Weld interface characteristics of copper in collision welding

Niessen, Benedikt; Groche, Peter

doi:10.1063/1.5112582

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…As shown in Figure 4, the size of the weld interface varied across the welding window and dropped from a plateau to almost zero-close to the collision angle boundaries. This is in good agreement with the former investigation for the similar material combinations [9,30]. Joints in this region may not be relevant for industrial application.…”

Section: Discussionsupporting

confidence: 92%

“…However, previous studies revealed that the CoP, which is pushed ahead in the joining gap by the collision front, may prevent bond formation at small collision angles. In fact, the high roughness of the colliding surfaces can cause the CoP to be trapped by the collision front, inhibiting the particles from contacting the virgin base material [21,30,32]. However, since the EDX analysis did not detect any oxides, this is not the reason in the present study.…”

Section: Discussionmentioning

confidence: 57%

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The Energy Balance in Aluminum–Copper High-Speed Collision Welding

Groche

Niessen

2021

JMMP

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Collision welding is a joining technology that is based on the high-speed collision and the resulting plastic deformation of at least one joining partner. The ability to form a high-strength substance-to-substance bond between joining partners of dissimilar metals allows us to design a new generation of joints. However, the occurrence of process-specific phenomena during the high-speed collision, such as a so-called jet or wave formation in the interface, complicates the prediction of bond formation and the resulting bond properties. In this paper, the collision welding of aluminum and copper was investigated at the lower limits of the process. The experiments were performed on a model test rig and observed by high-speed imaging to determine the welding window, which was compared to the ones of similar material parings from former investigation. This allowed to deepen the understanding of the decisive mechanisms at the welding window boundaries. Furthermore, an optical and a scanning electron microscope with energy dispersive X-ray analysis were used to analyze the weld interface. The results showed the important and to date neglected role of the jet and/or the cloud of particles to extract energy from the collision zone, allowing bond formation without melting and intermetallic phases.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 57%

The Energy Balance in Aluminum–Copper High-Speed Collision Welding

Groche

Niessen

2021

JMMP

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Interface Formation during Collision Welding of Aluminum

Niessen

Schumacher

Lueg‐Althoff

et al. 2020

Metals

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Collision welding is a high-speed joining technology based on the plastic deformation of at least one of the joining partners. During the process, several phenomena like the formation of a so-called jet and a cloud of particles occur and enable bond formation. However, the interaction of these phenomena and how they are influenced by the amount of kinetic energy is still unclear. In this paper, the results of three series of experiments with two different setups to determine the influence of the process parameters on the fundamental phenomena and relevant mechanisms of bond formation are presented. The welding processes are monitored by different methods, like high-speed imaging, photonic Doppler velocimetry and light emission measurements. The weld interfaces are analyzed by ultrasonic investigations, metallographic analyses by optical and scanning electron microscopy, and characterized by tensile shear tests. The results provide detailed information on the influence of the different process parameters on the classical welding window and allow a prediction of the different bond mechanisms. They show that during a single magnetic pulse welding process aluminum both fusion-like and solid-state welding can occur. Furthermore, the findings allow predicting the formation of the weld interface with respect to location and shape as well as its mechanical strength.

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Weld interface characteristics of copper in collision welding

Cited by 2 publications

References 8 publications

The Energy Balance in Aluminum–Copper High-Speed Collision Welding

The Energy Balance in Aluminum–Copper High-Speed Collision Welding

Interface Formation during Collision Welding of Aluminum

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