Ultrasonic welding Laboratory at LKT-2023/24

MMT Laboratory work (4 CP)

The Lab is limited to a maximum of 12 students.

Schedule:

(All dates can be adjusted if there is a time conflict with MMT lectures)

13.01.23 - report submission

TBD - A report feedback session might be scheduled after submission, to give you some advice for the next reports you will be writing during the MMT program.

The event will be held in groups of 2-3 students and it is divided into 3 parts. First, the students give an oral presentation on the ultrasonic polymer welding procedure (USW). A presentation duration of 10-15 minutes is expected, in which the students present basic knowledge of the procedure. The knowledge should be researched in advance with an indication of the sources. In the presentation at least the following question should be answered:

·         Brief introduction: What is polymer ultrasonic welding?

·         Where is polymer (plastics) ultrasonic welding used? (Name example applications for USW)

·         How does ultrasonic welding work? (Explain technical background and functionality)

·         What are the advantages of USW?

·         Which materials (plastics) can be welded/used in USW.

·         What is the state of the art?

·         Process parameter

.         Recommended component geometries for proper weld.

In the second part, practical tests are carried out with an ultrasonic welding machine. Students receive detailed safety instruction for the machine. Afterwards, the students carry out independent welding tests with varying process parameters on existing plastic test specimens. Tensile tests are used to examine the achieved joining strength of the welds.

Finally, the students have to submit a written report of the experiments and a discussion of the results. In doing so, the students should deal with the influence of the process parameters in ultrasonic welding and give feedback about their experiments in the laboratory work.