increased with the increase of heat input, so there is a linear relationship between crater and heat input. The gradual increase of the heat input was not directly related to the penetration of the weld bead. At the highest heat input, weld beads considerably expanded and also the crater deepened, the hardness increased in these joints while tensile strength and ductility reduced. The best mechanical properties were obtained with high laser energy at intermediate heat input. These weldments exhibited better strength even better than base metal 304SS. The microhardness values were distributed homogeneously from the fusion zone to the base metal. Laser energy increased the ferrite network and brought finer ferrites. As a result, usable laser welding parameters in terms of good strength, as well as good ductility and weld bead morphology were defined for welding 304 SS with 2 mm thickness.

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Effects of the laser parameters on the mechanical properties and microstructure of weld joint in dissimilar pulsed laser welding of AISI 304 and AISI 420

Cited by 48 publications

References 23 publications

Influência Do Aporte De Calor Na Microestrutura Da Zona Fundida Do Aço Inoxidável Austenítico Aisi 301

Influência Do Aporte De Calor Na Microestrutura Da Zona Fundida Do Aço Inoxidável Austenítico Aisi 301

About the possibility of application of laser vacuum welding for the integration of elements of heat-protective structures from powder materials

304 Paslanmaz çeliğin mikroyapı ve mekanik özellikleri üzerinde yüksek enerjili lazer kaynak parametrelerinin etkisi

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