Thermal action of shock-compressed gas on the surface of colliding plates

Ishutkin, S. N.; Kirko, Vladimir I.; Simonov, V. A.

doi:10.1007/bf00741515

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…It is experimentally established that even before collision of welded plates, the metal layers adjacent to the boundary of the joint can be significantly heated to a considerable depth even when welding relatively short plates. The obtained experimental values of the heat input from the shock-compressed gas flow (0.12 MJ/m 2 ) are consistent to those calculated by the techniques from [3,4]. It is shown that the thermal effect of the shock-compressed gas flow ahead of the contact point is nonmonotonic: the surface layers in the heat-affected zone (depending on the distance between them and the boundary of the joint) can undergo both heating and cooling for a few hundred degrees to a depth comparable to the size of the heat-affected zone involved in the plastic deformation.…”

Section: Discussionsupporting

confidence: 86%

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Thermal processes in explosive welding

Khaustov

Kuz’min

Lysak

et al. 2014

Combust Explos Shock Waves

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New computational and experimental methods for studying the thermal processes occurring during metal explosive welding are developed based on the use of natural and local thermocouples and allowing one to reliably construct temperature fields in the heat-affected zone and thermal welding cycles. The basic regularities of thermal processes in the heat-affected zone during explosive welding are revealed. It is theoretically shown and experimentally confirmed that, in this zone, the heat released during detonation of the explosive can significantly increase the temperature of the contacting metal layers and lead to melting of the latter.

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Section: Discussionsupporting

confidence: 86%

“…Heating of the colliding surfaces by shockcompressed gas flow ahead of the contact point [1][2][3][4]. The temperature of the shock-compressed gas can reach a Volgograd State Technical University, Volgograd, 400005 Russia; weld@vstu.ru.…”

Section: Introductionmentioning

confidence: 99%

Thermal processes in explosive welding

Khaustov

Kuz’min

Lysak

et al. 2014

Combust Explos Shock Waves

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“…However, as shown in the first experiments, MPW is also possible at lower impact velocities where jetting and material flow are not initiated. To explain these findings, the mechanism presented by Deribas [6] and Ishutkin [5] seems to be a reasonable approach. They identified the appearance of a "cloud of particles" (CoP) at lower impact velocities.…”

Section: Effect Of the Flyer Kinetics On The Materials Flowmentioning

confidence: 99%

“…Within the last decades, the influence of thermal aspects during solid state welding was brought into the focus of many researchers, aiming for the identification of the relevant joining mechanism(s). For example, Ishutkin et al found for EXW that the temperature of the shock compressed gas in the joining gap reaches several thousand • C and causes surface melting of both joining partners [5]. Together with the prevalent pressure, the overall energy input might be beyond the upper welding boundary and result in bad weld quality due to heat accumulation at the interface.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, different theories exist about the most relevant source of the thermal energy. In [9,15], the thermal energy is related to the plastic deformation during the collision, while in [5,16] it is attributed to the shock compressed gas in the joining gap as well. Successful MPW experiments under vacuum conditions revealed that no initial gas is required in the joining gap.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Effects in Dissimilar Magnetic Pulse Welding

Bellmann

Lueg‐Althoff

Schulze

et al. 2019

Metals

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Magnetic pulse welding (MPW) is often categorized as a cold welding technology, whereas latest studies evidence melted and rapidly cooled regions within the joining interface. These phenomena already occur at very low impact velocities, when the heat input due to plastic deformation is comparatively low and where jetting in the kind of a distinct material flow is not initiated. As another heat source, this study investigates the cloud of particles (CoP), which is ejected as a result of the high speed impact. MPW experiments with different collision conditions are carried out in vacuum to suppress the interaction with the surrounding air for an improved process monitoring. Long time exposures and flash measurements indicate a higher temperature in the joining gap for smaller collision angles. Furthermore, the CoP becomes a finely dispersed metal vapor because of the higher degree of compression and the increased temperature. These conditions are beneficial for the surface activation of both joining partners. A numerical temperature model based on the theory of liquid state bonding is developed and considers the heating due to the CoP as well as the enthalpy of fusion and crystallization, respectively. The time offset between the heat input and the contact is identified as an important factor for a successful weld formation. Low values are beneficial to ensure high surface temperatures at the time of contact, which corresponds to the experimental results at small collision angles.

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Possibility of identification of shock-wave processes

Kuznetsov¹

1988

Combust Explos Shock Waves

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Thermal action of shock-compressed gas on the surface of colliding plates

Cited by 15 publications

References 2 publications

Thermal processes in explosive welding

Thermal processes in explosive welding

Thermal Effects in Dissimilar Magnetic Pulse Welding

Possibility of identification of shock-wave processes

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