I believe it's just a corner joint. Sorry, I don't know all my joint names yet. I just set two 3/16" plates against each other to practice. It's nothing I am using for a project.

I have been trying to read and watch as much as I can. Would you guys mind critiquing my attempt at using the little "e" method while pushing the puddle? These types of welds seem to be easier because of the edges for guides, but I am struggling when trying to do small square tubing like 1...