The most obvious reason is that you have delayed the welcome emails from being sent straight away.  In this case they will be kept until you send them manually at Admin > Settings > Email (dropdown) > delayed emails.  Check the emails in the bottom list that you want to send and click submit.  This will send them into the middle section where you will need to check the send option and click submit.  This will send the chosen emails to their destination.

Alternatively the emails we are sending to you may be being caught in a spam filter.  Add our domain - ewassist.co.uk to your safe/white lists.