Hydemetals (aka Mike Nolte, an Industrial Arts teacher) posted a helpful Instructable on how to make this wave ring. The directions include sawing and soldering instructions. The Instructable was made with and for Hyde Middle School students to help them with metal shop classes. Mr. Nolte seems like the coolest shop teacher ever. Link.
Mr. Nolte’s Hyde Metals web site
HOW TO – Make a Cool Wave Ring