Impact of mechanical vibrations introduced by up blasting on the structure and hardness of welds on P235GH steel during MAG welding process

Krajewski, A.; Kołodziejczak, Paweł; Wang, Xiaoming

doi:10.26628/wtr.v91i12.1079

Cited by 3 publications

(5 citation statements)

References 12 publications

(5 reference statements)

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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: 87%

“…The application of mechanical vibrations during welding processes shows that satisfactory results can be achieved without the need for direct and reliable attachment of the vibrating system to the base material [2,12,18,25]. Vibrations can be introduced, for example, by means of laser beam pulses [3,17], controlled modulation of the electric arc or impact methods using mass collision energy transfer [6,25]. An interesting technical solution was used by researchers [26] during TIG welding of aluminum alloys.…”

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: 87%

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…It is also worth dealing with the aspect of precise determination of vibration parameters and methods of their introduction so as to become independent of the variable distance of the welding heat source from the vibration source. In the near future, special emphasis will be placed on the research being a continuation of the work [16,19], while in the long term it is planned to support the coating application processes with mechanical vibrations.…”

Section: Discussionmentioning

confidence: 99%

“…Research related to the application of mechanical vibrations during welding processes shows that it is possible to achieve satisfactory results without the need to directly and securely attach the vibrating system to the base material. Vibrations can be introduced, for example, by means of pulses of a laser beam [18], controlled electric arc modulation [16] or impact methods using the transfer of mass collision energy [19]. One of such methods is described in [19].…”

Section: Laser Beam Remelting With the Support Of Acoustic Vibrationsmentioning

confidence: 99%

“…This method is easy to apply in practice, as shot blasting machines are commonly used devices in the metal industry. Therefore, a MAG surfacing experiment was planned and carried out on a P235GH steel pipe with a diameter of 89 mm, a wall thickness of 3.2 mm and a length of 2000 mm with the participation of vibrations generated by steel shot [16]. The surfacing tests were carried out in a downhand position parallel to the pipe axis (Fig.…”

Section: Mag Surfacing With the Introduction Of Stochastic Vibrationsmentioning

confidence: 99%

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Support with mechanical vibrations of welding processes review of own research

et al. 2021

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The article discusses the most important original achievements in the use of high-power mechanical vibrations with low and ultrasonic frequency in various welding processes such as MIG, MAG, TIG, RW, LW, diffusion welding and brazing in relation to various basic materials such as structural steel and aluminum alloys. Mechanical vibrations were introduced by means of ultrasonic vibrating systems and using the shot-blasting process, as well as acoustic influence. As part of the comparative research, the structure and hardness analysis of HV0.1 was presented. The obtained results indicate that both low-frequency and ultrasonic frequency vibrations significantly change the properties of the resulting structures affected by mechanical vibrations. The scale of these changes varies depending on the frequency and parameters specific to each of the welding processes used. The obtained results allow us to conclude that the skillful application of mechanical vibrations accompanying welding processes can contribute to the reduction of grain sizes, to change the depth or width of penetration and to lowering hardness in the sensitive heat affected zone area.

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Analysis of the Impact of Acoustic Vibrations on the Laser Beam Remelting Process

Krajewski

Kołodziejczak

2022

Materials

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The article contains an analysis of selected aspects of the structure and properties of laser remelting of low carbon steel supported by acoustic vibrations obtained in the research presented in (A Novel Method of Supporting the Laser Welding Process with Mechanical Acoustic Vibrations). Due to the assumptions made in this publication, it was necessary to deepen the analysis of the obtained results. The correlation of such factors on the structure as the frequency of vibrations (50, 100, 1385 Hz), their propagation through the short-lived liquid phase and changes in the structure, chemical composition, and hardness of the characteristic zones of the obtained remelting was considered. The remelting obtained with the participation of resonant acoustic vibrations with a frequency of 1385 Hz was subjected to thermo-mechanical analysis. A characteristic “bandwidth” pattern was revealed in the structure. In the present article, a thermo-mechanical analysis of the cause of its formation was carried out by comparing it with the remelting obtained at lower frequencies. As a result of the analysis, it was found that the band structure was characterized by 7 to 8 areas up to approximately a 90 µm depth, which showed dark and light zones. These areas differed in carbon content, hardness, and width. The analysis of vibration propagation helped to determine that in the time of crystallization of the molten metal pool, the transition of the vibration wave lasted through 7–8 minima and maxima. This fact allows us to assume with a high probability that it is the result of the applied resonance frequency.

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Impact of mechanical vibrations introduced by up blasting on the structure and hardness of welds on P235GH steel during MAG welding process

Cited by 3 publications

References 12 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

Support with mechanical vibrations of welding processes review of own research

Analysis of the Impact of Acoustic Vibrations on the Laser Beam Remelting Process

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