Magnetic Pulse Welding: Targeted Manipulation of Weld Seam Formation

Funding: German Research Foundation (DFG)
Project: TE 508/39-3 (SPP 1640 • Teilprojekt A1)
Contact: Dipl.-Wirt.-Ing. Jörn Lueg-Althoff

Within the scope of the project cooperation with the Institute of Manufacturing Science and Engineering at Technische Universität Dresden, different pulse generators and tool coils are used for magnetic pulse welding (MPW) of aluminum tubes and steel cylinders

It can be seen that the minimum radial impact velocities vi,r for otherwise identical experimental configurations strongly depend on the discharge frequency of the applied pulse generator (see figure). The reason for this is a different deformation and collision behavior. Small collision angles which are favorable for the activation of the surfaces to be joined can already be achieved at low discharge frequencies with lower radial impact velocities. During the collision of the joining partners an impact pressure acts with a distinct amplitude and duration. The time integral of this pressure is defined as the pressure deforming pulse I<span font-family:="" times;"="">d </span></sub>and can be used for the comparison of different MPW setups. A specific minimum value <em><span style=" font-family: Times;">I</span></em><span style=" font-family: Times;"></span><sub><span style=" font-family: Times;">d </span></sub>can be identified which must be achieved for a complete weld seam around the circumference of the samples.</p> <p>  </p> <p> <img alt="" src="images/stories/forschung2018/de/Grafik_JLA_DE.png" _cke_saved_src="images/stories/forschung2018/de/Grafik_JLA_DE.png" style="width: 800px; height: 494px; float: left;"></p> <p> Required impact velocity and pressure deforming pulse for welds with different pulse generators</p> <p></p>