The template should be substituted. Placing {{subst:WikiProject Electrical engineering/Welcome}} on a user's talk page should automatically produce the following:
Hi, and welcome to WikiProject Electrical engineering! We're a group of editors working to improve Wikipedia's coverage of all electrical engineering related articles.
We are just starting, so there are a variety of interesting things to do within the project; feel free to participate as much or as little as you like:
You can use Outline of electrical engineering or Index of electrical engineering articles as a starting point.
Again, welcome! We look forward to seeing you around!
Your signature Current date and time