Mechanical vibrations in welding processes

Krajewski, A.

doi:10.1080/09507116.2014.937606

Cited by 9 publications

(6 citation statements)

References 6 publications

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“…The presented results show that the acoustic vibrations input can affect both the geometry of the weld and its face's microstructure. The scale of these changes is not comparable with effects reached in other methods that directly introduce vibrations [1,2,5,10,18,25], but they give the opportunity to reach constant conditions in the welding place using contactless supplying vibration, as in [16,25].…”

Section: Discussionmentioning

confidence: 88%

“…As could be expected, the energy value (amplitude) strongly depended on the vibration phase in the object [2,18] and the obtained results were conditioned by the occurrence of an arrow or vibration node. Therefore, the use of such methods of introducing vibrations whose energy varies with the distance of the source of vibrations from the liquid metal pool does not guarantee repeatable conditions of the technological process [1,2,5,10,12,18].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, increased interest among researchers in finding new ways of improving the structure [ 1 , 2 ] and mechanical properties of welded joints or coatings [ 3 ] applied by welding methods [ 4 , 5 , 6 , 7 ], as well as improving the quality of metal alloys [ 8 , 9 ], can be observed. The issue of improving the micro and macro structural properties can generally be interpreted as improving metallurgical weldability, which has often been a priority [ 10 ]. A careful observer of the literature on the subject will notice that the majority of research in which the authors used mechanical vibrations focuses on the effects obtained, which undoubtedly leads in many cases to the fragmentation of grains [ 11 ], changing their shape into more equiaxial forms [ 12 , 13 ], improving mechanical properties such as strength, impact strength or hardness [ 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

et al. 2020

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The research described in this article presents a new contactless method of introducing mechanical vibrations into the base material during CO2 laser welding of low-carbon steel. The experimental procedure boiled down to subjecting a P235GH steel pipe with a 60 mm diameter, 3.2 mm wall thickness and 500 mm length to acoustic signals with a resonant frequency during the welding process. Acoustic vibrations with a frequency of 1385, 110 and 50 Hz were introduced into the pipe along the axis and transversely from the outer surface. The obtained welds were then subjected to structural tests and Vickers hardness measurements. The results of comparative tests show the impact of such introduced vibrations on the granular structure of the welds, as well as on their microhardness in specific areas, such as the face, penetration depth and the heat-affected zone. The effectiveness of the proposed method of introducing vibrations in the scope of grain size and shape as well as changes in the hardness distribution in the obtained welds is demonstrated.

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Section: Discussionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

et al. 2020

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“…The lower the temperature gradient rate is, the higher the possibility of the formation of equiaxed microstructures. Additionally, vibrations also cause an increase in the amount of undercooling, a shortening of the crystallization time, and the fragmentation of the columnar structure [112][113][114].…”

Section: Ultrasonic Treatmentmentioning

confidence: 99%

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

Yolcu,

Kahraman

2023

Mater. Res. Express

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Joining aluminum alloys with arc welding methods is frequently subject to literature and industrial applications. Although aluminum alloys have different difficulties in the arc welded process, the formation and elimination of solidification cracking defects is a more complex phenomenon. Since avoidance of this defect requires specific approaches and methods, special attempts and improvements have been studied frequently on this subject in recent years. Studies in the literature have clearly shown that this defect, which is often encountered in aluminum alloys, takes place along the grain boundaries. Therefore, the major approach to eliminate this defect is activating nucleation and decreasing the grain size. In this context, modification approaches in the literature, which are frequently used for arc welding of aluminum alloys, have been developed to use three different mechanisms including heterogeneous nucleation, dendrite fragmentation, and grain detachment. While it is aimed to increase heterogeneous nucleation by reinforcing filler metals with compounds in the inoculation approach; dendrite fragmentation and grain detachment are also aimed in the approaches where external effects and forces are used. Within the frame of references, it is also possible to review the external factors aiming to improve weld pool convection and thermal conditions under two headings, which are weld pool stirring and pulsed arc current approaches. The weld pool stirring approach also includes ultrasonic treatment and magnetic arc oscillation methods. In this study, solidification cracking defect that frequently occurs in the arc welding of aluminum alloys is explained fundamentally and the attempts to eliminate this defect are presented as a review paper in a comprehensive manner.

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“…There are many oscillation-involved welding processes, including weld-pool stirring by oscillations of an electromagnetic field or external dipped electrode, ultrasonic agitation of the weld pool via an external transducer, arc oscillations by interchanging electromagnetic field or by oscillating the weld electrode, etc. [1,2,3,4,5,6]. All of these methods have two things in common: (1) The effect on the weld is local, concentrating on vibrating the weld pool as it solidifies with virtually no effect on the surrounding part; (2) these methods require special equipment and cannot be easily implemented with of-the-shelf welding equipment.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Localized Vibration during Welding on the Microstructure and Mechanical Behavior of Steel Welds

et al. 2019

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The use of vibratory welding is treated with some caution in the industry due to inconsistent beneficiary results. Here, a partial explanation is suggested by the differentiation between global vibrational effects (GVEs) and local vibrational effects (LVEs), and the latter is investigated experimentally. Two structural plates of steel are welded at three frequency/amplitude combinations using manual gas metal arc welding in an experimental setup that ensures only LVEs. After welding, tensile tests, microhardness tests, and metallurgical characterization are performed locally in the different welding zones and the results are compared to the non-vibrated welds. Novel use of digital image correlation (DIC) is implemented in tensile testing of welded samples, thus enabling the separate determination of local mechanical properties of the base metal, heat-affected zone and fusion zone of the same weld. LVE is found not to promote any distinct difference in weld properties, at least within the vibrational regimes studied. Nevertheless, depending on geometry and structural response, it is explained how vibratory welding may promote residual stress relief due to GVEs of the welded structure.

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Mechanical vibrations in welding processes

Cited by 9 publications

References 6 publications

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations

How to avoid solidification cracking in arc welding of aluminum alloys: a review on weld metal grain refinement approaches

The Effect of Localized Vibration during Welding on the Microstructure and Mechanical Behavior of Steel Welds

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