No. If you are a professional who likes to invent, design, analyze, build and test machines, complex systems, structures and materials to fulfill functional objectives and requirements and make the world a better place to live, than you can definitely join!
All innovation players that support engineering challenges can join.
If you have some technical questions that you can't google or you want advice from someone with more experience, than you can post your question and explain what you are searching for. We will then help you get the answers by either tagging members that can help you or invite external ones to support you.  Some topics that you can find inside are related to materials, manufacturing technologies, design, coatings and of course, you can suggest topics too. We actively search innovators to help other innovators.