Effect of beam deflection oscillations on the weld geometry

Трушников, Д. Н.; Koleva, Elena; Mladenov, G.; Belenkiy, Vladimir

doi:10.1016/j.jmatprotec.2013.03.028

Cited by 22 publications

(8 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of experimental and calculation studies of the weld metal crystallization process in EBW (20Cr3MoWV steel) are presented in Figure 5, which also presents the weld macrostructure (a), the shape of a crystallizing part of the welding bath with crystallite axis projections (b), and the diagram of changes in the macrostructure shape and crystallization scheme (c). The shape and sizes of the crystallizing part were determined by the thermal model (1,2); the crystallite axis projections were determined by the equations (4,5); the diagrams of changes in macrostructure shape and crystallization scheme were based on the calculations of integral crystallization criteria (6)(7)(8)(9)(10)(11).…”

Section: Resultsmentioning

confidence: 99%

“…In some cases, EBW is used at the final stage of manufacturing the products from thermally-hardened materials with a given set of properties, which makes it difficult or impossible to carry out subsequent heat treatment of welded joints. At the same time, welded joint properties must be similar to those of the parent product material [2]. It is important to note that EBW can have the desired effect not only on solid and high-melting alloys but also on thermally hardened materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

et al. 2020

View full text Add to dashboard Cite

The application of electron beam sweep makes it possible to carry out multifocal and multi-beam welding, as well as combine the welding process with local heating or subsequent heat treatment, which is important when preparing products from thermally-hardened materials. This paper presents a method of electron beam welding (EBW) with dynamic beam positioning and its experimental-calculation results regarding the formation of structures and properties of heat-resistant steel welded joints (grade of steel 20Cr3MoWV). The application of electron beam oscillations in welding makes it possible to change the shape and dimensions of welding pool. It also affects the crystallization and formation of a primary structure. It has been established that EBW with dynamic beam positioning increases the weld metal residence time and the thermal effect zone above the critical A3 point, increases cooling time and considerably reduces instantaneous cooling rates as compared to welding without beam sweep. Also, the difference between cooling rates in the depth of a welded joint considerably reduces the degree of structural non-uniformity. A bainitic–martensitic structure is formed in the weld metal and the thermal effect zone throughout the whole depth of fusion. As a result of this structure, the level of mechanical properties of a welded joint produced from EBW with dynamic electron beam positioning approaches that of parent metal to a greater extent than in the case of welding by a static beam. As a consequence, welding of heat-resistant steels reduces the degree of non-uniformity of mechanical properties in the depth of welded joints, as well as decreases the level of hardening of a welded joint in relation to parent metal.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In order to overcome the obstacle, we can apply the methods widely used in technologies of electron beam welding eliminating root defects. These methods are: periodic impacts on a beam [6][7], the choice of optimum focusing [8][9][10], etc.…”

Section: Methodsmentioning

confidence: 99%

Benefits And Prospects Of Laser Welding Application In Vacuum

Letyagin¹,

Трушников²,

Belenkiy³

2016

Kms

Self Cite

View full text Add to dashboard Cite

In the recent years laser beam welding has been more and more broadly used in the industry for the production of details of significant appointment. One of the perspective directions of laser technologies for the production of significant products of big thickness is the welding by the concentrated laser beam in vacuum that allows producing faultless welded seams with the high relation of seam depth to its width. The conducted researches confirm results of theoretical modeling of processes at laser beam welding.

show abstract

“…Deflection oscillations during the process of electron beam welding (EBW) are used to avoid spiking in the root of the weld, as well as the appearance of globules, which tend to form a ridge along the top weld surface at high welding speeds; to standardize the penetration depth; to reduce a significant fraction of the weld porosity; and to create a more appropriate weld structure and mechanical properties of the electron beam welded joints [1]. The beam deflection oscillations change the electron bombardment distribution on the keyhole walls (typically formed during the EBW process), as well as the material and thermal flows in the molten weld pool; as a consequence, the keyhole shape is strongly affected and the weld profile undergoes limited changes [1].…”

Section: Introductionmentioning

confidence: 99%

“…The geometry of the molten and the heat affected zones of special steels, like the high-strength steel (type 15Cr5Mo) considered in this paper, as well as of other metals and alloys obtained after EBW processing, depend strongly on the process parameters: welding speed, electron beam (EB) power, distances from the magnetic lens of the EB gun to the sample surface and to the EB focusing plane [2], the EB emittance and brightness [3], as well as on the way of implementing the EB deflection oscillations -the shape and direction of the oscillations, and their amplitudes and frequencies [1]. The shape and type of the EB deflection oscillations are determined by the coil current deflection law (linear, sinusoidal, etc.).…”

Section: Introductionmentioning

confidence: 99%

Multicriterial optimization strategies for electron beam welding processes

Koleva

Трушников

et al. 2022

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The electron beam welding process is analyzed of high-strength steel type 15Cr5Mo samples with deflection oscillations along the zone of interaction. The geometries of the molten and the heat affected zones are studied in order to investigate the influence of the deflection oscillations parameters and to improve the seam quality. A robust engineering approach is implemented for the case of production conditions considering the errors in the process parameter settings. The problem of quality improvement through fulfilling pre-set technological and quality requirements is solved by scalarization of the vector criteria by implementing a reference point strategy. Other multicriterial optimization strategies are also proposed.

show abstract

Effect of beam deflection oscillations on the weld geometry

Cited by 22 publications

References 8 publications

Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

Application of Dynamic Beam Positioning for Creating Specified Structures and Properties of Welded Joints in Electron-Beam Welding

Benefits And Prospects Of Laser Welding Application In Vacuum

Multicriterial optimization strategies for electron beam welding processes

Contact Info

Product

Resources

About