Project background: I am working on a project where i need to weld plastic using ultrasonic transducers.
Problem: Since I'm still learning engineering, I have a hard time figuring out what all the factors are in order to choose the right transducer.
What I've done so far: I have searched the internet to find information regarding this subject, but due to (what seems to me) the wide area of knowledge needed, I haven't found anything that I properly can comprehend.
Basically: What do I need to take into account when choosing a transducer?
Not-so-basically: I suspect that the properties of the material certainly affects the welding process, so here comes a sidequestion: what properties of the material do I need to know in order to calculate/decide which transducer to use?