Does anyone know how to disable the welcome email sent after a member confirms their registration?

In your ACP got to Members --> Registration and uncheck the box "Notify on new registrations?"

Thanks, Loren. I'm actually trying to disable the email that's sent to the member after they validate their account. It looks like that setting controls the email sent to the admin to notify of a new member.

 

Okay... what you want is right under that on the same page. Just check the correct option.

"Validation method for new accounts REQUIRED

Email validation 
The user will be sent an email containing a special link they have to click to validate their account.

Administrator validation 
An administrator will need to manually approve the account from the Admin Control Panel.

Email and administrator validation 
The user will be sent an email containing a special link they have to click to validate their account after which an administrator will need to manually approve the account from the Admin Control Panel.

No validation required"